USB: usbfs: properly clean up the as structure on error paths
[linux-2.6.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/smp_lock.h>
41 #include <linux/signal.h>
42 #include <linux/poll.h>
43 #include <linux/module.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/cdev.h>
47 #include <linux/notifier.h>
48 #include <linux/security.h>
49 #include <asm/uaccess.h>
50 #include <asm/byteorder.h>
51 #include <linux/moduleparam.h>
52
53 #include "hcd.h"        /* for usbcore internals */
54 #include "usb.h"
55 #include "hub.h"
56
57 #define USB_MAXBUS                      64
58 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
59
60 /* Mutual exclusion for removal, open, and release */
61 DEFINE_MUTEX(usbfs_mutex);
62
63 struct dev_state {
64         struct list_head list;      /* state list */
65         struct usb_device *dev;
66         struct file *file;
67         spinlock_t lock;            /* protects the async urb lists */
68         struct list_head async_pending;
69         struct list_head async_completed;
70         wait_queue_head_t wait;     /* wake up if a request completed */
71         unsigned int discsignr;
72         struct pid *disc_pid;
73         uid_t disc_uid, disc_euid;
74         void __user *disccontext;
75         unsigned long ifclaimed;
76         u32 secid;
77         u32 disabled_bulk_eps;
78 };
79
80 struct async {
81         struct list_head asynclist;
82         struct dev_state *ps;
83         struct pid *pid;
84         uid_t uid, euid;
85         unsigned int signr;
86         unsigned int ifnum;
87         void __user *userbuffer;
88         void __user *userurb;
89         struct urb *urb;
90         int status;
91         u32 secid;
92         u8 bulk_addr;
93         u8 bulk_status;
94 };
95
96 static int usbfs_snoop;
97 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
98 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
99
100 #define snoop(dev, format, arg...)                              \
101         do {                                                    \
102                 if (usbfs_snoop)                                \
103                         dev_info(dev , format , ## arg);        \
104         } while (0)
105
106 enum snoop_when {
107         SUBMIT, COMPLETE
108 };
109
110 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
111
112 #define MAX_USBFS_BUFFER_SIZE   16384
113
114
115 static int connected(struct dev_state *ps)
116 {
117         return (!list_empty(&ps->list) &&
118                         ps->dev->state != USB_STATE_NOTATTACHED);
119 }
120
121 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
122 {
123         loff_t ret;
124
125         lock_kernel();
126
127         switch (orig) {
128         case 0:
129                 file->f_pos = offset;
130                 ret = file->f_pos;
131                 break;
132         case 1:
133                 file->f_pos += offset;
134                 ret = file->f_pos;
135                 break;
136         case 2:
137         default:
138                 ret = -EINVAL;
139         }
140
141         unlock_kernel();
142         return ret;
143 }
144
145 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
146                            loff_t *ppos)
147 {
148         struct dev_state *ps = file->private_data;
149         struct usb_device *dev = ps->dev;
150         ssize_t ret = 0;
151         unsigned len;
152         loff_t pos;
153         int i;
154
155         pos = *ppos;
156         usb_lock_device(dev);
157         if (!connected(ps)) {
158                 ret = -ENODEV;
159                 goto err;
160         } else if (pos < 0) {
161                 ret = -EINVAL;
162                 goto err;
163         }
164
165         if (pos < sizeof(struct usb_device_descriptor)) {
166                 /* 18 bytes - fits on the stack */
167                 struct usb_device_descriptor temp_desc;
168
169                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
170                 le16_to_cpus(&temp_desc.bcdUSB);
171                 le16_to_cpus(&temp_desc.idVendor);
172                 le16_to_cpus(&temp_desc.idProduct);
173                 le16_to_cpus(&temp_desc.bcdDevice);
174
175                 len = sizeof(struct usb_device_descriptor) - pos;
176                 if (len > nbytes)
177                         len = nbytes;
178                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
179                         ret = -EFAULT;
180                         goto err;
181                 }
182
183                 *ppos += len;
184                 buf += len;
185                 nbytes -= len;
186                 ret += len;
187         }
188
189         pos = sizeof(struct usb_device_descriptor);
190         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
191                 struct usb_config_descriptor *config =
192                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
193                 unsigned int length = le16_to_cpu(config->wTotalLength);
194
195                 if (*ppos < pos + length) {
196
197                         /* The descriptor may claim to be longer than it
198                          * really is.  Here is the actual allocated length. */
199                         unsigned alloclen =
200                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
201
202                         len = length - (*ppos - pos);
203                         if (len > nbytes)
204                                 len = nbytes;
205
206                         /* Simply don't write (skip over) unallocated parts */
207                         if (alloclen > (*ppos - pos)) {
208                                 alloclen -= (*ppos - pos);
209                                 if (copy_to_user(buf,
210                                     dev->rawdescriptors[i] + (*ppos - pos),
211                                     min(len, alloclen))) {
212                                         ret = -EFAULT;
213                                         goto err;
214                                 }
215                         }
216
217                         *ppos += len;
218                         buf += len;
219                         nbytes -= len;
220                         ret += len;
221                 }
222
223                 pos += length;
224         }
225
226 err:
227         usb_unlock_device(dev);
228         return ret;
229 }
230
231 /*
232  * async list handling
233  */
234
235 static struct async *alloc_async(unsigned int numisoframes)
236 {
237         struct async *as;
238
239         as = kzalloc(sizeof(struct async), GFP_KERNEL);
240         if (!as)
241                 return NULL;
242         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
243         if (!as->urb) {
244                 kfree(as);
245                 return NULL;
246         }
247         return as;
248 }
249
250 static void free_async(struct async *as)
251 {
252         put_pid(as->pid);
253         kfree(as->urb->transfer_buffer);
254         kfree(as->urb->setup_packet);
255         usb_free_urb(as->urb);
256         kfree(as);
257 }
258
259 static void async_newpending(struct async *as)
260 {
261         struct dev_state *ps = as->ps;
262         unsigned long flags;
263
264         spin_lock_irqsave(&ps->lock, flags);
265         list_add_tail(&as->asynclist, &ps->async_pending);
266         spin_unlock_irqrestore(&ps->lock, flags);
267 }
268
269 static void async_removepending(struct async *as)
270 {
271         struct dev_state *ps = as->ps;
272         unsigned long flags;
273
274         spin_lock_irqsave(&ps->lock, flags);
275         list_del_init(&as->asynclist);
276         spin_unlock_irqrestore(&ps->lock, flags);
277 }
278
279 static struct async *async_getcompleted(struct dev_state *ps)
280 {
281         unsigned long flags;
282         struct async *as = NULL;
283
284         spin_lock_irqsave(&ps->lock, flags);
285         if (!list_empty(&ps->async_completed)) {
286                 as = list_entry(ps->async_completed.next, struct async,
287                                 asynclist);
288                 list_del_init(&as->asynclist);
289         }
290         spin_unlock_irqrestore(&ps->lock, flags);
291         return as;
292 }
293
294 static struct async *async_getpending(struct dev_state *ps,
295                                              void __user *userurb)
296 {
297         unsigned long flags;
298         struct async *as;
299
300         spin_lock_irqsave(&ps->lock, flags);
301         list_for_each_entry(as, &ps->async_pending, asynclist)
302                 if (as->userurb == userurb) {
303                         list_del_init(&as->asynclist);
304                         spin_unlock_irqrestore(&ps->lock, flags);
305                         return as;
306                 }
307         spin_unlock_irqrestore(&ps->lock, flags);
308         return NULL;
309 }
310
311 static void snoop_urb(struct usb_device *udev,
312                 void __user *userurb, int pipe, unsigned length,
313                 int timeout_or_status, enum snoop_when when)
314 {
315         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
316         static const char *dirs[] = {"out", "in"};
317         int ep;
318         const char *t, *d;
319
320         if (!usbfs_snoop)
321                 return;
322
323         ep = usb_pipeendpoint(pipe);
324         t = types[usb_pipetype(pipe)];
325         d = dirs[!!usb_pipein(pipe)];
326
327         if (userurb) {          /* Async */
328                 if (when == SUBMIT)
329                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
330                                         "length %u\n",
331                                         userurb, ep, t, d, length);
332                 else
333                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
334                                         "actual_length %u status %d\n",
335                                         userurb, ep, t, d, length,
336                                         timeout_or_status);
337         } else {
338                 if (when == SUBMIT)
339                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
340                                         "timeout %d\n",
341                                         ep, t, d, length, timeout_or_status);
342                 else
343                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
344                                         "status %d\n",
345                                         ep, t, d, length, timeout_or_status);
346         }
347 }
348
349 #define AS_CONTINUATION 1
350 #define AS_UNLINK       2
351
352 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
353 __releases(ps->lock)
354 __acquires(ps->lock)
355 {
356         struct async *as;
357
358         /* Mark all the pending URBs that match bulk_addr, up to but not
359          * including the first one without AS_CONTINUATION.  If such an
360          * URB is encountered then a new transfer has already started so
361          * the endpoint doesn't need to be disabled; otherwise it does.
362          */
363         list_for_each_entry(as, &ps->async_pending, asynclist) {
364                 if (as->bulk_addr == bulk_addr) {
365                         if (as->bulk_status != AS_CONTINUATION)
366                                 goto rescan;
367                         as->bulk_status = AS_UNLINK;
368                         as->bulk_addr = 0;
369                 }
370         }
371         ps->disabled_bulk_eps |= (1 << bulk_addr);
372
373         /* Now carefully unlink all the marked pending URBs */
374  rescan:
375         list_for_each_entry(as, &ps->async_pending, asynclist) {
376                 if (as->bulk_status == AS_UNLINK) {
377                         as->bulk_status = 0;            /* Only once */
378                         spin_unlock(&ps->lock);         /* Allow completions */
379                         usb_unlink_urb(as->urb);
380                         spin_lock(&ps->lock);
381                         goto rescan;
382                 }
383         }
384 }
385
386 static void async_completed(struct urb *urb)
387 {
388         struct async *as = urb->context;
389         struct dev_state *ps = as->ps;
390         struct siginfo sinfo;
391         struct pid *pid = NULL;
392         uid_t uid = 0;
393         uid_t euid = 0;
394         u32 secid = 0;
395         int signr;
396
397         spin_lock(&ps->lock);
398         list_move_tail(&as->asynclist, &ps->async_completed);
399         as->status = urb->status;
400         signr = as->signr;
401         if (signr) {
402                 sinfo.si_signo = as->signr;
403                 sinfo.si_errno = as->status;
404                 sinfo.si_code = SI_ASYNCIO;
405                 sinfo.si_addr = as->userurb;
406                 pid = as->pid;
407                 uid = as->uid;
408                 euid = as->euid;
409                 secid = as->secid;
410         }
411         snoop(&urb->dev->dev, "urb complete\n");
412         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
413                         as->status, COMPLETE);
414         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
415                         as->status != -ENOENT)
416                 cancel_bulk_urbs(ps, as->bulk_addr);
417         spin_unlock(&ps->lock);
418
419         if (signr)
420                 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
421                                       euid, secid);
422
423         wake_up(&ps->wait);
424 }
425
426 static void destroy_async(struct dev_state *ps, struct list_head *list)
427 {
428         struct async *as;
429         unsigned long flags;
430
431         spin_lock_irqsave(&ps->lock, flags);
432         while (!list_empty(list)) {
433                 as = list_entry(list->next, struct async, asynclist);
434                 list_del_init(&as->asynclist);
435
436                 /* drop the spinlock so the completion handler can run */
437                 spin_unlock_irqrestore(&ps->lock, flags);
438                 usb_kill_urb(as->urb);
439                 spin_lock_irqsave(&ps->lock, flags);
440         }
441         spin_unlock_irqrestore(&ps->lock, flags);
442 }
443
444 static void destroy_async_on_interface(struct dev_state *ps,
445                                        unsigned int ifnum)
446 {
447         struct list_head *p, *q, hitlist;
448         unsigned long flags;
449
450         INIT_LIST_HEAD(&hitlist);
451         spin_lock_irqsave(&ps->lock, flags);
452         list_for_each_safe(p, q, &ps->async_pending)
453                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
454                         list_move_tail(p, &hitlist);
455         spin_unlock_irqrestore(&ps->lock, flags);
456         destroy_async(ps, &hitlist);
457 }
458
459 static void destroy_all_async(struct dev_state *ps)
460 {
461         destroy_async(ps, &ps->async_pending);
462 }
463
464 /*
465  * interface claims are made only at the request of user level code,
466  * which can also release them (explicitly or by closing files).
467  * they're also undone when devices disconnect.
468  */
469
470 static int driver_probe(struct usb_interface *intf,
471                         const struct usb_device_id *id)
472 {
473         return -ENODEV;
474 }
475
476 static void driver_disconnect(struct usb_interface *intf)
477 {
478         struct dev_state *ps = usb_get_intfdata(intf);
479         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
480
481         if (!ps)
482                 return;
483
484         /* NOTE:  this relies on usbcore having canceled and completed
485          * all pending I/O requests; 2.6 does that.
486          */
487
488         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
489                 clear_bit(ifnum, &ps->ifclaimed);
490         else
491                 dev_warn(&intf->dev, "interface number %u out of range\n",
492                          ifnum);
493
494         usb_set_intfdata(intf, NULL);
495
496         /* force async requests to complete */
497         destroy_async_on_interface(ps, ifnum);
498 }
499
500 /* The following routines are merely placeholders.  There is no way
501  * to inform a user task about suspend or resumes.
502  */
503 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
504 {
505         return 0;
506 }
507
508 static int driver_resume(struct usb_interface *intf)
509 {
510         return 0;
511 }
512
513 struct usb_driver usbfs_driver = {
514         .name =         "usbfs",
515         .probe =        driver_probe,
516         .disconnect =   driver_disconnect,
517         .suspend =      driver_suspend,
518         .resume =       driver_resume,
519 };
520
521 static int claimintf(struct dev_state *ps, unsigned int ifnum)
522 {
523         struct usb_device *dev = ps->dev;
524         struct usb_interface *intf;
525         int err;
526
527         if (ifnum >= 8*sizeof(ps->ifclaimed))
528                 return -EINVAL;
529         /* already claimed */
530         if (test_bit(ifnum, &ps->ifclaimed))
531                 return 0;
532
533         intf = usb_ifnum_to_if(dev, ifnum);
534         if (!intf)
535                 err = -ENOENT;
536         else
537                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
538         if (err == 0)
539                 set_bit(ifnum, &ps->ifclaimed);
540         return err;
541 }
542
543 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
544 {
545         struct usb_device *dev;
546         struct usb_interface *intf;
547         int err;
548
549         err = -EINVAL;
550         if (ifnum >= 8*sizeof(ps->ifclaimed))
551                 return err;
552         dev = ps->dev;
553         intf = usb_ifnum_to_if(dev, ifnum);
554         if (!intf)
555                 err = -ENOENT;
556         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
557                 usb_driver_release_interface(&usbfs_driver, intf);
558                 err = 0;
559         }
560         return err;
561 }
562
563 static int checkintf(struct dev_state *ps, unsigned int ifnum)
564 {
565         if (ps->dev->state != USB_STATE_CONFIGURED)
566                 return -EHOSTUNREACH;
567         if (ifnum >= 8*sizeof(ps->ifclaimed))
568                 return -EINVAL;
569         if (test_bit(ifnum, &ps->ifclaimed))
570                 return 0;
571         /* if not yet claimed, claim it for the driver */
572         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
573                  "interface %u before use\n", task_pid_nr(current),
574                  current->comm, ifnum);
575         return claimintf(ps, ifnum);
576 }
577
578 static int findintfep(struct usb_device *dev, unsigned int ep)
579 {
580         unsigned int i, j, e;
581         struct usb_interface *intf;
582         struct usb_host_interface *alts;
583         struct usb_endpoint_descriptor *endpt;
584
585         if (ep & ~(USB_DIR_IN|0xf))
586                 return -EINVAL;
587         if (!dev->actconfig)
588                 return -ESRCH;
589         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
590                 intf = dev->actconfig->interface[i];
591                 for (j = 0; j < intf->num_altsetting; j++) {
592                         alts = &intf->altsetting[j];
593                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
594                                 endpt = &alts->endpoint[e].desc;
595                                 if (endpt->bEndpointAddress == ep)
596                                         return alts->desc.bInterfaceNumber;
597                         }
598                 }
599         }
600         return -ENOENT;
601 }
602
603 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
604                            unsigned int index)
605 {
606         int ret = 0;
607
608         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
609          && ps->dev->state != USB_STATE_ADDRESS
610          && ps->dev->state != USB_STATE_CONFIGURED)
611                 return -EHOSTUNREACH;
612         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
613                 return 0;
614
615         index &= 0xff;
616         switch (requesttype & USB_RECIP_MASK) {
617         case USB_RECIP_ENDPOINT:
618                 ret = findintfep(ps->dev, index);
619                 if (ret >= 0)
620                         ret = checkintf(ps, ret);
621                 break;
622
623         case USB_RECIP_INTERFACE:
624                 ret = checkintf(ps, index);
625                 break;
626         }
627         return ret;
628 }
629
630 static int match_devt(struct device *dev, void *data)
631 {
632         return dev->devt == (dev_t) (unsigned long) data;
633 }
634
635 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
636 {
637         struct device *dev;
638
639         dev = bus_find_device(&usb_bus_type, NULL,
640                               (void *) (unsigned long) devt, match_devt);
641         if (!dev)
642                 return NULL;
643         return container_of(dev, struct usb_device, dev);
644 }
645
646 /*
647  * file operations
648  */
649 static int usbdev_open(struct inode *inode, struct file *file)
650 {
651         struct usb_device *dev = NULL;
652         struct dev_state *ps;
653         const struct cred *cred = current_cred();
654         int ret;
655
656         lock_kernel();
657         /* Protect against simultaneous removal or release */
658         mutex_lock(&usbfs_mutex);
659
660         ret = -ENOMEM;
661         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
662         if (!ps)
663                 goto out;
664
665         ret = -ENODEV;
666
667         /* usbdev device-node */
668         if (imajor(inode) == USB_DEVICE_MAJOR)
669                 dev = usbdev_lookup_by_devt(inode->i_rdev);
670 #ifdef CONFIG_USB_DEVICEFS
671         /* procfs file */
672         if (!dev) {
673                 dev = inode->i_private;
674                 if (dev && dev->usbfs_dentry &&
675                                         dev->usbfs_dentry->d_inode == inode)
676                         usb_get_dev(dev);
677                 else
678                         dev = NULL;
679         }
680 #endif
681         if (!dev || dev->state == USB_STATE_NOTATTACHED)
682                 goto out;
683         ret = usb_autoresume_device(dev);
684         if (ret)
685                 goto out;
686
687         ret = 0;
688         ps->dev = dev;
689         ps->file = file;
690         spin_lock_init(&ps->lock);
691         INIT_LIST_HEAD(&ps->list);
692         INIT_LIST_HEAD(&ps->async_pending);
693         INIT_LIST_HEAD(&ps->async_completed);
694         init_waitqueue_head(&ps->wait);
695         ps->discsignr = 0;
696         ps->disc_pid = get_pid(task_pid(current));
697         ps->disc_uid = cred->uid;
698         ps->disc_euid = cred->euid;
699         ps->disccontext = NULL;
700         ps->ifclaimed = 0;
701         security_task_getsecid(current, &ps->secid);
702         smp_wmb();
703         list_add_tail(&ps->list, &dev->filelist);
704         file->private_data = ps;
705         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
706                         current->comm);
707  out:
708         if (ret) {
709                 kfree(ps);
710                 usb_put_dev(dev);
711         }
712         mutex_unlock(&usbfs_mutex);
713         unlock_kernel();
714         return ret;
715 }
716
717 static int usbdev_release(struct inode *inode, struct file *file)
718 {
719         struct dev_state *ps = file->private_data;
720         struct usb_device *dev = ps->dev;
721         unsigned int ifnum;
722         struct async *as;
723
724         usb_lock_device(dev);
725         usb_hub_release_all_ports(dev, ps);
726
727         /* Protect against simultaneous open */
728         mutex_lock(&usbfs_mutex);
729         list_del_init(&ps->list);
730         mutex_unlock(&usbfs_mutex);
731
732         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
733                         ifnum++) {
734                 if (test_bit(ifnum, &ps->ifclaimed))
735                         releaseintf(ps, ifnum);
736         }
737         destroy_all_async(ps);
738         usb_autosuspend_device(dev);
739         usb_unlock_device(dev);
740         usb_put_dev(dev);
741         put_pid(ps->disc_pid);
742
743         as = async_getcompleted(ps);
744         while (as) {
745                 free_async(as);
746                 as = async_getcompleted(ps);
747         }
748         kfree(ps);
749         return 0;
750 }
751
752 static int proc_control(struct dev_state *ps, void __user *arg)
753 {
754         struct usb_device *dev = ps->dev;
755         struct usbdevfs_ctrltransfer ctrl;
756         unsigned int tmo;
757         unsigned char *tbuf;
758         unsigned wLength;
759         int i, pipe, ret;
760
761         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
762                 return -EFAULT;
763         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
764         if (ret)
765                 return ret;
766         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
767         if (wLength > PAGE_SIZE)
768                 return -EINVAL;
769         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
770         if (!tbuf)
771                 return -ENOMEM;
772         tmo = ctrl.timeout;
773         if (ctrl.bRequestType & 0x80) {
774                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
775                                                ctrl.wLength)) {
776                         free_page((unsigned long)tbuf);
777                         return -EINVAL;
778                 }
779                 pipe = usb_rcvctrlpipe(dev, 0);
780                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
781
782                 usb_unlock_device(dev);
783                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
784                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
785                                     tbuf, ctrl.wLength, tmo);
786                 usb_lock_device(dev);
787                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
788
789                 if ((i > 0) && ctrl.wLength) {
790                         if (copy_to_user(ctrl.data, tbuf, i)) {
791                                 free_page((unsigned long)tbuf);
792                                 return -EFAULT;
793                         }
794                 }
795         } else {
796                 if (ctrl.wLength) {
797                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
798                                 free_page((unsigned long)tbuf);
799                                 return -EFAULT;
800                         }
801                 }
802                 pipe = usb_sndctrlpipe(dev, 0);
803                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT);
804
805                 usb_unlock_device(dev);
806                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
807                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
808                                     tbuf, ctrl.wLength, tmo);
809                 usb_lock_device(dev);
810                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE);
811         }
812         free_page((unsigned long)tbuf);
813         if (i < 0 && i != -EPIPE) {
814                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
815                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
816                            current->comm, ctrl.bRequestType, ctrl.bRequest,
817                            ctrl.wLength, i);
818         }
819         return i;
820 }
821
822 static int proc_bulk(struct dev_state *ps, void __user *arg)
823 {
824         struct usb_device *dev = ps->dev;
825         struct usbdevfs_bulktransfer bulk;
826         unsigned int tmo, len1, pipe;
827         int len2;
828         unsigned char *tbuf;
829         int i, ret;
830
831         if (copy_from_user(&bulk, arg, sizeof(bulk)))
832                 return -EFAULT;
833         ret = findintfep(ps->dev, bulk.ep);
834         if (ret < 0)
835                 return ret;
836         ret = checkintf(ps, ret);
837         if (ret)
838                 return ret;
839         if (bulk.ep & USB_DIR_IN)
840                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
841         else
842                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
843         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
844                 return -EINVAL;
845         len1 = bulk.len;
846         if (len1 > MAX_USBFS_BUFFER_SIZE)
847                 return -EINVAL;
848         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
849                 return -ENOMEM;
850         tmo = bulk.timeout;
851         if (bulk.ep & 0x80) {
852                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
853                         kfree(tbuf);
854                         return -EINVAL;
855                 }
856                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
857
858                 usb_unlock_device(dev);
859                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
860                 usb_lock_device(dev);
861                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
862
863                 if (!i && len2) {
864                         if (copy_to_user(bulk.data, tbuf, len2)) {
865                                 kfree(tbuf);
866                                 return -EFAULT;
867                         }
868                 }
869         } else {
870                 if (len1) {
871                         if (copy_from_user(tbuf, bulk.data, len1)) {
872                                 kfree(tbuf);
873                                 return -EFAULT;
874                         }
875                 }
876                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT);
877
878                 usb_unlock_device(dev);
879                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
880                 usb_lock_device(dev);
881                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE);
882         }
883         kfree(tbuf);
884         if (i < 0)
885                 return i;
886         return len2;
887 }
888
889 static int proc_resetep(struct dev_state *ps, void __user *arg)
890 {
891         unsigned int ep;
892         int ret;
893
894         if (get_user(ep, (unsigned int __user *)arg))
895                 return -EFAULT;
896         ret = findintfep(ps->dev, ep);
897         if (ret < 0)
898                 return ret;
899         ret = checkintf(ps, ret);
900         if (ret)
901                 return ret;
902         usb_reset_endpoint(ps->dev, ep);
903         return 0;
904 }
905
906 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
907 {
908         unsigned int ep;
909         int pipe;
910         int ret;
911
912         if (get_user(ep, (unsigned int __user *)arg))
913                 return -EFAULT;
914         ret = findintfep(ps->dev, ep);
915         if (ret < 0)
916                 return ret;
917         ret = checkintf(ps, ret);
918         if (ret)
919                 return ret;
920         if (ep & USB_DIR_IN)
921                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
922         else
923                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
924
925         return usb_clear_halt(ps->dev, pipe);
926 }
927
928 static int proc_getdriver(struct dev_state *ps, void __user *arg)
929 {
930         struct usbdevfs_getdriver gd;
931         struct usb_interface *intf;
932         int ret;
933
934         if (copy_from_user(&gd, arg, sizeof(gd)))
935                 return -EFAULT;
936         intf = usb_ifnum_to_if(ps->dev, gd.interface);
937         if (!intf || !intf->dev.driver)
938                 ret = -ENODATA;
939         else {
940                 strncpy(gd.driver, intf->dev.driver->name,
941                                 sizeof(gd.driver));
942                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
943         }
944         return ret;
945 }
946
947 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
948 {
949         struct usbdevfs_connectinfo ci;
950
951         ci.devnum = ps->dev->devnum;
952         ci.slow = ps->dev->speed == USB_SPEED_LOW;
953         if (copy_to_user(arg, &ci, sizeof(ci)))
954                 return -EFAULT;
955         return 0;
956 }
957
958 static int proc_resetdevice(struct dev_state *ps)
959 {
960         return usb_reset_device(ps->dev);
961 }
962
963 static int proc_setintf(struct dev_state *ps, void __user *arg)
964 {
965         struct usbdevfs_setinterface setintf;
966         int ret;
967
968         if (copy_from_user(&setintf, arg, sizeof(setintf)))
969                 return -EFAULT;
970         if ((ret = checkintf(ps, setintf.interface)))
971                 return ret;
972         return usb_set_interface(ps->dev, setintf.interface,
973                         setintf.altsetting);
974 }
975
976 static int proc_setconfig(struct dev_state *ps, void __user *arg)
977 {
978         int u;
979         int status = 0;
980         struct usb_host_config *actconfig;
981
982         if (get_user(u, (int __user *)arg))
983                 return -EFAULT;
984
985         actconfig = ps->dev->actconfig;
986
987         /* Don't touch the device if any interfaces are claimed.
988          * It could interfere with other drivers' operations, and if
989          * an interface is claimed by usbfs it could easily deadlock.
990          */
991         if (actconfig) {
992                 int i;
993
994                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
995                         if (usb_interface_claimed(actconfig->interface[i])) {
996                                 dev_warn(&ps->dev->dev,
997                                         "usbfs: interface %d claimed by %s "
998                                         "while '%s' sets config #%d\n",
999                                         actconfig->interface[i]
1000                                                 ->cur_altsetting
1001                                                 ->desc.bInterfaceNumber,
1002                                         actconfig->interface[i]
1003                                                 ->dev.driver->name,
1004                                         current->comm, u);
1005                                 status = -EBUSY;
1006                                 break;
1007                         }
1008                 }
1009         }
1010
1011         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1012          * so avoid usb_set_configuration()'s kick to sysfs
1013          */
1014         if (status == 0) {
1015                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1016                         status = usb_reset_configuration(ps->dev);
1017                 else
1018                         status = usb_set_configuration(ps->dev, u);
1019         }
1020
1021         return status;
1022 }
1023
1024 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1025                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1026                         void __user *arg)
1027 {
1028         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1029         struct usb_host_endpoint *ep;
1030         struct async *as;
1031         struct usb_ctrlrequest *dr = NULL;
1032         const struct cred *cred = current_cred();
1033         unsigned int u, totlen, isofrmlen;
1034         int ret, ifnum = -1;
1035         int is_in;
1036
1037         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1038                                 USBDEVFS_URB_SHORT_NOT_OK |
1039                                 USBDEVFS_URB_BULK_CONTINUATION |
1040                                 USBDEVFS_URB_NO_FSBR |
1041                                 USBDEVFS_URB_ZERO_PACKET |
1042                                 USBDEVFS_URB_NO_INTERRUPT))
1043                 return -EINVAL;
1044         if (uurb->buffer_length > 0 && !uurb->buffer)
1045                 return -EINVAL;
1046         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1047             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1048                 ifnum = findintfep(ps->dev, uurb->endpoint);
1049                 if (ifnum < 0)
1050                         return ifnum;
1051                 ret = checkintf(ps, ifnum);
1052                 if (ret)
1053                         return ret;
1054         }
1055         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1056                 is_in = 1;
1057                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1058         } else {
1059                 is_in = 0;
1060                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1061         }
1062         if (!ep)
1063                 return -ENOENT;
1064         switch(uurb->type) {
1065         case USBDEVFS_URB_TYPE_CONTROL:
1066                 if (!usb_endpoint_xfer_control(&ep->desc))
1067                         return -EINVAL;
1068                 /* min 8 byte setup packet,
1069                  * max 8 byte setup plus an arbitrary data stage */
1070                 if (uurb->buffer_length < 8 ||
1071                     uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1072                         return -EINVAL;
1073                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1074                 if (!dr)
1075                         return -ENOMEM;
1076                 if (copy_from_user(dr, uurb->buffer, 8)) {
1077                         kfree(dr);
1078                         return -EFAULT;
1079                 }
1080                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1081                         kfree(dr);
1082                         return -EINVAL;
1083                 }
1084                 ret = check_ctrlrecip(ps, dr->bRequestType,
1085                                       le16_to_cpup(&dr->wIndex));
1086                 if (ret) {
1087                         kfree(dr);
1088                         return ret;
1089                 }
1090                 uurb->number_of_packets = 0;
1091                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1092                 uurb->buffer += 8;
1093                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1094                         is_in = 1;
1095                         uurb->endpoint |= USB_DIR_IN;
1096                 } else {
1097                         is_in = 0;
1098                         uurb->endpoint &= ~USB_DIR_IN;
1099                 }
1100                 break;
1101
1102         case USBDEVFS_URB_TYPE_BULK:
1103                 switch (usb_endpoint_type(&ep->desc)) {
1104                 case USB_ENDPOINT_XFER_CONTROL:
1105                 case USB_ENDPOINT_XFER_ISOC:
1106                         return -EINVAL;
1107                 /* allow single-shot interrupt transfers, at bogus rates */
1108                 }
1109                 uurb->number_of_packets = 0;
1110                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1111                         return -EINVAL;
1112                 break;
1113
1114         case USBDEVFS_URB_TYPE_ISO:
1115                 /* arbitrary limit */
1116                 if (uurb->number_of_packets < 1 ||
1117                     uurb->number_of_packets > 128)
1118                         return -EINVAL;
1119                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1120                         return -EINVAL;
1121                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1122                                    uurb->number_of_packets;
1123                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1124                         return -ENOMEM;
1125                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1126                         kfree(isopkt);
1127                         return -EFAULT;
1128                 }
1129                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1130                         /* arbitrary limit,
1131                          * sufficient for USB 2.0 high-bandwidth iso */
1132                         if (isopkt[u].length > 8192) {
1133                                 kfree(isopkt);
1134                                 return -EINVAL;
1135                         }
1136                         totlen += isopkt[u].length;
1137                 }
1138                 /* 3072 * 64 microframes */
1139                 if (totlen > 196608) {
1140                         kfree(isopkt);
1141                         return -EINVAL;
1142                 }
1143                 uurb->buffer_length = totlen;
1144                 break;
1145
1146         case USBDEVFS_URB_TYPE_INTERRUPT:
1147                 uurb->number_of_packets = 0;
1148                 if (!usb_endpoint_xfer_int(&ep->desc))
1149                         return -EINVAL;
1150                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1151                         return -EINVAL;
1152                 break;
1153
1154         default:
1155                 return -EINVAL;
1156         }
1157         if (uurb->buffer_length > 0 &&
1158                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1159                                 uurb->buffer, uurb->buffer_length)) {
1160                 kfree(isopkt);
1161                 kfree(dr);
1162                 return -EFAULT;
1163         }
1164         as = alloc_async(uurb->number_of_packets);
1165         if (!as) {
1166                 kfree(isopkt);
1167                 kfree(dr);
1168                 return -ENOMEM;
1169         }
1170         if (uurb->buffer_length > 0) {
1171                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1172                                 GFP_KERNEL);
1173                 if (!as->urb->transfer_buffer) {
1174                         kfree(isopkt);
1175                         kfree(dr);
1176                         free_async(as);
1177                         return -ENOMEM;
1178                 }
1179         }
1180         as->urb->dev = ps->dev;
1181         as->urb->pipe = (uurb->type << 30) |
1182                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1183                         (uurb->endpoint & USB_DIR_IN);
1184
1185         /* This tedious sequence is necessary because the URB_* flags
1186          * are internal to the kernel and subject to change, whereas
1187          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1188          */
1189         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1190         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1191                 u |= URB_ISO_ASAP;
1192         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1193                 u |= URB_SHORT_NOT_OK;
1194         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1195                 u |= URB_NO_FSBR;
1196         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1197                 u |= URB_ZERO_PACKET;
1198         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1199                 u |= URB_NO_INTERRUPT;
1200         as->urb->transfer_flags = u;
1201
1202         as->urb->transfer_buffer_length = uurb->buffer_length;
1203         as->urb->setup_packet = (unsigned char *)dr;
1204         as->urb->start_frame = uurb->start_frame;
1205         as->urb->number_of_packets = uurb->number_of_packets;
1206         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1207                         ps->dev->speed == USB_SPEED_HIGH)
1208                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1209         else
1210                 as->urb->interval = ep->desc.bInterval;
1211         as->urb->context = as;
1212         as->urb->complete = async_completed;
1213         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1214                 as->urb->iso_frame_desc[u].offset = totlen;
1215                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1216                 totlen += isopkt[u].length;
1217         }
1218         kfree(isopkt);
1219         as->ps = ps;
1220         as->userurb = arg;
1221         if (is_in && uurb->buffer_length > 0)
1222                 as->userbuffer = uurb->buffer;
1223         else
1224                 as->userbuffer = NULL;
1225         as->signr = uurb->signr;
1226         as->ifnum = ifnum;
1227         as->pid = get_pid(task_pid(current));
1228         as->uid = cred->uid;
1229         as->euid = cred->euid;
1230         security_task_getsecid(current, &as->secid);
1231         if (!is_in && uurb->buffer_length > 0) {
1232                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1233                                 uurb->buffer_length)) {
1234                         free_async(as);
1235                         return -EFAULT;
1236                 }
1237         }
1238         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1239                         as->urb->transfer_buffer_length, 0, SUBMIT);
1240         async_newpending(as);
1241
1242         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1243                 spin_lock_irq(&ps->lock);
1244
1245                 /* Not exactly the endpoint address; the direction bit is
1246                  * shifted to the 0x10 position so that the value will be
1247                  * between 0 and 31.
1248                  */
1249                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1250                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1251                                 >> 3);
1252
1253                 /* If this bulk URB is the start of a new transfer, re-enable
1254                  * the endpoint.  Otherwise mark it as a continuation URB.
1255                  */
1256                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1257                         as->bulk_status = AS_CONTINUATION;
1258                 else
1259                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1260
1261                 /* Don't accept continuation URBs if the endpoint is
1262                  * disabled because of an earlier error.
1263                  */
1264                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1265                         ret = -EREMOTEIO;
1266                 else
1267                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1268                 spin_unlock_irq(&ps->lock);
1269         } else {
1270                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1271         }
1272
1273         if (ret) {
1274                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1275                            "usbfs: usb_submit_urb returned %d\n", ret);
1276                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1277                                 0, ret, COMPLETE);
1278                 async_removepending(as);
1279                 free_async(as);
1280                 return ret;
1281         }
1282         return 0;
1283 }
1284
1285 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1286 {
1287         struct usbdevfs_urb uurb;
1288
1289         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1290                 return -EFAULT;
1291
1292         return proc_do_submiturb(ps, &uurb,
1293                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1294                         arg);
1295 }
1296
1297 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1298 {
1299         struct async *as;
1300
1301         as = async_getpending(ps, arg);
1302         if (!as)
1303                 return -EINVAL;
1304         usb_kill_urb(as->urb);
1305         return 0;
1306 }
1307
1308 static int processcompl(struct async *as, void __user * __user *arg)
1309 {
1310         struct urb *urb = as->urb;
1311         struct usbdevfs_urb __user *userurb = as->userurb;
1312         void __user *addr = as->userurb;
1313         unsigned int i;
1314
1315         if (as->userbuffer && urb->actual_length)
1316                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1317                                  urb->actual_length))
1318                         goto err_out;
1319         if (put_user(as->status, &userurb->status))
1320                 goto err_out;
1321         if (put_user(urb->actual_length, &userurb->actual_length))
1322                 goto err_out;
1323         if (put_user(urb->error_count, &userurb->error_count))
1324                 goto err_out;
1325
1326         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1327                 for (i = 0; i < urb->number_of_packets; i++) {
1328                         if (put_user(urb->iso_frame_desc[i].actual_length,
1329                                      &userurb->iso_frame_desc[i].actual_length))
1330                                 goto err_out;
1331                         if (put_user(urb->iso_frame_desc[i].status,
1332                                      &userurb->iso_frame_desc[i].status))
1333                                 goto err_out;
1334                 }
1335         }
1336
1337         if (put_user(addr, (void __user * __user *)arg))
1338                 return -EFAULT;
1339         return 0;
1340
1341 err_out:
1342         return -EFAULT;
1343 }
1344
1345 static struct async *reap_as(struct dev_state *ps)
1346 {
1347         DECLARE_WAITQUEUE(wait, current);
1348         struct async *as = NULL;
1349         struct usb_device *dev = ps->dev;
1350
1351         add_wait_queue(&ps->wait, &wait);
1352         for (;;) {
1353                 __set_current_state(TASK_INTERRUPTIBLE);
1354                 as = async_getcompleted(ps);
1355                 if (as)
1356                         break;
1357                 if (signal_pending(current))
1358                         break;
1359                 usb_unlock_device(dev);
1360                 schedule();
1361                 usb_lock_device(dev);
1362         }
1363         remove_wait_queue(&ps->wait, &wait);
1364         set_current_state(TASK_RUNNING);
1365         return as;
1366 }
1367
1368 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1369 {
1370         struct async *as = reap_as(ps);
1371         if (as) {
1372                 int retval = processcompl(as, (void __user * __user *)arg);
1373                 free_async(as);
1374                 return retval;
1375         }
1376         if (signal_pending(current))
1377                 return -EINTR;
1378         return -EIO;
1379 }
1380
1381 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1382 {
1383         int retval;
1384         struct async *as;
1385
1386         as = async_getcompleted(ps);
1387         retval = -EAGAIN;
1388         if (as) {
1389                 retval = processcompl(as, (void __user * __user *)arg);
1390                 free_async(as);
1391         }
1392         return retval;
1393 }
1394
1395 #ifdef CONFIG_COMPAT
1396 static int proc_control_compat(struct dev_state *ps,
1397                                 struct usbdevfs_ctrltransfer32 __user *p32)
1398 {
1399         struct usbdevfs_ctrltransfer __user *p;
1400         __u32 udata;
1401         p = compat_alloc_user_space(sizeof(*p));
1402         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1403             get_user(udata, &p32->data) ||
1404             put_user(compat_ptr(udata), &p->data))
1405                 return -EFAULT;
1406         return proc_control(ps, p);
1407 }
1408
1409 static int proc_bulk_compat(struct dev_state *ps,
1410                         struct usbdevfs_bulktransfer32 __user *p32)
1411 {
1412         struct usbdevfs_bulktransfer __user *p;
1413         compat_uint_t n;
1414         compat_caddr_t addr;
1415
1416         p = compat_alloc_user_space(sizeof(*p));
1417
1418         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1419             get_user(n, &p32->len) || put_user(n, &p->len) ||
1420             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1421             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1422                 return -EFAULT;
1423
1424         return proc_bulk(ps, p);
1425 }
1426 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1427 {
1428         struct usbdevfs_disconnectsignal32 ds;
1429
1430         if (copy_from_user(&ds, arg, sizeof(ds)))
1431                 return -EFAULT;
1432         ps->discsignr = ds.signr;
1433         ps->disccontext = compat_ptr(ds.context);
1434         return 0;
1435 }
1436
1437 static int get_urb32(struct usbdevfs_urb *kurb,
1438                      struct usbdevfs_urb32 __user *uurb)
1439 {
1440         __u32  uptr;
1441         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1442             __get_user(kurb->type, &uurb->type) ||
1443             __get_user(kurb->endpoint, &uurb->endpoint) ||
1444             __get_user(kurb->status, &uurb->status) ||
1445             __get_user(kurb->flags, &uurb->flags) ||
1446             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1447             __get_user(kurb->actual_length, &uurb->actual_length) ||
1448             __get_user(kurb->start_frame, &uurb->start_frame) ||
1449             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1450             __get_user(kurb->error_count, &uurb->error_count) ||
1451             __get_user(kurb->signr, &uurb->signr))
1452                 return -EFAULT;
1453
1454         if (__get_user(uptr, &uurb->buffer))
1455                 return -EFAULT;
1456         kurb->buffer = compat_ptr(uptr);
1457         if (__get_user(uptr, &uurb->usercontext))
1458                 return -EFAULT;
1459         kurb->usercontext = compat_ptr(uptr);
1460
1461         return 0;
1462 }
1463
1464 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1465 {
1466         struct usbdevfs_urb uurb;
1467
1468         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1469                 return -EFAULT;
1470
1471         return proc_do_submiturb(ps, &uurb,
1472                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1473                         arg);
1474 }
1475
1476 static int processcompl_compat(struct async *as, void __user * __user *arg)
1477 {
1478         struct urb *urb = as->urb;
1479         struct usbdevfs_urb32 __user *userurb = as->userurb;
1480         void __user *addr = as->userurb;
1481         unsigned int i;
1482
1483         if (as->userbuffer && urb->actual_length)
1484                 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1485                                  urb->actual_length))
1486                         return -EFAULT;
1487         if (put_user(as->status, &userurb->status))
1488                 return -EFAULT;
1489         if (put_user(urb->actual_length, &userurb->actual_length))
1490                 return -EFAULT;
1491         if (put_user(urb->error_count, &userurb->error_count))
1492                 return -EFAULT;
1493
1494         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1495                 for (i = 0; i < urb->number_of_packets; i++) {
1496                         if (put_user(urb->iso_frame_desc[i].actual_length,
1497                                      &userurb->iso_frame_desc[i].actual_length))
1498                                 return -EFAULT;
1499                         if (put_user(urb->iso_frame_desc[i].status,
1500                                      &userurb->iso_frame_desc[i].status))
1501                                 return -EFAULT;
1502                 }
1503         }
1504
1505         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1506                 return -EFAULT;
1507         return 0;
1508 }
1509
1510 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1511 {
1512         struct async *as = reap_as(ps);
1513         if (as) {
1514                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1515                 free_async(as);
1516                 return retval;
1517         }
1518         if (signal_pending(current))
1519                 return -EINTR;
1520         return -EIO;
1521 }
1522
1523 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1524 {
1525         int retval;
1526         struct async *as;
1527
1528         retval = -EAGAIN;
1529         as = async_getcompleted(ps);
1530         if (as) {
1531                 retval = processcompl_compat(as, (void __user * __user *)arg);
1532                 free_async(as);
1533         }
1534         return retval;
1535 }
1536
1537
1538 #endif
1539
1540 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1541 {
1542         struct usbdevfs_disconnectsignal ds;
1543
1544         if (copy_from_user(&ds, arg, sizeof(ds)))
1545                 return -EFAULT;
1546         ps->discsignr = ds.signr;
1547         ps->disccontext = ds.context;
1548         return 0;
1549 }
1550
1551 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1552 {
1553         unsigned int ifnum;
1554
1555         if (get_user(ifnum, (unsigned int __user *)arg))
1556                 return -EFAULT;
1557         return claimintf(ps, ifnum);
1558 }
1559
1560 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1561 {
1562         unsigned int ifnum;
1563         int ret;
1564
1565         if (get_user(ifnum, (unsigned int __user *)arg))
1566                 return -EFAULT;
1567         if ((ret = releaseintf(ps, ifnum)) < 0)
1568                 return ret;
1569         destroy_async_on_interface (ps, ifnum);
1570         return 0;
1571 }
1572
1573 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1574 {
1575         int                     size;
1576         void                    *buf = NULL;
1577         int                     retval = 0;
1578         struct usb_interface    *intf = NULL;
1579         struct usb_driver       *driver = NULL;
1580
1581         /* alloc buffer */
1582         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1583                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1584                         return -ENOMEM;
1585                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1586                         if (copy_from_user(buf, ctl->data, size)) {
1587                                 kfree(buf);
1588                                 return -EFAULT;
1589                         }
1590                 } else {
1591                         memset(buf, 0, size);
1592                 }
1593         }
1594
1595         if (!connected(ps)) {
1596                 kfree(buf);
1597                 return -ENODEV;
1598         }
1599
1600         if (ps->dev->state != USB_STATE_CONFIGURED)
1601                 retval = -EHOSTUNREACH;
1602         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1603                 retval = -EINVAL;
1604         else switch (ctl->ioctl_code) {
1605
1606         /* disconnect kernel driver from interface */
1607         case USBDEVFS_DISCONNECT:
1608                 if (intf->dev.driver) {
1609                         driver = to_usb_driver(intf->dev.driver);
1610                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1611                         usb_driver_release_interface(driver, intf);
1612                 } else
1613                         retval = -ENODATA;
1614                 break;
1615
1616         /* let kernel drivers try to (re)bind to the interface */
1617         case USBDEVFS_CONNECT:
1618                 if (!intf->dev.driver)
1619                         retval = device_attach(&intf->dev);
1620                 else
1621                         retval = -EBUSY;
1622                 break;
1623
1624         /* talk directly to the interface's driver */
1625         default:
1626                 if (intf->dev.driver)
1627                         driver = to_usb_driver(intf->dev.driver);
1628                 if (driver == NULL || driver->ioctl == NULL) {
1629                         retval = -ENOTTY;
1630                 } else {
1631                         retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1632                         if (retval == -ENOIOCTLCMD)
1633                                 retval = -ENOTTY;
1634                 }
1635         }
1636
1637         /* cleanup and return */
1638         if (retval >= 0
1639                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1640                         && size > 0
1641                         && copy_to_user(ctl->data, buf, size) != 0)
1642                 retval = -EFAULT;
1643
1644         kfree(buf);
1645         return retval;
1646 }
1647
1648 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1649 {
1650         struct usbdevfs_ioctl   ctrl;
1651
1652         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1653                 return -EFAULT;
1654         return proc_ioctl(ps, &ctrl);
1655 }
1656
1657 #ifdef CONFIG_COMPAT
1658 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1659 {
1660         struct usbdevfs_ioctl32 __user *uioc;
1661         struct usbdevfs_ioctl ctrl;
1662         u32 udata;
1663
1664         uioc = compat_ptr((long)arg);
1665         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1666             __get_user(ctrl.ifno, &uioc->ifno) ||
1667             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1668             __get_user(udata, &uioc->data))
1669                 return -EFAULT;
1670         ctrl.data = compat_ptr(udata);
1671
1672         return proc_ioctl(ps, &ctrl);
1673 }
1674 #endif
1675
1676 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1677 {
1678         unsigned portnum;
1679         int rc;
1680
1681         if (get_user(portnum, (unsigned __user *) arg))
1682                 return -EFAULT;
1683         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1684         if (rc == 0)
1685                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1686                         portnum, task_pid_nr(current), current->comm);
1687         return rc;
1688 }
1689
1690 static int proc_release_port(struct dev_state *ps, void __user *arg)
1691 {
1692         unsigned portnum;
1693
1694         if (get_user(portnum, (unsigned __user *) arg))
1695                 return -EFAULT;
1696         return usb_hub_release_port(ps->dev, portnum, ps);
1697 }
1698
1699 /*
1700  * NOTE:  All requests here that have interface numbers as parameters
1701  * are assuming that somehow the configuration has been prevented from
1702  * changing.  But there's no mechanism to ensure that...
1703  */
1704 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1705                                 void __user *p)
1706 {
1707         struct dev_state *ps = file->private_data;
1708         struct inode *inode = file->f_path.dentry->d_inode;
1709         struct usb_device *dev = ps->dev;
1710         int ret = -ENOTTY;
1711
1712         if (!(file->f_mode & FMODE_WRITE))
1713                 return -EPERM;
1714         usb_lock_device(dev);
1715         if (!connected(ps)) {
1716                 usb_unlock_device(dev);
1717                 return -ENODEV;
1718         }
1719
1720         switch (cmd) {
1721         case USBDEVFS_CONTROL:
1722                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1723                 ret = proc_control(ps, p);
1724                 if (ret >= 0)
1725                         inode->i_mtime = CURRENT_TIME;
1726                 break;
1727
1728         case USBDEVFS_BULK:
1729                 snoop(&dev->dev, "%s: BULK\n", __func__);
1730                 ret = proc_bulk(ps, p);
1731                 if (ret >= 0)
1732                         inode->i_mtime = CURRENT_TIME;
1733                 break;
1734
1735         case USBDEVFS_RESETEP:
1736                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1737                 ret = proc_resetep(ps, p);
1738                 if (ret >= 0)
1739                         inode->i_mtime = CURRENT_TIME;
1740                 break;
1741
1742         case USBDEVFS_RESET:
1743                 snoop(&dev->dev, "%s: RESET\n", __func__);
1744                 ret = proc_resetdevice(ps);
1745                 break;
1746
1747         case USBDEVFS_CLEAR_HALT:
1748                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1749                 ret = proc_clearhalt(ps, p);
1750                 if (ret >= 0)
1751                         inode->i_mtime = CURRENT_TIME;
1752                 break;
1753
1754         case USBDEVFS_GETDRIVER:
1755                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1756                 ret = proc_getdriver(ps, p);
1757                 break;
1758
1759         case USBDEVFS_CONNECTINFO:
1760                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1761                 ret = proc_connectinfo(ps, p);
1762                 break;
1763
1764         case USBDEVFS_SETINTERFACE:
1765                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1766                 ret = proc_setintf(ps, p);
1767                 break;
1768
1769         case USBDEVFS_SETCONFIGURATION:
1770                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1771                 ret = proc_setconfig(ps, p);
1772                 break;
1773
1774         case USBDEVFS_SUBMITURB:
1775                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1776                 ret = proc_submiturb(ps, p);
1777                 if (ret >= 0)
1778                         inode->i_mtime = CURRENT_TIME;
1779                 break;
1780
1781 #ifdef CONFIG_COMPAT
1782         case USBDEVFS_CONTROL32:
1783                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1784                 ret = proc_control_compat(ps, p);
1785                 if (ret >= 0)
1786                         inode->i_mtime = CURRENT_TIME;
1787                 break;
1788
1789         case USBDEVFS_BULK32:
1790                 snoop(&dev->dev, "%s: BULK32\n", __func__);
1791                 ret = proc_bulk_compat(ps, p);
1792                 if (ret >= 0)
1793                         inode->i_mtime = CURRENT_TIME;
1794                 break;
1795
1796         case USBDEVFS_DISCSIGNAL32:
1797                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1798                 ret = proc_disconnectsignal_compat(ps, p);
1799                 break;
1800
1801         case USBDEVFS_SUBMITURB32:
1802                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1803                 ret = proc_submiturb_compat(ps, p);
1804                 if (ret >= 0)
1805                         inode->i_mtime = CURRENT_TIME;
1806                 break;
1807
1808         case USBDEVFS_REAPURB32:
1809                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1810                 ret = proc_reapurb_compat(ps, p);
1811                 break;
1812
1813         case USBDEVFS_REAPURBNDELAY32:
1814                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1815                 ret = proc_reapurbnonblock_compat(ps, p);
1816                 break;
1817
1818         case USBDEVFS_IOCTL32:
1819                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1820                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1821                 break;
1822 #endif
1823
1824         case USBDEVFS_DISCARDURB:
1825                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1826                 ret = proc_unlinkurb(ps, p);
1827                 break;
1828
1829         case USBDEVFS_REAPURB:
1830                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1831                 ret = proc_reapurb(ps, p);
1832                 break;
1833
1834         case USBDEVFS_REAPURBNDELAY:
1835                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1836                 ret = proc_reapurbnonblock(ps, p);
1837                 break;
1838
1839         case USBDEVFS_DISCSIGNAL:
1840                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1841                 ret = proc_disconnectsignal(ps, p);
1842                 break;
1843
1844         case USBDEVFS_CLAIMINTERFACE:
1845                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1846                 ret = proc_claiminterface(ps, p);
1847                 break;
1848
1849         case USBDEVFS_RELEASEINTERFACE:
1850                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1851                 ret = proc_releaseinterface(ps, p);
1852                 break;
1853
1854         case USBDEVFS_IOCTL:
1855                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1856                 ret = proc_ioctl_default(ps, p);
1857                 break;
1858
1859         case USBDEVFS_CLAIM_PORT:
1860                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1861                 ret = proc_claim_port(ps, p);
1862                 break;
1863
1864         case USBDEVFS_RELEASE_PORT:
1865                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1866                 ret = proc_release_port(ps, p);
1867                 break;
1868         }
1869         usb_unlock_device(dev);
1870         if (ret >= 0)
1871                 inode->i_atime = CURRENT_TIME;
1872         return ret;
1873 }
1874
1875 static long usbdev_ioctl(struct file *file, unsigned int cmd,
1876                         unsigned long arg)
1877 {
1878         int ret;
1879
1880         lock_kernel();
1881         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1882         unlock_kernel();
1883
1884         return ret;
1885 }
1886
1887 #ifdef CONFIG_COMPAT
1888 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1889                         unsigned long arg)
1890 {
1891         int ret;
1892
1893         lock_kernel();
1894         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1895         unlock_kernel();
1896
1897         return ret;
1898 }
1899 #endif
1900
1901 /* No kernel lock - fine */
1902 static unsigned int usbdev_poll(struct file *file,
1903                                 struct poll_table_struct *wait)
1904 {
1905         struct dev_state *ps = file->private_data;
1906         unsigned int mask = 0;
1907
1908         poll_wait(file, &ps->wait, wait);
1909         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1910                 mask |= POLLOUT | POLLWRNORM;
1911         if (!connected(ps))
1912                 mask |= POLLERR | POLLHUP;
1913         return mask;
1914 }
1915
1916 const struct file_operations usbdev_file_operations = {
1917         .owner =          THIS_MODULE,
1918         .llseek =         usbdev_lseek,
1919         .read =           usbdev_read,
1920         .poll =           usbdev_poll,
1921         .unlocked_ioctl = usbdev_ioctl,
1922 #ifdef CONFIG_COMPAT
1923         .compat_ioctl =   usbdev_compat_ioctl,
1924 #endif
1925         .open =           usbdev_open,
1926         .release =        usbdev_release,
1927 };
1928
1929 static void usbdev_remove(struct usb_device *udev)
1930 {
1931         struct dev_state *ps;
1932         struct siginfo sinfo;
1933
1934         while (!list_empty(&udev->filelist)) {
1935                 ps = list_entry(udev->filelist.next, struct dev_state, list);
1936                 destroy_all_async(ps);
1937                 wake_up_all(&ps->wait);
1938                 list_del_init(&ps->list);
1939                 if (ps->discsignr) {
1940                         sinfo.si_signo = ps->discsignr;
1941                         sinfo.si_errno = EPIPE;
1942                         sinfo.si_code = SI_ASYNCIO;
1943                         sinfo.si_addr = ps->disccontext;
1944                         kill_pid_info_as_uid(ps->discsignr, &sinfo,
1945                                         ps->disc_pid, ps->disc_uid,
1946                                         ps->disc_euid, ps->secid);
1947                 }
1948         }
1949 }
1950
1951 #ifdef CONFIG_USB_DEVICE_CLASS
1952 static struct class *usb_classdev_class;
1953
1954 static int usb_classdev_add(struct usb_device *dev)
1955 {
1956         struct device *cldev;
1957
1958         cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1959                               NULL, "usbdev%d.%d", dev->bus->busnum,
1960                               dev->devnum);
1961         if (IS_ERR(cldev))
1962                 return PTR_ERR(cldev);
1963         dev->usb_classdev = cldev;
1964         return 0;
1965 }
1966
1967 static void usb_classdev_remove(struct usb_device *dev)
1968 {
1969         if (dev->usb_classdev)
1970                 device_unregister(dev->usb_classdev);
1971 }
1972
1973 #else
1974 #define usb_classdev_add(dev)           0
1975 #define usb_classdev_remove(dev)        do {} while (0)
1976
1977 #endif
1978
1979 static int usbdev_notify(struct notifier_block *self,
1980                                unsigned long action, void *dev)
1981 {
1982         switch (action) {
1983         case USB_DEVICE_ADD:
1984                 if (usb_classdev_add(dev))
1985                         return NOTIFY_BAD;
1986                 break;
1987         case USB_DEVICE_REMOVE:
1988                 usb_classdev_remove(dev);
1989                 usbdev_remove(dev);
1990                 break;
1991         }
1992         return NOTIFY_OK;
1993 }
1994
1995 static struct notifier_block usbdev_nb = {
1996         .notifier_call =        usbdev_notify,
1997 };
1998
1999 static struct cdev usb_device_cdev;
2000
2001 int __init usb_devio_init(void)
2002 {
2003         int retval;
2004
2005         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2006                                         "usb_device");
2007         if (retval) {
2008                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2009                 goto out;
2010         }
2011         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2012         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2013         if (retval) {
2014                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2015                        USB_DEVICE_MAJOR);
2016                 goto error_cdev;
2017         }
2018 #ifdef CONFIG_USB_DEVICE_CLASS
2019         usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2020         if (IS_ERR(usb_classdev_class)) {
2021                 printk(KERN_ERR "Unable to register usb_device class\n");
2022                 retval = PTR_ERR(usb_classdev_class);
2023                 cdev_del(&usb_device_cdev);
2024                 usb_classdev_class = NULL;
2025                 goto out;
2026         }
2027         /* devices of this class shadow the major:minor of their parent
2028          * device, so clear ->dev_kobj to prevent adding duplicate entries
2029          * to /sys/dev
2030          */
2031         usb_classdev_class->dev_kobj = NULL;
2032 #endif
2033         usb_register_notify(&usbdev_nb);
2034 out:
2035         return retval;
2036
2037 error_cdev:
2038         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2039         goto out;
2040 }
2041
2042 void usb_devio_cleanup(void)
2043 {
2044         usb_unregister_notify(&usbdev_nb);
2045 #ifdef CONFIG_USB_DEVICE_CLASS
2046         class_destroy(usb_classdev_class);
2047 #endif
2048         cdev_del(&usb_device_cdev);
2049         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2050 }