62e532fb82ad4a4230094becb2fa676a1a9b9d78
[linux-3.10.git] / drivers / usb / core / devio.c
1 /*****************************************************************************/
2
3 /*
4  *      devio.c  --  User space communication with USB devices.
5  *
6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
7  *
8  *      This program is free software; you can redistribute it and/or modify
9  *      it under the terms of the GNU General Public License as published by
10  *      the Free Software Foundation; either version 2 of the License, or
11  *      (at your option) any later version.
12  *
13  *      This program is distributed in the hope that it will be useful,
14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *      GNU General Public License for more details.
17  *
18  *      You should have received a copy of the GNU General Public License
19  *      along with this program; if not, write to the Free Software
20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  *
22  *  This file implements the usbfs/x/y files, where
23  *  x is the bus number and y the device number.
24  *
25  *  It allows user space programs/"drivers" to communicate directly
26  *  with USB devices without intervening kernel driver.
27  *
28  *  Revision history
29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
30  *    04.01.2000   0.2   Turned into its own filesystem
31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
32  *                       (CAN-2005-3055)
33  */
34
35 /*****************************************************************************/
36
37 #include <linux/fs.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/signal.h>
41 #include <linux/poll.h>
42 #include <linux/module.h>
43 #include <linux/string.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/usb/hcd.h>      /* for usbcore internals */
47 #include <linux/cdev.h>
48 #include <linux/notifier.h>
49 #include <linux/security.h>
50 #include <linux/user_namespace.h>
51 #include <linux/scatterlist.h>
52 #include <asm/uaccess.h>
53 #include <asm/byteorder.h>
54 #include <linux/moduleparam.h>
55
56 #include "usb.h"
57
58 #define USB_MAXBUS                      64
59 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
60 #define USB_SG_SIZE                     16384 /* split-size for large txs */
61
62 /* Mutual exclusion for removal, open, and release */
63 DEFINE_MUTEX(usbfs_mutex);
64
65 struct dev_state {
66         struct list_head list;      /* state list */
67         struct usb_device *dev;
68         struct file *file;
69         spinlock_t lock;            /* protects the async urb lists */
70         struct list_head async_pending;
71         struct list_head async_completed;
72         wait_queue_head_t wait;     /* wake up if a request completed */
73         unsigned int discsignr;
74         struct pid *disc_pid;
75         const struct cred *cred;
76         void __user *disccontext;
77         unsigned long ifclaimed;
78         u32 secid;
79         u32 disabled_bulk_eps;
80 };
81
82 struct async {
83         struct list_head asynclist;
84         struct dev_state *ps;
85         struct pid *pid;
86         const struct cred *cred;
87         unsigned int signr;
88         unsigned int ifnum;
89         void __user *userbuffer;
90         void __user *userurb;
91         struct urb *urb;
92         unsigned int mem_usage;
93         int status;
94         u32 secid;
95         u8 bulk_addr;
96         u8 bulk_status;
97 };
98
99 static bool usbfs_snoop;
100 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
101 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
102
103 #define snoop(dev, format, arg...)                              \
104         do {                                                    \
105                 if (usbfs_snoop)                                \
106                         dev_info(dev , format , ## arg);        \
107         } while (0)
108
109 enum snoop_when {
110         SUBMIT, COMPLETE
111 };
112
113 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
114
115 /* Limit on the total amount of memory we can allocate for transfers */
116 static unsigned usbfs_memory_mb = 16;
117 module_param(usbfs_memory_mb, uint, 0644);
118 MODULE_PARM_DESC(usbfs_memory_mb,
119                 "maximum MB allowed for usbfs buffers (0 = no limit)");
120
121 /* Hard limit, necessary to avoid aithmetic overflow */
122 #define USBFS_XFER_MAX          (UINT_MAX / 2 - 1000000)
123
124 static atomic_t usbfs_memory_usage;     /* Total memory currently allocated */
125
126 /* Check whether it's okay to allocate more memory for a transfer */
127 static int usbfs_increase_memory_usage(unsigned amount)
128 {
129         unsigned lim;
130
131         /*
132          * Convert usbfs_memory_mb to bytes, avoiding overflows.
133          * 0 means use the hard limit (effectively unlimited).
134          */
135         lim = ACCESS_ONCE(usbfs_memory_mb);
136         if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
137                 lim = USBFS_XFER_MAX;
138         else
139                 lim <<= 20;
140
141         atomic_add(amount, &usbfs_memory_usage);
142         if (atomic_read(&usbfs_memory_usage) <= lim)
143                 return 0;
144         atomic_sub(amount, &usbfs_memory_usage);
145         return -ENOMEM;
146 }
147
148 /* Memory for a transfer is being deallocated */
149 static void usbfs_decrease_memory_usage(unsigned amount)
150 {
151         atomic_sub(amount, &usbfs_memory_usage);
152 }
153
154 static int connected(struct dev_state *ps)
155 {
156         return (!list_empty(&ps->list) &&
157                         ps->dev->state != USB_STATE_NOTATTACHED);
158 }
159
160 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
161 {
162         loff_t ret;
163
164         mutex_lock(&file_inode(file)->i_mutex);
165
166         switch (orig) {
167         case 0:
168                 file->f_pos = offset;
169                 ret = file->f_pos;
170                 break;
171         case 1:
172                 file->f_pos += offset;
173                 ret = file->f_pos;
174                 break;
175         case 2:
176         default:
177                 ret = -EINVAL;
178         }
179
180         mutex_unlock(&file_inode(file)->i_mutex);
181         return ret;
182 }
183
184 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
185                            loff_t *ppos)
186 {
187         struct dev_state *ps = file->private_data;
188         struct usb_device *dev = ps->dev;
189         ssize_t ret = 0;
190         unsigned len;
191         loff_t pos;
192         int i;
193
194         pos = *ppos;
195         usb_lock_device(dev);
196         if (!connected(ps)) {
197                 ret = -ENODEV;
198                 goto err;
199         } else if (pos < 0) {
200                 ret = -EINVAL;
201                 goto err;
202         }
203
204         if (pos < sizeof(struct usb_device_descriptor)) {
205                 /* 18 bytes - fits on the stack */
206                 struct usb_device_descriptor temp_desc;
207
208                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
209                 le16_to_cpus(&temp_desc.bcdUSB);
210                 le16_to_cpus(&temp_desc.idVendor);
211                 le16_to_cpus(&temp_desc.idProduct);
212                 le16_to_cpus(&temp_desc.bcdDevice);
213
214                 len = sizeof(struct usb_device_descriptor) - pos;
215                 if (len > nbytes)
216                         len = nbytes;
217                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
218                         ret = -EFAULT;
219                         goto err;
220                 }
221
222                 *ppos += len;
223                 buf += len;
224                 nbytes -= len;
225                 ret += len;
226         }
227
228         pos = sizeof(struct usb_device_descriptor);
229         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
230                 struct usb_config_descriptor *config =
231                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
232                 unsigned int length = le16_to_cpu(config->wTotalLength);
233
234                 if (*ppos < pos + length) {
235
236                         /* The descriptor may claim to be longer than it
237                          * really is.  Here is the actual allocated length. */
238                         unsigned alloclen =
239                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
240
241                         len = length - (*ppos - pos);
242                         if (len > nbytes)
243                                 len = nbytes;
244
245                         /* Simply don't write (skip over) unallocated parts */
246                         if (alloclen > (*ppos - pos)) {
247                                 alloclen -= (*ppos - pos);
248                                 if (copy_to_user(buf,
249                                     dev->rawdescriptors[i] + (*ppos - pos),
250                                     min(len, alloclen))) {
251                                         ret = -EFAULT;
252                                         goto err;
253                                 }
254                         }
255
256                         *ppos += len;
257                         buf += len;
258                         nbytes -= len;
259                         ret += len;
260                 }
261
262                 pos += length;
263         }
264
265 err:
266         usb_unlock_device(dev);
267         return ret;
268 }
269
270 /*
271  * async list handling
272  */
273
274 static struct async *alloc_async(unsigned int numisoframes)
275 {
276         struct async *as;
277
278         as = kzalloc(sizeof(struct async), GFP_KERNEL);
279         if (!as)
280                 return NULL;
281         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
282         if (!as->urb) {
283                 kfree(as);
284                 return NULL;
285         }
286         return as;
287 }
288
289 static void free_async(struct async *as)
290 {
291         int i;
292
293         put_pid(as->pid);
294         if (as->cred)
295                 put_cred(as->cred);
296         for (i = 0; i < as->urb->num_sgs; i++) {
297                 if (sg_page(&as->urb->sg[i]))
298                         kfree(sg_virt(&as->urb->sg[i]));
299         }
300         kfree(as->urb->sg);
301         kfree(as->urb->transfer_buffer);
302         kfree(as->urb->setup_packet);
303         usb_free_urb(as->urb);
304         usbfs_decrease_memory_usage(as->mem_usage);
305         kfree(as);
306 }
307
308 static void async_newpending(struct async *as)
309 {
310         struct dev_state *ps = as->ps;
311         unsigned long flags;
312
313         spin_lock_irqsave(&ps->lock, flags);
314         list_add_tail(&as->asynclist, &ps->async_pending);
315         spin_unlock_irqrestore(&ps->lock, flags);
316 }
317
318 static void async_removepending(struct async *as)
319 {
320         struct dev_state *ps = as->ps;
321         unsigned long flags;
322
323         spin_lock_irqsave(&ps->lock, flags);
324         list_del_init(&as->asynclist);
325         spin_unlock_irqrestore(&ps->lock, flags);
326 }
327
328 static struct async *async_getcompleted(struct dev_state *ps)
329 {
330         unsigned long flags;
331         struct async *as = NULL;
332
333         spin_lock_irqsave(&ps->lock, flags);
334         if (!list_empty(&ps->async_completed)) {
335                 as = list_entry(ps->async_completed.next, struct async,
336                                 asynclist);
337                 list_del_init(&as->asynclist);
338         }
339         spin_unlock_irqrestore(&ps->lock, flags);
340         return as;
341 }
342
343 static struct async *async_getpending(struct dev_state *ps,
344                                              void __user *userurb)
345 {
346         struct async *as;
347
348         list_for_each_entry(as, &ps->async_pending, asynclist)
349                 if (as->userurb == userurb) {
350                         list_del_init(&as->asynclist);
351                         return as;
352                 }
353
354         return NULL;
355 }
356
357 static void snoop_urb(struct usb_device *udev,
358                 void __user *userurb, int pipe, unsigned length,
359                 int timeout_or_status, enum snoop_when when,
360                 unsigned char *data, unsigned data_len)
361 {
362         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
363         static const char *dirs[] = {"out", "in"};
364         int ep;
365         const char *t, *d;
366
367         if (!usbfs_snoop)
368                 return;
369
370         ep = usb_pipeendpoint(pipe);
371         t = types[usb_pipetype(pipe)];
372         d = dirs[!!usb_pipein(pipe)];
373
374         if (userurb) {          /* Async */
375                 if (when == SUBMIT)
376                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
377                                         "length %u\n",
378                                         userurb, ep, t, d, length);
379                 else
380                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
381                                         "actual_length %u status %d\n",
382                                         userurb, ep, t, d, length,
383                                         timeout_or_status);
384         } else {
385                 if (when == SUBMIT)
386                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
387                                         "timeout %d\n",
388                                         ep, t, d, length, timeout_or_status);
389                 else
390                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
391                                         "status %d\n",
392                                         ep, t, d, length, timeout_or_status);
393         }
394
395         if (data && data_len > 0) {
396                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
397                         data, data_len, 1);
398         }
399 }
400
401 static void snoop_urb_data(struct urb *urb, unsigned len)
402 {
403         int i, size;
404
405         if (!usbfs_snoop)
406                 return;
407
408         if (urb->num_sgs == 0) {
409                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
410                         urb->transfer_buffer, len, 1);
411                 return;
412         }
413
414         for (i = 0; i < urb->num_sgs && len; i++) {
415                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
416                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
417                         sg_virt(&urb->sg[i]), size, 1);
418                 len -= size;
419         }
420 }
421
422 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
423 {
424         unsigned i, len, size;
425
426         if (urb->number_of_packets > 0)         /* Isochronous */
427                 len = urb->transfer_buffer_length;
428         else                                    /* Non-Isoc */
429                 len = urb->actual_length;
430
431         if (urb->num_sgs == 0) {
432                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
433                         return -EFAULT;
434                 return 0;
435         }
436
437         for (i = 0; i < urb->num_sgs && len; i++) {
438                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
439                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
440                         return -EFAULT;
441                 userbuffer += size;
442                 len -= size;
443         }
444
445         return 0;
446 }
447
448 #define AS_CONTINUATION 1
449 #define AS_UNLINK       2
450
451 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
452 __releases(ps->lock)
453 __acquires(ps->lock)
454 {
455         struct urb *urb;
456         struct async *as;
457
458         /* Mark all the pending URBs that match bulk_addr, up to but not
459          * including the first one without AS_CONTINUATION.  If such an
460          * URB is encountered then a new transfer has already started so
461          * the endpoint doesn't need to be disabled; otherwise it does.
462          */
463         list_for_each_entry(as, &ps->async_pending, asynclist) {
464                 if (as->bulk_addr == bulk_addr) {
465                         if (as->bulk_status != AS_CONTINUATION)
466                                 goto rescan;
467                         as->bulk_status = AS_UNLINK;
468                         as->bulk_addr = 0;
469                 }
470         }
471         ps->disabled_bulk_eps |= (1 << bulk_addr);
472
473         /* Now carefully unlink all the marked pending URBs */
474  rescan:
475         list_for_each_entry(as, &ps->async_pending, asynclist) {
476                 if (as->bulk_status == AS_UNLINK) {
477                         as->bulk_status = 0;            /* Only once */
478                         urb = as->urb;
479                         usb_get_urb(urb);
480                         spin_unlock(&ps->lock);         /* Allow completions */
481                         usb_unlink_urb(urb);
482                         usb_put_urb(urb);
483                         spin_lock(&ps->lock);
484                         goto rescan;
485                 }
486         }
487 }
488
489 static void async_completed(struct urb *urb)
490 {
491         struct async *as = urb->context;
492         struct dev_state *ps = as->ps;
493         struct siginfo sinfo;
494         struct pid *pid = NULL;
495         u32 secid = 0;
496         const struct cred *cred = NULL;
497         int signr;
498
499         spin_lock(&ps->lock);
500         list_move_tail(&as->asynclist, &ps->async_completed);
501         as->status = urb->status;
502         signr = as->signr;
503         if (signr) {
504                 memset(&sinfo, 0, sizeof(sinfo));
505                 sinfo.si_signo = as->signr;
506                 sinfo.si_errno = as->status;
507                 sinfo.si_code = SI_ASYNCIO;
508                 sinfo.si_addr = as->userurb;
509                 pid = get_pid(as->pid);
510                 cred = get_cred(as->cred);
511                 secid = as->secid;
512         }
513         snoop(&urb->dev->dev, "urb complete\n");
514         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
515                         as->status, COMPLETE, NULL, 0);
516         if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
517                 snoop_urb_data(urb, urb->actual_length);
518
519         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
520                         as->status != -ENOENT)
521                 cancel_bulk_urbs(ps, as->bulk_addr);
522         spin_unlock(&ps->lock);
523
524         if (signr) {
525                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
526                 put_pid(pid);
527                 put_cred(cred);
528         }
529
530         wake_up(&ps->wait);
531 }
532
533 static void destroy_async(struct dev_state *ps, struct list_head *list)
534 {
535         struct urb *urb;
536         struct async *as;
537         unsigned long flags;
538
539         spin_lock_irqsave(&ps->lock, flags);
540         while (!list_empty(list)) {
541                 as = list_entry(list->next, struct async, asynclist);
542                 list_del_init(&as->asynclist);
543                 urb = as->urb;
544                 usb_get_urb(urb);
545
546                 /* drop the spinlock so the completion handler can run */
547                 spin_unlock_irqrestore(&ps->lock, flags);
548                 usb_kill_urb(urb);
549                 usb_put_urb(urb);
550                 spin_lock_irqsave(&ps->lock, flags);
551         }
552         spin_unlock_irqrestore(&ps->lock, flags);
553 }
554
555 static void destroy_async_on_interface(struct dev_state *ps,
556                                        unsigned int ifnum)
557 {
558         struct list_head *p, *q, hitlist;
559         unsigned long flags;
560
561         INIT_LIST_HEAD(&hitlist);
562         spin_lock_irqsave(&ps->lock, flags);
563         list_for_each_safe(p, q, &ps->async_pending)
564                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
565                         list_move_tail(p, &hitlist);
566         spin_unlock_irqrestore(&ps->lock, flags);
567         destroy_async(ps, &hitlist);
568 }
569
570 static void destroy_all_async(struct dev_state *ps)
571 {
572         destroy_async(ps, &ps->async_pending);
573 }
574
575 /*
576  * interface claims are made only at the request of user level code,
577  * which can also release them (explicitly or by closing files).
578  * they're also undone when devices disconnect.
579  */
580
581 static int driver_probe(struct usb_interface *intf,
582                         const struct usb_device_id *id)
583 {
584         return -ENODEV;
585 }
586
587 static void driver_disconnect(struct usb_interface *intf)
588 {
589         struct dev_state *ps = usb_get_intfdata(intf);
590         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
591
592         if (!ps)
593                 return;
594
595         /* NOTE:  this relies on usbcore having canceled and completed
596          * all pending I/O requests; 2.6 does that.
597          */
598
599         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
600                 clear_bit(ifnum, &ps->ifclaimed);
601         else
602                 dev_warn(&intf->dev, "interface number %u out of range\n",
603                          ifnum);
604
605         usb_set_intfdata(intf, NULL);
606
607         /* force async requests to complete */
608         destroy_async_on_interface(ps, ifnum);
609 }
610
611 /* The following routines are merely placeholders.  There is no way
612  * to inform a user task about suspend or resumes.
613  */
614 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
615 {
616         return 0;
617 }
618
619 static int driver_resume(struct usb_interface *intf)
620 {
621         return 0;
622 }
623
624 struct usb_driver usbfs_driver = {
625         .name =         "usbfs",
626         .probe =        driver_probe,
627         .disconnect =   driver_disconnect,
628         .suspend =      driver_suspend,
629         .resume =       driver_resume,
630 };
631
632 static int claimintf(struct dev_state *ps, unsigned int ifnum)
633 {
634         struct usb_device *dev = ps->dev;
635         struct usb_interface *intf;
636         int err;
637
638         if (ifnum >= 8*sizeof(ps->ifclaimed))
639                 return -EINVAL;
640         /* already claimed */
641         if (test_bit(ifnum, &ps->ifclaimed))
642                 return 0;
643
644         intf = usb_ifnum_to_if(dev, ifnum);
645         if (!intf)
646                 err = -ENOENT;
647         else
648                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
649         if (err == 0)
650                 set_bit(ifnum, &ps->ifclaimed);
651         return err;
652 }
653
654 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
655 {
656         struct usb_device *dev;
657         struct usb_interface *intf;
658         int err;
659
660         err = -EINVAL;
661         if (ifnum >= 8*sizeof(ps->ifclaimed))
662                 return err;
663         dev = ps->dev;
664         intf = usb_ifnum_to_if(dev, ifnum);
665         if (!intf)
666                 err = -ENOENT;
667         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
668                 usb_driver_release_interface(&usbfs_driver, intf);
669                 err = 0;
670         }
671         return err;
672 }
673
674 static int checkintf(struct dev_state *ps, unsigned int ifnum)
675 {
676         if (ps->dev->state != USB_STATE_CONFIGURED)
677                 return -EHOSTUNREACH;
678         if (ifnum >= 8*sizeof(ps->ifclaimed))
679                 return -EINVAL;
680         if (test_bit(ifnum, &ps->ifclaimed))
681                 return 0;
682         /* if not yet claimed, claim it for the driver */
683         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
684                  "interface %u before use\n", task_pid_nr(current),
685                  current->comm, ifnum);
686         return claimintf(ps, ifnum);
687 }
688
689 static int findintfep(struct usb_device *dev, unsigned int ep)
690 {
691         unsigned int i, j, e;
692         struct usb_interface *intf;
693         struct usb_host_interface *alts;
694         struct usb_endpoint_descriptor *endpt;
695
696         if (ep & ~(USB_DIR_IN|0xf))
697                 return -EINVAL;
698         if (!dev->actconfig)
699                 return -ESRCH;
700         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
701                 intf = dev->actconfig->interface[i];
702                 for (j = 0; j < intf->num_altsetting; j++) {
703                         alts = &intf->altsetting[j];
704                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
705                                 endpt = &alts->endpoint[e].desc;
706                                 if (endpt->bEndpointAddress == ep)
707                                         return alts->desc.bInterfaceNumber;
708                         }
709                 }
710         }
711         return -ENOENT;
712 }
713
714 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
715                            unsigned int request, unsigned int index)
716 {
717         int ret = 0;
718         struct usb_host_interface *alt_setting;
719
720         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
721          && ps->dev->state != USB_STATE_ADDRESS
722          && ps->dev->state != USB_STATE_CONFIGURED)
723                 return -EHOSTUNREACH;
724         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
725                 return 0;
726
727         /*
728          * check for the special corner case 'get_device_id' in the printer
729          * class specification, where wIndex is (interface << 8 | altsetting)
730          * instead of just interface
731          */
732         if (requesttype == 0xa1 && request == 0) {
733                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
734                                                    index >> 8, index & 0xff);
735                 if (alt_setting
736                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
737                         index >>= 8;
738         }
739
740         index &= 0xff;
741         switch (requesttype & USB_RECIP_MASK) {
742         case USB_RECIP_ENDPOINT:
743                 if ((index & ~USB_DIR_IN) == 0)
744                         return 0;
745                 ret = findintfep(ps->dev, index);
746                 if (ret < 0) {
747                         /*
748                          * Some not fully compliant Win apps seem to get
749                          * index wrong and have the endpoint number here
750                          * rather than the endpoint address (with the
751                          * correct direction). Win does let this through,
752                          * so we'll not reject it here but leave it to
753                          * the device to not break KVM. But we warn.
754                          */
755                         ret = findintfep(ps->dev, index ^ 0x80);
756                         if (ret >= 0)
757                                 dev_info(&ps->dev->dev,
758                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
759                                         __func__, task_pid_nr(current),
760                                         current->comm, index, index ^ 0x80);
761                 }
762                 if (ret >= 0)
763                         ret = checkintf(ps, ret);
764                 break;
765
766         case USB_RECIP_INTERFACE:
767                 ret = checkintf(ps, index);
768                 break;
769         }
770         return ret;
771 }
772
773 static int match_devt(struct device *dev, void *data)
774 {
775         return dev->devt == (dev_t) (unsigned long) data;
776 }
777
778 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
779 {
780         struct device *dev;
781
782         dev = bus_find_device(&usb_bus_type, NULL,
783                               (void *) (unsigned long) devt, match_devt);
784         if (!dev)
785                 return NULL;
786         return container_of(dev, struct usb_device, dev);
787 }
788
789 /*
790  * file operations
791  */
792 static int usbdev_open(struct inode *inode, struct file *file)
793 {
794         struct usb_device *dev = NULL;
795         struct dev_state *ps;
796         int ret;
797
798         ret = -ENOMEM;
799         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
800         if (!ps)
801                 goto out_free_ps;
802
803         ret = -ENODEV;
804
805         /* Protect against simultaneous removal or release */
806         mutex_lock(&usbfs_mutex);
807
808         /* usbdev device-node */
809         if (imajor(inode) == USB_DEVICE_MAJOR)
810                 dev = usbdev_lookup_by_devt(inode->i_rdev);
811
812         mutex_unlock(&usbfs_mutex);
813
814         if (!dev)
815                 goto out_free_ps;
816
817         usb_lock_device(dev);
818         if (dev->state == USB_STATE_NOTATTACHED)
819                 goto out_unlock_device;
820
821         ret = usb_autoresume_device(dev);
822         if (ret)
823                 goto out_unlock_device;
824
825         ps->dev = dev;
826         ps->file = file;
827         spin_lock_init(&ps->lock);
828         INIT_LIST_HEAD(&ps->list);
829         INIT_LIST_HEAD(&ps->async_pending);
830         INIT_LIST_HEAD(&ps->async_completed);
831         init_waitqueue_head(&ps->wait);
832         ps->discsignr = 0;
833         ps->disc_pid = get_pid(task_pid(current));
834         ps->cred = get_current_cred();
835         ps->disccontext = NULL;
836         ps->ifclaimed = 0;
837         security_task_getsecid(current, &ps->secid);
838         smp_wmb();
839         list_add_tail(&ps->list, &dev->filelist);
840         file->private_data = ps;
841         usb_unlock_device(dev);
842         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
843                         current->comm);
844         return ret;
845
846  out_unlock_device:
847         usb_unlock_device(dev);
848         usb_put_dev(dev);
849  out_free_ps:
850         kfree(ps);
851         return ret;
852 }
853
854 static int usbdev_release(struct inode *inode, struct file *file)
855 {
856         struct dev_state *ps = file->private_data;
857         struct usb_device *dev = ps->dev;
858         unsigned int ifnum;
859         struct async *as;
860
861         usb_lock_device(dev);
862         usb_hub_release_all_ports(dev, ps);
863
864         list_del_init(&ps->list);
865
866         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
867                         ifnum++) {
868                 if (test_bit(ifnum, &ps->ifclaimed))
869                         releaseintf(ps, ifnum);
870         }
871         destroy_all_async(ps);
872         usb_autosuspend_device(dev);
873         usb_unlock_device(dev);
874         usb_put_dev(dev);
875         put_pid(ps->disc_pid);
876         put_cred(ps->cred);
877
878         as = async_getcompleted(ps);
879         while (as) {
880                 free_async(as);
881                 as = async_getcompleted(ps);
882         }
883         kfree(ps);
884         return 0;
885 }
886
887 static int proc_control(struct dev_state *ps, void __user *arg)
888 {
889         struct usb_device *dev = ps->dev;
890         struct usbdevfs_ctrltransfer ctrl;
891         unsigned int tmo;
892         unsigned char *tbuf;
893         unsigned wLength;
894         int i, pipe, ret;
895
896         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
897                 return -EFAULT;
898         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
899                               ctrl.wIndex);
900         if (ret)
901                 return ret;
902         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
903         if (wLength > PAGE_SIZE)
904                 return -EINVAL;
905         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
906                         sizeof(struct usb_ctrlrequest));
907         if (ret)
908                 return ret;
909         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
910         if (!tbuf) {
911                 ret = -ENOMEM;
912                 goto done;
913         }
914         tmo = ctrl.timeout;
915         snoop(&dev->dev, "control urb: bRequestType=%02x "
916                 "bRequest=%02x wValue=%04x "
917                 "wIndex=%04x wLength=%04x\n",
918                 ctrl.bRequestType, ctrl.bRequest,
919                 __le16_to_cpup(&ctrl.wValue),
920                 __le16_to_cpup(&ctrl.wIndex),
921                 __le16_to_cpup(&ctrl.wLength));
922         if (ctrl.bRequestType & 0x80) {
923                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
924                                                ctrl.wLength)) {
925                         ret = -EINVAL;
926                         goto done;
927                 }
928                 pipe = usb_rcvctrlpipe(dev, 0);
929                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
930
931                 usb_unlock_device(dev);
932                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
933                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
934                                     tbuf, ctrl.wLength, tmo);
935                 usb_lock_device(dev);
936                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
937                           tbuf, max(i, 0));
938                 if ((i > 0) && ctrl.wLength) {
939                         if (copy_to_user(ctrl.data, tbuf, i)) {
940                                 ret = -EFAULT;
941                                 goto done;
942                         }
943                 }
944         } else {
945                 if (ctrl.wLength) {
946                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
947                                 ret = -EFAULT;
948                                 goto done;
949                         }
950                 }
951                 pipe = usb_sndctrlpipe(dev, 0);
952                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
953                         tbuf, ctrl.wLength);
954
955                 usb_unlock_device(dev);
956                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
957                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
958                                     tbuf, ctrl.wLength, tmo);
959                 usb_lock_device(dev);
960                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
961         }
962         if (i < 0 && i != -EPIPE) {
963                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
964                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
965                            current->comm, ctrl.bRequestType, ctrl.bRequest,
966                            ctrl.wLength, i);
967         }
968         ret = i;
969  done:
970         free_page((unsigned long) tbuf);
971         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
972                         sizeof(struct usb_ctrlrequest));
973         return ret;
974 }
975
976 static int proc_bulk(struct dev_state *ps, void __user *arg)
977 {
978         struct usb_device *dev = ps->dev;
979         struct usbdevfs_bulktransfer bulk;
980         unsigned int tmo, len1, pipe;
981         int len2;
982         unsigned char *tbuf;
983         int i, ret;
984
985         if (copy_from_user(&bulk, arg, sizeof(bulk)))
986                 return -EFAULT;
987         ret = findintfep(ps->dev, bulk.ep);
988         if (ret < 0)
989                 return ret;
990         ret = checkintf(ps, ret);
991         if (ret)
992                 return ret;
993         if (bulk.ep & USB_DIR_IN)
994                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
995         else
996                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
997         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
998                 return -EINVAL;
999         len1 = bulk.len;
1000         if (len1 >= USBFS_XFER_MAX)
1001                 return -EINVAL;
1002         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1003         if (ret)
1004                 return ret;
1005         if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
1006                 ret = -ENOMEM;
1007                 goto done;
1008         }
1009         tmo = bulk.timeout;
1010         if (bulk.ep & 0x80) {
1011                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1012                         ret = -EINVAL;
1013                         goto done;
1014                 }
1015                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1016
1017                 usb_unlock_device(dev);
1018                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1019                 usb_lock_device(dev);
1020                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1021
1022                 if (!i && len2) {
1023                         if (copy_to_user(bulk.data, tbuf, len2)) {
1024                                 ret = -EFAULT;
1025                                 goto done;
1026                         }
1027                 }
1028         } else {
1029                 if (len1) {
1030                         if (copy_from_user(tbuf, bulk.data, len1)) {
1031                                 ret = -EFAULT;
1032                                 goto done;
1033                         }
1034                 }
1035                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1036
1037                 usb_unlock_device(dev);
1038                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1039                 usb_lock_device(dev);
1040                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1041         }
1042         ret = (i < 0 ? i : len2);
1043  done:
1044         kfree(tbuf);
1045         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1046         return ret;
1047 }
1048
1049 static int proc_resetep(struct dev_state *ps, void __user *arg)
1050 {
1051         unsigned int ep;
1052         int ret;
1053
1054         if (get_user(ep, (unsigned int __user *)arg))
1055                 return -EFAULT;
1056         ret = findintfep(ps->dev, ep);
1057         if (ret < 0)
1058                 return ret;
1059         ret = checkintf(ps, ret);
1060         if (ret)
1061                 return ret;
1062         usb_reset_endpoint(ps->dev, ep);
1063         return 0;
1064 }
1065
1066 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
1067 {
1068         unsigned int ep;
1069         int pipe;
1070         int ret;
1071
1072         if (get_user(ep, (unsigned int __user *)arg))
1073                 return -EFAULT;
1074         ret = findintfep(ps->dev, ep);
1075         if (ret < 0)
1076                 return ret;
1077         ret = checkintf(ps, ret);
1078         if (ret)
1079                 return ret;
1080         if (ep & USB_DIR_IN)
1081                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1082         else
1083                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1084
1085         return usb_clear_halt(ps->dev, pipe);
1086 }
1087
1088 static int proc_getdriver(struct dev_state *ps, void __user *arg)
1089 {
1090         struct usbdevfs_getdriver gd;
1091         struct usb_interface *intf;
1092         int ret;
1093
1094         if (copy_from_user(&gd, arg, sizeof(gd)))
1095                 return -EFAULT;
1096         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1097         if (!intf || !intf->dev.driver)
1098                 ret = -ENODATA;
1099         else {
1100                 strlcpy(gd.driver, intf->dev.driver->name,
1101                                 sizeof(gd.driver));
1102                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1103         }
1104         return ret;
1105 }
1106
1107 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1108 {
1109         struct usbdevfs_connectinfo ci = {
1110                 .devnum = ps->dev->devnum,
1111                 .slow = ps->dev->speed == USB_SPEED_LOW
1112         };
1113
1114         if (copy_to_user(arg, &ci, sizeof(ci)))
1115                 return -EFAULT;
1116         return 0;
1117 }
1118
1119 static int proc_resetdevice(struct dev_state *ps)
1120 {
1121         return usb_reset_device(ps->dev);
1122 }
1123
1124 static int proc_setintf(struct dev_state *ps, void __user *arg)
1125 {
1126         struct usbdevfs_setinterface setintf;
1127         int ret;
1128
1129         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1130                 return -EFAULT;
1131         if ((ret = checkintf(ps, setintf.interface)))
1132                 return ret;
1133         return usb_set_interface(ps->dev, setintf.interface,
1134                         setintf.altsetting);
1135 }
1136
1137 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1138 {
1139         int u;
1140         int status = 0;
1141         struct usb_host_config *actconfig;
1142
1143         if (get_user(u, (int __user *)arg))
1144                 return -EFAULT;
1145
1146         actconfig = ps->dev->actconfig;
1147
1148         /* Don't touch the device if any interfaces are claimed.
1149          * It could interfere with other drivers' operations, and if
1150          * an interface is claimed by usbfs it could easily deadlock.
1151          */
1152         if (actconfig) {
1153                 int i;
1154
1155                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1156                         if (usb_interface_claimed(actconfig->interface[i])) {
1157                                 dev_warn(&ps->dev->dev,
1158                                         "usbfs: interface %d claimed by %s "
1159                                         "while '%s' sets config #%d\n",
1160                                         actconfig->interface[i]
1161                                                 ->cur_altsetting
1162                                                 ->desc.bInterfaceNumber,
1163                                         actconfig->interface[i]
1164                                                 ->dev.driver->name,
1165                                         current->comm, u);
1166                                 status = -EBUSY;
1167                                 break;
1168                         }
1169                 }
1170         }
1171
1172         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1173          * so avoid usb_set_configuration()'s kick to sysfs
1174          */
1175         if (status == 0) {
1176                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1177                         status = usb_reset_configuration(ps->dev);
1178                 else
1179                         status = usb_set_configuration(ps->dev, u);
1180         }
1181
1182         return status;
1183 }
1184
1185 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1186                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1187                         void __user *arg)
1188 {
1189         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1190         struct usb_host_endpoint *ep;
1191         struct async *as = NULL;
1192         struct usb_ctrlrequest *dr = NULL;
1193         unsigned int u, totlen, isofrmlen;
1194         int i, ret, is_in, num_sgs = 0, ifnum = -1;
1195         void *buf;
1196
1197         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1198                                 USBDEVFS_URB_SHORT_NOT_OK |
1199                                 USBDEVFS_URB_BULK_CONTINUATION |
1200                                 USBDEVFS_URB_NO_FSBR |
1201                                 USBDEVFS_URB_ZERO_PACKET |
1202                                 USBDEVFS_URB_NO_INTERRUPT))
1203                 return -EINVAL;
1204         if (uurb->buffer_length > 0 && !uurb->buffer)
1205                 return -EINVAL;
1206         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1207             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1208                 ifnum = findintfep(ps->dev, uurb->endpoint);
1209                 if (ifnum < 0)
1210                         return ifnum;
1211                 ret = checkintf(ps, ifnum);
1212                 if (ret)
1213                         return ret;
1214         }
1215         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1216                 is_in = 1;
1217                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1218         } else {
1219                 is_in = 0;
1220                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1221         }
1222         if (!ep)
1223                 return -ENOENT;
1224
1225         u = 0;
1226         switch(uurb->type) {
1227         case USBDEVFS_URB_TYPE_CONTROL:
1228                 if (!usb_endpoint_xfer_control(&ep->desc))
1229                         return -EINVAL;
1230                 /* min 8 byte setup packet */
1231                 if (uurb->buffer_length < 8)
1232                         return -EINVAL;
1233                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1234                 if (!dr)
1235                         return -ENOMEM;
1236                 if (copy_from_user(dr, uurb->buffer, 8)) {
1237                         ret = -EFAULT;
1238                         goto error;
1239                 }
1240                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1241                         ret = -EINVAL;
1242                         goto error;
1243                 }
1244                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1245                                       le16_to_cpup(&dr->wIndex));
1246                 if (ret)
1247                         goto error;
1248                 uurb->number_of_packets = 0;
1249                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1250                 uurb->buffer += 8;
1251                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1252                         is_in = 1;
1253                         uurb->endpoint |= USB_DIR_IN;
1254                 } else {
1255                         is_in = 0;
1256                         uurb->endpoint &= ~USB_DIR_IN;
1257                 }
1258                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1259                         "bRequest=%02x wValue=%04x "
1260                         "wIndex=%04x wLength=%04x\n",
1261                         dr->bRequestType, dr->bRequest,
1262                         __le16_to_cpup(&dr->wValue),
1263                         __le16_to_cpup(&dr->wIndex),
1264                         __le16_to_cpup(&dr->wLength));
1265                 u = sizeof(struct usb_ctrlrequest);
1266                 break;
1267
1268         case USBDEVFS_URB_TYPE_BULK:
1269                 switch (usb_endpoint_type(&ep->desc)) {
1270                 case USB_ENDPOINT_XFER_CONTROL:
1271                 case USB_ENDPOINT_XFER_ISOC:
1272                         return -EINVAL;
1273                 case USB_ENDPOINT_XFER_INT:
1274                         /* allow single-shot interrupt transfers */
1275                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1276                         goto interrupt_urb;
1277                 }
1278                 uurb->number_of_packets = 0;
1279                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1280                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1281                         num_sgs = 0;
1282                 break;
1283
1284         case USBDEVFS_URB_TYPE_INTERRUPT:
1285                 if (!usb_endpoint_xfer_int(&ep->desc))
1286                         return -EINVAL;
1287  interrupt_urb:
1288                 uurb->number_of_packets = 0;
1289                 break;
1290
1291         case USBDEVFS_URB_TYPE_ISO:
1292                 /* arbitrary limit */
1293                 if (uurb->number_of_packets < 1 ||
1294                     uurb->number_of_packets > 128)
1295                         return -EINVAL;
1296                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1297                         return -EINVAL;
1298                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1299                                    uurb->number_of_packets;
1300                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1301                         return -ENOMEM;
1302                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1303                         ret = -EFAULT;
1304                         goto error;
1305                 }
1306                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1307                         /*
1308                          * arbitrary limit need for USB 3.0
1309                          * bMaxBurst (0~15 allowed, 1~16 packets)
1310                          * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1311                          * sizemax: 1024 * 16 * 3 = 49152
1312                          */
1313                         if (isopkt[u].length > 49152) {
1314                                 ret = -EINVAL;
1315                                 goto error;
1316                         }
1317                         totlen += isopkt[u].length;
1318                 }
1319                 u *= sizeof(struct usb_iso_packet_descriptor);
1320                 uurb->buffer_length = totlen;
1321                 break;
1322
1323         default:
1324                 return -EINVAL;
1325         }
1326
1327         if (uurb->buffer_length >= USBFS_XFER_MAX) {
1328                 ret = -EINVAL;
1329                 goto error;
1330         }
1331         if (uurb->buffer_length > 0 &&
1332                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1333                                 uurb->buffer, uurb->buffer_length)) {
1334                 ret = -EFAULT;
1335                 goto error;
1336         }
1337         as = alloc_async(uurb->number_of_packets);
1338         if (!as) {
1339                 ret = -ENOMEM;
1340                 goto error;
1341         }
1342
1343         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1344              num_sgs * sizeof(struct scatterlist);
1345         ret = usbfs_increase_memory_usage(u);
1346         if (ret)
1347                 goto error;
1348         as->mem_usage = u;
1349
1350         if (num_sgs) {
1351                 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1352                                       GFP_KERNEL);
1353                 if (!as->urb->sg) {
1354                         ret = -ENOMEM;
1355                         goto error;
1356                 }
1357                 as->urb->num_sgs = num_sgs;
1358                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1359
1360                 totlen = uurb->buffer_length;
1361                 for (i = 0; i < as->urb->num_sgs; i++) {
1362                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1363                         buf = kmalloc(u, GFP_KERNEL);
1364                         if (!buf) {
1365                                 ret = -ENOMEM;
1366                                 goto error;
1367                         }
1368                         sg_set_buf(&as->urb->sg[i], buf, u);
1369
1370                         if (!is_in) {
1371                                 if (copy_from_user(buf, uurb->buffer, u)) {
1372                                         ret = -EFAULT;
1373                                         goto error;
1374                                 }
1375                                 uurb->buffer += u;
1376                         }
1377                         totlen -= u;
1378                 }
1379         } else if (uurb->buffer_length > 0) {
1380                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1381                                 GFP_KERNEL);
1382                 if (!as->urb->transfer_buffer) {
1383                         ret = -ENOMEM;
1384                         goto error;
1385                 }
1386
1387                 if (!is_in) {
1388                         if (copy_from_user(as->urb->transfer_buffer,
1389                                            uurb->buffer,
1390                                            uurb->buffer_length)) {
1391                                 ret = -EFAULT;
1392                                 goto error;
1393                         }
1394                 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1395                         /*
1396                          * Isochronous input data may end up being
1397                          * discontiguous if some of the packets are short.
1398                          * Clear the buffer so that the gaps don't leak
1399                          * kernel data to userspace.
1400                          */
1401                         memset(as->urb->transfer_buffer, 0,
1402                                         uurb->buffer_length);
1403                 }
1404         }
1405         as->urb->dev = ps->dev;
1406         as->urb->pipe = (uurb->type << 30) |
1407                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1408                         (uurb->endpoint & USB_DIR_IN);
1409
1410         /* This tedious sequence is necessary because the URB_* flags
1411          * are internal to the kernel and subject to change, whereas
1412          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1413          */
1414         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1415         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1416                 u |= URB_ISO_ASAP;
1417         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1418                 u |= URB_SHORT_NOT_OK;
1419         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1420                 u |= URB_NO_FSBR;
1421         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1422                 u |= URB_ZERO_PACKET;
1423         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1424                 u |= URB_NO_INTERRUPT;
1425         as->urb->transfer_flags = u;
1426
1427         as->urb->transfer_buffer_length = uurb->buffer_length;
1428         as->urb->setup_packet = (unsigned char *)dr;
1429         dr = NULL;
1430         as->urb->start_frame = uurb->start_frame;
1431         as->urb->number_of_packets = uurb->number_of_packets;
1432         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1433                         ps->dev->speed == USB_SPEED_HIGH)
1434                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1435         else
1436                 as->urb->interval = ep->desc.bInterval;
1437         as->urb->context = as;
1438         as->urb->complete = async_completed;
1439         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1440                 as->urb->iso_frame_desc[u].offset = totlen;
1441                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1442                 totlen += isopkt[u].length;
1443         }
1444         kfree(isopkt);
1445         isopkt = NULL;
1446         as->ps = ps;
1447         as->userurb = arg;
1448         if (is_in && uurb->buffer_length > 0)
1449                 as->userbuffer = uurb->buffer;
1450         else
1451                 as->userbuffer = NULL;
1452         as->signr = uurb->signr;
1453         as->ifnum = ifnum;
1454         as->pid = get_pid(task_pid(current));
1455         as->cred = get_current_cred();
1456         security_task_getsecid(current, &as->secid);
1457         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1458                         as->urb->transfer_buffer_length, 0, SUBMIT,
1459                         NULL, 0);
1460         if (!is_in)
1461                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1462
1463         async_newpending(as);
1464
1465         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1466                 spin_lock_irq(&ps->lock);
1467
1468                 /* Not exactly the endpoint address; the direction bit is
1469                  * shifted to the 0x10 position so that the value will be
1470                  * between 0 and 31.
1471                  */
1472                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1473                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1474                                 >> 3);
1475
1476                 /* If this bulk URB is the start of a new transfer, re-enable
1477                  * the endpoint.  Otherwise mark it as a continuation URB.
1478                  */
1479                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1480                         as->bulk_status = AS_CONTINUATION;
1481                 else
1482                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1483
1484                 /* Don't accept continuation URBs if the endpoint is
1485                  * disabled because of an earlier error.
1486                  */
1487                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1488                         ret = -EREMOTEIO;
1489                 else
1490                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1491                 spin_unlock_irq(&ps->lock);
1492         } else {
1493                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1494         }
1495
1496         if (ret) {
1497                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1498                            "usbfs: usb_submit_urb returned %d\n", ret);
1499                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1500                                 0, ret, COMPLETE, NULL, 0);
1501                 async_removepending(as);
1502                 goto error;
1503         }
1504         return 0;
1505
1506  error:
1507         kfree(isopkt);
1508         kfree(dr);
1509         if (as)
1510                 free_async(as);
1511         return ret;
1512 }
1513
1514 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1515 {
1516         struct usbdevfs_urb uurb;
1517
1518         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1519                 return -EFAULT;
1520
1521         return proc_do_submiturb(ps, &uurb,
1522                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1523                         arg);
1524 }
1525
1526 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1527 {
1528         struct urb *urb;
1529         struct async *as;
1530         unsigned long flags;
1531
1532         spin_lock_irqsave(&ps->lock, flags);
1533         as = async_getpending(ps, arg);
1534         if (!as) {
1535                 spin_unlock_irqrestore(&ps->lock, flags);
1536                 return -EINVAL;
1537         }
1538
1539         urb = as->urb;
1540         usb_get_urb(urb);
1541         spin_unlock_irqrestore(&ps->lock, flags);
1542
1543         usb_kill_urb(urb);
1544         usb_put_urb(urb);
1545
1546         return 0;
1547 }
1548
1549 static int processcompl(struct async *as, void __user * __user *arg)
1550 {
1551         struct urb *urb = as->urb;
1552         struct usbdevfs_urb __user *userurb = as->userurb;
1553         void __user *addr = as->userurb;
1554         unsigned int i;
1555
1556         if (as->userbuffer && urb->actual_length) {
1557                 if (copy_urb_data_to_user(as->userbuffer, urb))
1558                         goto err_out;
1559         }
1560         if (put_user(as->status, &userurb->status))
1561                 goto err_out;
1562         if (put_user(urb->actual_length, &userurb->actual_length))
1563                 goto err_out;
1564         if (put_user(urb->error_count, &userurb->error_count))
1565                 goto err_out;
1566
1567         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1568                 for (i = 0; i < urb->number_of_packets; i++) {
1569                         if (put_user(urb->iso_frame_desc[i].actual_length,
1570                                      &userurb->iso_frame_desc[i].actual_length))
1571                                 goto err_out;
1572                         if (put_user(urb->iso_frame_desc[i].status,
1573                                      &userurb->iso_frame_desc[i].status))
1574                                 goto err_out;
1575                 }
1576         }
1577
1578         if (put_user(addr, (void __user * __user *)arg))
1579                 return -EFAULT;
1580         return 0;
1581
1582 err_out:
1583         return -EFAULT;
1584 }
1585
1586 static struct async *reap_as(struct dev_state *ps)
1587 {
1588         DECLARE_WAITQUEUE(wait, current);
1589         struct async *as = NULL;
1590         struct usb_device *dev = ps->dev;
1591
1592         add_wait_queue(&ps->wait, &wait);
1593         for (;;) {
1594                 __set_current_state(TASK_INTERRUPTIBLE);
1595                 as = async_getcompleted(ps);
1596                 if (as || !connected(ps))
1597                         break;
1598                 if (signal_pending(current))
1599                         break;
1600                 usb_unlock_device(dev);
1601                 schedule();
1602                 usb_lock_device(dev);
1603         }
1604         remove_wait_queue(&ps->wait, &wait);
1605         set_current_state(TASK_RUNNING);
1606         return as;
1607 }
1608
1609 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1610 {
1611         struct async *as = reap_as(ps);
1612         if (as) {
1613                 int retval = processcompl(as, (void __user * __user *)arg);
1614                 free_async(as);
1615                 return retval;
1616         }
1617         if (signal_pending(current))
1618                 return -EINTR;
1619         return -ENODEV;
1620 }
1621
1622 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1623 {
1624         int retval;
1625         struct async *as;
1626
1627         as = async_getcompleted(ps);
1628         if (as) {
1629                 retval = processcompl(as, (void __user * __user *)arg);
1630                 free_async(as);
1631         } else {
1632                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1633         }
1634         return retval;
1635 }
1636
1637 #ifdef CONFIG_COMPAT
1638 static int proc_control_compat(struct dev_state *ps,
1639                                 struct usbdevfs_ctrltransfer32 __user *p32)
1640 {
1641         struct usbdevfs_ctrltransfer __user *p;
1642         __u32 udata;
1643         p = compat_alloc_user_space(sizeof(*p));
1644         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1645             get_user(udata, &p32->data) ||
1646             put_user(compat_ptr(udata), &p->data))
1647                 return -EFAULT;
1648         return proc_control(ps, p);
1649 }
1650
1651 static int proc_bulk_compat(struct dev_state *ps,
1652                         struct usbdevfs_bulktransfer32 __user *p32)
1653 {
1654         struct usbdevfs_bulktransfer __user *p;
1655         compat_uint_t n;
1656         compat_caddr_t addr;
1657
1658         p = compat_alloc_user_space(sizeof(*p));
1659
1660         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1661             get_user(n, &p32->len) || put_user(n, &p->len) ||
1662             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1663             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1664                 return -EFAULT;
1665
1666         return proc_bulk(ps, p);
1667 }
1668 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1669 {
1670         struct usbdevfs_disconnectsignal32 ds;
1671
1672         if (copy_from_user(&ds, arg, sizeof(ds)))
1673                 return -EFAULT;
1674         ps->discsignr = ds.signr;
1675         ps->disccontext = compat_ptr(ds.context);
1676         return 0;
1677 }
1678
1679 static int get_urb32(struct usbdevfs_urb *kurb,
1680                      struct usbdevfs_urb32 __user *uurb)
1681 {
1682         __u32  uptr;
1683         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1684             __get_user(kurb->type, &uurb->type) ||
1685             __get_user(kurb->endpoint, &uurb->endpoint) ||
1686             __get_user(kurb->status, &uurb->status) ||
1687             __get_user(kurb->flags, &uurb->flags) ||
1688             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1689             __get_user(kurb->actual_length, &uurb->actual_length) ||
1690             __get_user(kurb->start_frame, &uurb->start_frame) ||
1691             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1692             __get_user(kurb->error_count, &uurb->error_count) ||
1693             __get_user(kurb->signr, &uurb->signr))
1694                 return -EFAULT;
1695
1696         if (__get_user(uptr, &uurb->buffer))
1697                 return -EFAULT;
1698         kurb->buffer = compat_ptr(uptr);
1699         if (__get_user(uptr, &uurb->usercontext))
1700                 return -EFAULT;
1701         kurb->usercontext = compat_ptr(uptr);
1702
1703         return 0;
1704 }
1705
1706 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1707 {
1708         struct usbdevfs_urb uurb;
1709
1710         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1711                 return -EFAULT;
1712
1713         return proc_do_submiturb(ps, &uurb,
1714                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1715                         arg);
1716 }
1717
1718 static int processcompl_compat(struct async *as, void __user * __user *arg)
1719 {
1720         struct urb *urb = as->urb;
1721         struct usbdevfs_urb32 __user *userurb = as->userurb;
1722         void __user *addr = as->userurb;
1723         unsigned int i;
1724
1725         if (as->userbuffer && urb->actual_length) {
1726                 if (copy_urb_data_to_user(as->userbuffer, urb))
1727                         return -EFAULT;
1728         }
1729         if (put_user(as->status, &userurb->status))
1730                 return -EFAULT;
1731         if (put_user(urb->actual_length, &userurb->actual_length))
1732                 return -EFAULT;
1733         if (put_user(urb->error_count, &userurb->error_count))
1734                 return -EFAULT;
1735
1736         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1737                 for (i = 0; i < urb->number_of_packets; i++) {
1738                         if (put_user(urb->iso_frame_desc[i].actual_length,
1739                                      &userurb->iso_frame_desc[i].actual_length))
1740                                 return -EFAULT;
1741                         if (put_user(urb->iso_frame_desc[i].status,
1742                                      &userurb->iso_frame_desc[i].status))
1743                                 return -EFAULT;
1744                 }
1745         }
1746
1747         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1748                 return -EFAULT;
1749         return 0;
1750 }
1751
1752 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1753 {
1754         struct async *as = reap_as(ps);
1755         if (as) {
1756                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1757                 free_async(as);
1758                 return retval;
1759         }
1760         if (signal_pending(current))
1761                 return -EINTR;
1762         return -ENODEV;
1763 }
1764
1765 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1766 {
1767         int retval;
1768         struct async *as;
1769
1770         as = async_getcompleted(ps);
1771         if (as) {
1772                 retval = processcompl_compat(as, (void __user * __user *)arg);
1773                 free_async(as);
1774         } else {
1775                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1776         }
1777         return retval;
1778 }
1779
1780
1781 #endif
1782
1783 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1784 {
1785         struct usbdevfs_disconnectsignal ds;
1786
1787         if (copy_from_user(&ds, arg, sizeof(ds)))
1788                 return -EFAULT;
1789         ps->discsignr = ds.signr;
1790         ps->disccontext = ds.context;
1791         return 0;
1792 }
1793
1794 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1795 {
1796         unsigned int ifnum;
1797
1798         if (get_user(ifnum, (unsigned int __user *)arg))
1799                 return -EFAULT;
1800         return claimintf(ps, ifnum);
1801 }
1802
1803 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1804 {
1805         unsigned int ifnum;
1806         int ret;
1807
1808         if (get_user(ifnum, (unsigned int __user *)arg))
1809                 return -EFAULT;
1810         if ((ret = releaseintf(ps, ifnum)) < 0)
1811                 return ret;
1812         destroy_async_on_interface (ps, ifnum);
1813         return 0;
1814 }
1815
1816 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1817 {
1818         int                     size;
1819         void                    *buf = NULL;
1820         int                     retval = 0;
1821         struct usb_interface    *intf = NULL;
1822         struct usb_driver       *driver = NULL;
1823
1824         /* alloc buffer */
1825         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1826                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1827                         return -ENOMEM;
1828                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1829                         if (copy_from_user(buf, ctl->data, size)) {
1830                                 kfree(buf);
1831                                 return -EFAULT;
1832                         }
1833                 } else {
1834                         memset(buf, 0, size);
1835                 }
1836         }
1837
1838         if (!connected(ps)) {
1839                 kfree(buf);
1840                 return -ENODEV;
1841         }
1842
1843         if (ps->dev->state != USB_STATE_CONFIGURED)
1844                 retval = -EHOSTUNREACH;
1845         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1846                 retval = -EINVAL;
1847         else switch (ctl->ioctl_code) {
1848
1849         /* disconnect kernel driver from interface */
1850         case USBDEVFS_DISCONNECT:
1851                 if (intf->dev.driver) {
1852                         driver = to_usb_driver(intf->dev.driver);
1853                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1854                         usb_driver_release_interface(driver, intf);
1855                 } else
1856                         retval = -ENODATA;
1857                 break;
1858
1859         /* let kernel drivers try to (re)bind to the interface */
1860         case USBDEVFS_CONNECT:
1861                 if (!intf->dev.driver)
1862                         retval = device_attach(&intf->dev);
1863                 else
1864                         retval = -EBUSY;
1865                 break;
1866
1867         /* talk directly to the interface's driver */
1868         default:
1869                 if (intf->dev.driver)
1870                         driver = to_usb_driver(intf->dev.driver);
1871                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1872                         retval = -ENOTTY;
1873                 } else {
1874                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1875                         if (retval == -ENOIOCTLCMD)
1876                                 retval = -ENOTTY;
1877                 }
1878         }
1879
1880         /* cleanup and return */
1881         if (retval >= 0
1882                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1883                         && size > 0
1884                         && copy_to_user(ctl->data, buf, size) != 0)
1885                 retval = -EFAULT;
1886
1887         kfree(buf);
1888         return retval;
1889 }
1890
1891 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1892 {
1893         struct usbdevfs_ioctl   ctrl;
1894
1895         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1896                 return -EFAULT;
1897         return proc_ioctl(ps, &ctrl);
1898 }
1899
1900 #ifdef CONFIG_COMPAT
1901 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1902 {
1903         struct usbdevfs_ioctl32 __user *uioc;
1904         struct usbdevfs_ioctl ctrl;
1905         u32 udata;
1906
1907         uioc = compat_ptr((long)arg);
1908         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1909             __get_user(ctrl.ifno, &uioc->ifno) ||
1910             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1911             __get_user(udata, &uioc->data))
1912                 return -EFAULT;
1913         ctrl.data = compat_ptr(udata);
1914
1915         return proc_ioctl(ps, &ctrl);
1916 }
1917 #endif
1918
1919 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1920 {
1921         unsigned portnum;
1922         int rc;
1923
1924         if (get_user(portnum, (unsigned __user *) arg))
1925                 return -EFAULT;
1926         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1927         if (rc == 0)
1928                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1929                         portnum, task_pid_nr(current), current->comm);
1930         return rc;
1931 }
1932
1933 static int proc_release_port(struct dev_state *ps, void __user *arg)
1934 {
1935         unsigned portnum;
1936
1937         if (get_user(portnum, (unsigned __user *) arg))
1938                 return -EFAULT;
1939         return usb_hub_release_port(ps->dev, portnum, ps);
1940 }
1941
1942 static int proc_get_capabilities(struct dev_state *ps, void __user *arg)
1943 {
1944         __u32 caps;
1945
1946         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
1947                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT;
1948         if (!ps->dev->bus->no_stop_on_short)
1949                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
1950         if (ps->dev->bus->sg_tablesize)
1951                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
1952
1953         if (put_user(caps, (__u32 __user *)arg))
1954                 return -EFAULT;
1955
1956         return 0;
1957 }
1958
1959 static int proc_disconnect_claim(struct dev_state *ps, void __user *arg)
1960 {
1961         struct usbdevfs_disconnect_claim dc;
1962         struct usb_interface *intf;
1963
1964         if (copy_from_user(&dc, arg, sizeof(dc)))
1965                 return -EFAULT;
1966
1967         intf = usb_ifnum_to_if(ps->dev, dc.interface);
1968         if (!intf)
1969                 return -EINVAL;
1970
1971         if (intf->dev.driver) {
1972                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
1973
1974                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
1975                                 strncmp(dc.driver, intf->dev.driver->name,
1976                                         sizeof(dc.driver)) != 0)
1977                         return -EBUSY;
1978
1979                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
1980                                 strncmp(dc.driver, intf->dev.driver->name,
1981                                         sizeof(dc.driver)) == 0)
1982                         return -EBUSY;
1983
1984                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1985                 usb_driver_release_interface(driver, intf);
1986         }
1987
1988         return claimintf(ps, dc.interface);
1989 }
1990
1991 /*
1992  * NOTE:  All requests here that have interface numbers as parameters
1993  * are assuming that somehow the configuration has been prevented from
1994  * changing.  But there's no mechanism to ensure that...
1995  */
1996 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1997                                 void __user *p)
1998 {
1999         struct dev_state *ps = file->private_data;
2000         struct inode *inode = file_inode(file);
2001         struct usb_device *dev = ps->dev;
2002         int ret = -ENOTTY;
2003
2004         if (!(file->f_mode & FMODE_WRITE))
2005                 return -EPERM;
2006
2007         usb_lock_device(dev);
2008
2009         /* Reap operations are allowed even after disconnection */
2010         switch (cmd) {
2011         case USBDEVFS_REAPURB:
2012                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2013                 ret = proc_reapurb(ps, p);
2014                 goto done;
2015
2016         case USBDEVFS_REAPURBNDELAY:
2017                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2018                 ret = proc_reapurbnonblock(ps, p);
2019                 goto done;
2020
2021 #ifdef CONFIG_COMPAT
2022         case USBDEVFS_REAPURB32:
2023                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2024                 ret = proc_reapurb_compat(ps, p);
2025                 goto done;
2026
2027         case USBDEVFS_REAPURBNDELAY32:
2028                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2029                 ret = proc_reapurbnonblock_compat(ps, p);
2030                 goto done;
2031 #endif
2032         }
2033
2034         if (!connected(ps)) {
2035                 usb_unlock_device(dev);
2036                 return -ENODEV;
2037         }
2038
2039         switch (cmd) {
2040         case USBDEVFS_CONTROL:
2041                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2042                 ret = proc_control(ps, p);
2043                 if (ret >= 0)
2044                         inode->i_mtime = CURRENT_TIME;
2045                 break;
2046
2047         case USBDEVFS_BULK:
2048                 snoop(&dev->dev, "%s: BULK\n", __func__);
2049                 ret = proc_bulk(ps, p);
2050                 if (ret >= 0)
2051                         inode->i_mtime = CURRENT_TIME;
2052                 break;
2053
2054         case USBDEVFS_RESETEP:
2055                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2056                 ret = proc_resetep(ps, p);
2057                 if (ret >= 0)
2058                         inode->i_mtime = CURRENT_TIME;
2059                 break;
2060
2061         case USBDEVFS_RESET:
2062                 snoop(&dev->dev, "%s: RESET\n", __func__);
2063                 ret = proc_resetdevice(ps);
2064                 break;
2065
2066         case USBDEVFS_CLEAR_HALT:
2067                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2068                 ret = proc_clearhalt(ps, p);
2069                 if (ret >= 0)
2070                         inode->i_mtime = CURRENT_TIME;
2071                 break;
2072
2073         case USBDEVFS_GETDRIVER:
2074                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2075                 ret = proc_getdriver(ps, p);
2076                 break;
2077
2078         case USBDEVFS_CONNECTINFO:
2079                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2080                 ret = proc_connectinfo(ps, p);
2081                 break;
2082
2083         case USBDEVFS_SETINTERFACE:
2084                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2085                 ret = proc_setintf(ps, p);
2086                 break;
2087
2088         case USBDEVFS_SETCONFIGURATION:
2089                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2090                 ret = proc_setconfig(ps, p);
2091                 break;
2092
2093         case USBDEVFS_SUBMITURB:
2094                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2095                 ret = proc_submiturb(ps, p);
2096                 if (ret >= 0)
2097                         inode->i_mtime = CURRENT_TIME;
2098                 break;
2099
2100 #ifdef CONFIG_COMPAT
2101         case USBDEVFS_CONTROL32:
2102                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2103                 ret = proc_control_compat(ps, p);
2104                 if (ret >= 0)
2105                         inode->i_mtime = CURRENT_TIME;
2106                 break;
2107
2108         case USBDEVFS_BULK32:
2109                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2110                 ret = proc_bulk_compat(ps, p);
2111                 if (ret >= 0)
2112                         inode->i_mtime = CURRENT_TIME;
2113                 break;
2114
2115         case USBDEVFS_DISCSIGNAL32:
2116                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2117                 ret = proc_disconnectsignal_compat(ps, p);
2118                 break;
2119
2120         case USBDEVFS_SUBMITURB32:
2121                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2122                 ret = proc_submiturb_compat(ps, p);
2123                 if (ret >= 0)
2124                         inode->i_mtime = CURRENT_TIME;
2125                 break;
2126
2127         case USBDEVFS_IOCTL32:
2128                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2129                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2130                 break;
2131 #endif
2132
2133         case USBDEVFS_DISCARDURB:
2134                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2135                 ret = proc_unlinkurb(ps, p);
2136                 break;
2137
2138         case USBDEVFS_DISCSIGNAL:
2139                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2140                 ret = proc_disconnectsignal(ps, p);
2141                 break;
2142
2143         case USBDEVFS_CLAIMINTERFACE:
2144                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2145                 ret = proc_claiminterface(ps, p);
2146                 break;
2147
2148         case USBDEVFS_RELEASEINTERFACE:
2149                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2150                 ret = proc_releaseinterface(ps, p);
2151                 break;
2152
2153         case USBDEVFS_IOCTL:
2154                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2155                 ret = proc_ioctl_default(ps, p);
2156                 break;
2157
2158         case USBDEVFS_CLAIM_PORT:
2159                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2160                 ret = proc_claim_port(ps, p);
2161                 break;
2162
2163         case USBDEVFS_RELEASE_PORT:
2164                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2165                 ret = proc_release_port(ps, p);
2166                 break;
2167         case USBDEVFS_GET_CAPABILITIES:
2168                 ret = proc_get_capabilities(ps, p);
2169                 break;
2170         case USBDEVFS_DISCONNECT_CLAIM:
2171                 ret = proc_disconnect_claim(ps, p);
2172                 break;
2173         }
2174
2175  done:
2176         usb_unlock_device(dev);
2177         if (ret >= 0)
2178                 inode->i_atime = CURRENT_TIME;
2179         return ret;
2180 }
2181
2182 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2183                         unsigned long arg)
2184 {
2185         int ret;
2186
2187         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2188
2189         return ret;
2190 }
2191
2192 #ifdef CONFIG_COMPAT
2193 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2194                         unsigned long arg)
2195 {
2196         int ret;
2197
2198         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2199
2200         return ret;
2201 }
2202 #endif
2203
2204 /* No kernel lock - fine */
2205 static unsigned int usbdev_poll(struct file *file,
2206                                 struct poll_table_struct *wait)
2207 {
2208         struct dev_state *ps = file->private_data;
2209         unsigned int mask = 0;
2210
2211         poll_wait(file, &ps->wait, wait);
2212         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2213                 mask |= POLLOUT | POLLWRNORM;
2214         if (!connected(ps))
2215                 mask |= POLLERR | POLLHUP;
2216         return mask;
2217 }
2218
2219 const struct file_operations usbdev_file_operations = {
2220         .owner =          THIS_MODULE,
2221         .llseek =         usbdev_lseek,
2222         .read =           usbdev_read,
2223         .poll =           usbdev_poll,
2224         .unlocked_ioctl = usbdev_ioctl,
2225 #ifdef CONFIG_COMPAT
2226         .compat_ioctl =   usbdev_compat_ioctl,
2227 #endif
2228         .open =           usbdev_open,
2229         .release =        usbdev_release,
2230 };
2231
2232 static void usbdev_remove(struct usb_device *udev)
2233 {
2234         struct dev_state *ps;
2235         struct siginfo sinfo;
2236
2237         while (!list_empty(&udev->filelist)) {
2238                 ps = list_entry(udev->filelist.next, struct dev_state, list);
2239                 destroy_all_async(ps);
2240                 wake_up_all(&ps->wait);
2241                 list_del_init(&ps->list);
2242                 if (ps->discsignr) {
2243                         memset(&sinfo, 0, sizeof(sinfo));
2244                         sinfo.si_signo = ps->discsignr;
2245                         sinfo.si_errno = EPIPE;
2246                         sinfo.si_code = SI_ASYNCIO;
2247                         sinfo.si_addr = ps->disccontext;
2248                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2249                                         ps->disc_pid, ps->cred, ps->secid);
2250                 }
2251         }
2252 }
2253
2254 static int usbdev_notify(struct notifier_block *self,
2255                                unsigned long action, void *dev)
2256 {
2257         switch (action) {
2258         case USB_DEVICE_ADD:
2259                 break;
2260         case USB_DEVICE_REMOVE:
2261                 usbdev_remove(dev);
2262                 break;
2263         }
2264         return NOTIFY_OK;
2265 }
2266
2267 static struct notifier_block usbdev_nb = {
2268         .notifier_call =        usbdev_notify,
2269 };
2270
2271 static struct cdev usb_device_cdev;
2272
2273 int __init usb_devio_init(void)
2274 {
2275         int retval;
2276
2277         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2278                                         "usb_device");
2279         if (retval) {
2280                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2281                 goto out;
2282         }
2283         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2284         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2285         if (retval) {
2286                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2287                        USB_DEVICE_MAJOR);
2288                 goto error_cdev;
2289         }
2290         usb_register_notify(&usbdev_nb);
2291 out:
2292         return retval;
2293
2294 error_cdev:
2295         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2296         goto out;
2297 }
2298
2299 void usb_devio_cleanup(void)
2300 {
2301         usb_unregister_notify(&usbdev_nb);
2302         cdev_del(&usb_device_cdev);
2303         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2304 }