firewire: cdev: add more flexible cycle timer ioctl
[linux-2.6.git] / drivers / firewire / core-cdev.c
1 /*
2  * Char device for device raw access
3  *
4  * Copyright (C) 2005-2007  Kristian Hoegsberg <krh@bitplanet.net>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software Foundation,
18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19  */
20
21 #include <linux/compat.h>
22 #include <linux/delay.h>
23 #include <linux/device.h>
24 #include <linux/errno.h>
25 #include <linux/firewire.h>
26 #include <linux/firewire-cdev.h>
27 #include <linux/idr.h>
28 #include <linux/irqflags.h>
29 #include <linux/jiffies.h>
30 #include <linux/kernel.h>
31 #include <linux/kref.h>
32 #include <linux/mm.h>
33 #include <linux/module.h>
34 #include <linux/mutex.h>
35 #include <linux/poll.h>
36 #include <linux/sched.h>
37 #include <linux/spinlock.h>
38 #include <linux/string.h>
39 #include <linux/time.h>
40 #include <linux/uaccess.h>
41 #include <linux/vmalloc.h>
42 #include <linux/wait.h>
43 #include <linux/workqueue.h>
44
45 #include <asm/system.h>
46
47 #include "core.h"
48
49 struct client {
50         u32 version;
51         struct fw_device *device;
52
53         spinlock_t lock;
54         bool in_shutdown;
55         struct idr resource_idr;
56         struct list_head event_list;
57         wait_queue_head_t wait;
58         u64 bus_reset_closure;
59
60         struct fw_iso_context *iso_context;
61         u64 iso_closure;
62         struct fw_iso_buffer buffer;
63         unsigned long vm_start;
64
65         struct list_head link;
66         struct kref kref;
67 };
68
69 static inline void client_get(struct client *client)
70 {
71         kref_get(&client->kref);
72 }
73
74 static void client_release(struct kref *kref)
75 {
76         struct client *client = container_of(kref, struct client, kref);
77
78         fw_device_put(client->device);
79         kfree(client);
80 }
81
82 static void client_put(struct client *client)
83 {
84         kref_put(&client->kref, client_release);
85 }
86
87 struct client_resource;
88 typedef void (*client_resource_release_fn_t)(struct client *,
89                                              struct client_resource *);
90 struct client_resource {
91         client_resource_release_fn_t release;
92         int handle;
93 };
94
95 struct address_handler_resource {
96         struct client_resource resource;
97         struct fw_address_handler handler;
98         __u64 closure;
99         struct client *client;
100 };
101
102 struct outbound_transaction_resource {
103         struct client_resource resource;
104         struct fw_transaction transaction;
105 };
106
107 struct inbound_transaction_resource {
108         struct client_resource resource;
109         struct fw_request *request;
110         void *data;
111         size_t length;
112 };
113
114 struct descriptor_resource {
115         struct client_resource resource;
116         struct fw_descriptor descriptor;
117         u32 data[0];
118 };
119
120 struct iso_resource {
121         struct client_resource resource;
122         struct client *client;
123         /* Schedule work and access todo only with client->lock held. */
124         struct delayed_work work;
125         enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC,
126               ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo;
127         int generation;
128         u64 channels;
129         s32 bandwidth;
130         __be32 transaction_data[2];
131         struct iso_resource_event *e_alloc, *e_dealloc;
132 };
133
134 static void release_iso_resource(struct client *, struct client_resource *);
135
136 static void schedule_iso_resource(struct iso_resource *r, unsigned long delay)
137 {
138         client_get(r->client);
139         if (!schedule_delayed_work(&r->work, delay))
140                 client_put(r->client);
141 }
142
143 static void schedule_if_iso_resource(struct client_resource *resource)
144 {
145         if (resource->release == release_iso_resource)
146                 schedule_iso_resource(container_of(resource,
147                                         struct iso_resource, resource), 0);
148 }
149
150 /*
151  * dequeue_event() just kfree()'s the event, so the event has to be
152  * the first field in a struct XYZ_event.
153  */
154 struct event {
155         struct { void *data; size_t size; } v[2];
156         struct list_head link;
157 };
158
159 struct bus_reset_event {
160         struct event event;
161         struct fw_cdev_event_bus_reset reset;
162 };
163
164 struct outbound_transaction_event {
165         struct event event;
166         struct client *client;
167         struct outbound_transaction_resource r;
168         struct fw_cdev_event_response response;
169 };
170
171 struct inbound_transaction_event {
172         struct event event;
173         struct fw_cdev_event_request request;
174 };
175
176 struct iso_interrupt_event {
177         struct event event;
178         struct fw_cdev_event_iso_interrupt interrupt;
179 };
180
181 struct iso_resource_event {
182         struct event event;
183         struct fw_cdev_event_iso_resource iso_resource;
184 };
185
186 static inline void __user *u64_to_uptr(__u64 value)
187 {
188         return (void __user *)(unsigned long)value;
189 }
190
191 static inline __u64 uptr_to_u64(void __user *ptr)
192 {
193         return (__u64)(unsigned long)ptr;
194 }
195
196 static int fw_device_op_open(struct inode *inode, struct file *file)
197 {
198         struct fw_device *device;
199         struct client *client;
200
201         device = fw_device_get_by_devt(inode->i_rdev);
202         if (device == NULL)
203                 return -ENODEV;
204
205         if (fw_device_is_shutdown(device)) {
206                 fw_device_put(device);
207                 return -ENODEV;
208         }
209
210         client = kzalloc(sizeof(*client), GFP_KERNEL);
211         if (client == NULL) {
212                 fw_device_put(device);
213                 return -ENOMEM;
214         }
215
216         client->device = device;
217         spin_lock_init(&client->lock);
218         idr_init(&client->resource_idr);
219         INIT_LIST_HEAD(&client->event_list);
220         init_waitqueue_head(&client->wait);
221         kref_init(&client->kref);
222
223         file->private_data = client;
224
225         mutex_lock(&device->client_list_mutex);
226         list_add_tail(&client->link, &device->client_list);
227         mutex_unlock(&device->client_list_mutex);
228
229         return 0;
230 }
231
232 static void queue_event(struct client *client, struct event *event,
233                         void *data0, size_t size0, void *data1, size_t size1)
234 {
235         unsigned long flags;
236
237         event->v[0].data = data0;
238         event->v[0].size = size0;
239         event->v[1].data = data1;
240         event->v[1].size = size1;
241
242         spin_lock_irqsave(&client->lock, flags);
243         if (client->in_shutdown)
244                 kfree(event);
245         else
246                 list_add_tail(&event->link, &client->event_list);
247         spin_unlock_irqrestore(&client->lock, flags);
248
249         wake_up_interruptible(&client->wait);
250 }
251
252 static int dequeue_event(struct client *client,
253                          char __user *buffer, size_t count)
254 {
255         struct event *event;
256         size_t size, total;
257         int i, ret;
258
259         ret = wait_event_interruptible(client->wait,
260                         !list_empty(&client->event_list) ||
261                         fw_device_is_shutdown(client->device));
262         if (ret < 0)
263                 return ret;
264
265         if (list_empty(&client->event_list) &&
266                        fw_device_is_shutdown(client->device))
267                 return -ENODEV;
268
269         spin_lock_irq(&client->lock);
270         event = list_first_entry(&client->event_list, struct event, link);
271         list_del(&event->link);
272         spin_unlock_irq(&client->lock);
273
274         total = 0;
275         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
276                 size = min(event->v[i].size, count - total);
277                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
278                         ret = -EFAULT;
279                         goto out;
280                 }
281                 total += size;
282         }
283         ret = total;
284
285  out:
286         kfree(event);
287
288         return ret;
289 }
290
291 static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
292                                  size_t count, loff_t *offset)
293 {
294         struct client *client = file->private_data;
295
296         return dequeue_event(client, buffer, count);
297 }
298
299 static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
300                                  struct client *client)
301 {
302         struct fw_card *card = client->device->card;
303
304         spin_lock_irq(&card->lock);
305
306         event->closure       = client->bus_reset_closure;
307         event->type          = FW_CDEV_EVENT_BUS_RESET;
308         event->generation    = client->device->generation;
309         event->node_id       = client->device->node_id;
310         event->local_node_id = card->local_node->node_id;
311         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
312         event->irm_node_id   = card->irm_node->node_id;
313         event->root_node_id  = card->root_node->node_id;
314
315         spin_unlock_irq(&card->lock);
316 }
317
318 static void for_each_client(struct fw_device *device,
319                             void (*callback)(struct client *client))
320 {
321         struct client *c;
322
323         mutex_lock(&device->client_list_mutex);
324         list_for_each_entry(c, &device->client_list, link)
325                 callback(c);
326         mutex_unlock(&device->client_list_mutex);
327 }
328
329 static int schedule_reallocations(int id, void *p, void *data)
330 {
331         schedule_if_iso_resource(p);
332
333         return 0;
334 }
335
336 static void queue_bus_reset_event(struct client *client)
337 {
338         struct bus_reset_event *e;
339
340         e = kzalloc(sizeof(*e), GFP_KERNEL);
341         if (e == NULL) {
342                 fw_notify("Out of memory when allocating bus reset event\n");
343                 return;
344         }
345
346         fill_bus_reset_event(&e->reset, client);
347
348         queue_event(client, &e->event,
349                     &e->reset, sizeof(e->reset), NULL, 0);
350
351         spin_lock_irq(&client->lock);
352         idr_for_each(&client->resource_idr, schedule_reallocations, client);
353         spin_unlock_irq(&client->lock);
354 }
355
356 void fw_device_cdev_update(struct fw_device *device)
357 {
358         for_each_client(device, queue_bus_reset_event);
359 }
360
361 static void wake_up_client(struct client *client)
362 {
363         wake_up_interruptible(&client->wait);
364 }
365
366 void fw_device_cdev_remove(struct fw_device *device)
367 {
368         for_each_client(device, wake_up_client);
369 }
370
371 static int ioctl_get_info(struct client *client, void *buffer)
372 {
373         struct fw_cdev_get_info *get_info = buffer;
374         struct fw_cdev_event_bus_reset bus_reset;
375         unsigned long ret = 0;
376
377         client->version = get_info->version;
378         get_info->version = FW_CDEV_VERSION;
379         get_info->card = client->device->card->index;
380
381         down_read(&fw_device_rwsem);
382
383         if (get_info->rom != 0) {
384                 void __user *uptr = u64_to_uptr(get_info->rom);
385                 size_t want = get_info->rom_length;
386                 size_t have = client->device->config_rom_length * 4;
387
388                 ret = copy_to_user(uptr, client->device->config_rom,
389                                    min(want, have));
390         }
391         get_info->rom_length = client->device->config_rom_length * 4;
392
393         up_read(&fw_device_rwsem);
394
395         if (ret != 0)
396                 return -EFAULT;
397
398         client->bus_reset_closure = get_info->bus_reset_closure;
399         if (get_info->bus_reset != 0) {
400                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
401
402                 fill_bus_reset_event(&bus_reset, client);
403                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
404                         return -EFAULT;
405         }
406
407         return 0;
408 }
409
410 static int add_client_resource(struct client *client,
411                                struct client_resource *resource, gfp_t gfp_mask)
412 {
413         unsigned long flags;
414         int ret;
415
416  retry:
417         if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
418                 return -ENOMEM;
419
420         spin_lock_irqsave(&client->lock, flags);
421         if (client->in_shutdown)
422                 ret = -ECANCELED;
423         else
424                 ret = idr_get_new(&client->resource_idr, resource,
425                                   &resource->handle);
426         if (ret >= 0) {
427                 client_get(client);
428                 schedule_if_iso_resource(resource);
429         }
430         spin_unlock_irqrestore(&client->lock, flags);
431
432         if (ret == -EAGAIN)
433                 goto retry;
434
435         return ret < 0 ? ret : 0;
436 }
437
438 static int release_client_resource(struct client *client, u32 handle,
439                                    client_resource_release_fn_t release,
440                                    struct client_resource **return_resource)
441 {
442         struct client_resource *resource;
443
444         spin_lock_irq(&client->lock);
445         if (client->in_shutdown)
446                 resource = NULL;
447         else
448                 resource = idr_find(&client->resource_idr, handle);
449         if (resource && resource->release == release)
450                 idr_remove(&client->resource_idr, handle);
451         spin_unlock_irq(&client->lock);
452
453         if (!(resource && resource->release == release))
454                 return -EINVAL;
455
456         if (return_resource)
457                 *return_resource = resource;
458         else
459                 resource->release(client, resource);
460
461         client_put(client);
462
463         return 0;
464 }
465
466 static void release_transaction(struct client *client,
467                                 struct client_resource *resource)
468 {
469         struct outbound_transaction_resource *r = container_of(resource,
470                         struct outbound_transaction_resource, resource);
471
472         fw_cancel_transaction(client->device->card, &r->transaction);
473 }
474
475 static void complete_transaction(struct fw_card *card, int rcode,
476                                  void *payload, size_t length, void *data)
477 {
478         struct outbound_transaction_event *e = data;
479         struct fw_cdev_event_response *rsp = &e->response;
480         struct client *client = e->client;
481         unsigned long flags;
482
483         if (length < rsp->length)
484                 rsp->length = length;
485         if (rcode == RCODE_COMPLETE)
486                 memcpy(rsp->data, payload, rsp->length);
487
488         spin_lock_irqsave(&client->lock, flags);
489         /*
490          * 1. If called while in shutdown, the idr tree must be left untouched.
491          *    The idr handle will be removed and the client reference will be
492          *    dropped later.
493          * 2. If the call chain was release_client_resource ->
494          *    release_transaction -> complete_transaction (instead of a normal
495          *    conclusion of the transaction), i.e. if this resource was already
496          *    unregistered from the idr, the client reference will be dropped
497          *    by release_client_resource and we must not drop it here.
498          */
499         if (!client->in_shutdown &&
500             idr_find(&client->resource_idr, e->r.resource.handle)) {
501                 idr_remove(&client->resource_idr, e->r.resource.handle);
502                 /* Drop the idr's reference */
503                 client_put(client);
504         }
505         spin_unlock_irqrestore(&client->lock, flags);
506
507         rsp->type = FW_CDEV_EVENT_RESPONSE;
508         rsp->rcode = rcode;
509
510         /*
511          * In the case that sizeof(*rsp) doesn't align with the position of the
512          * data, and the read is short, preserve an extra copy of the data
513          * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
514          * for short reads and some apps depended on it, this is both safe
515          * and prudent for compatibility.
516          */
517         if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
518                 queue_event(client, &e->event, rsp, sizeof(*rsp),
519                             rsp->data, rsp->length);
520         else
521                 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
522                             NULL, 0);
523
524         /* Drop the transaction callback's reference */
525         client_put(client);
526 }
527
528 static int init_request(struct client *client,
529                         struct fw_cdev_send_request *request,
530                         int destination_id, int speed)
531 {
532         struct outbound_transaction_event *e;
533         int ret;
534
535         if (request->tcode != TCODE_STREAM_DATA &&
536             (request->length > 4096 || request->length > 512 << speed))
537                 return -EIO;
538
539         e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
540         if (e == NULL)
541                 return -ENOMEM;
542
543         e->client = client;
544         e->response.length = request->length;
545         e->response.closure = request->closure;
546
547         if (request->data &&
548             copy_from_user(e->response.data,
549                            u64_to_uptr(request->data), request->length)) {
550                 ret = -EFAULT;
551                 goto failed;
552         }
553
554         e->r.resource.release = release_transaction;
555         ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
556         if (ret < 0)
557                 goto failed;
558
559         /* Get a reference for the transaction callback */
560         client_get(client);
561
562         fw_send_request(client->device->card, &e->r.transaction,
563                         request->tcode, destination_id, request->generation,
564                         speed, request->offset, e->response.data,
565                         request->length, complete_transaction, e);
566         return 0;
567
568  failed:
569         kfree(e);
570
571         return ret;
572 }
573
574 static int ioctl_send_request(struct client *client, void *buffer)
575 {
576         struct fw_cdev_send_request *request = buffer;
577
578         switch (request->tcode) {
579         case TCODE_WRITE_QUADLET_REQUEST:
580         case TCODE_WRITE_BLOCK_REQUEST:
581         case TCODE_READ_QUADLET_REQUEST:
582         case TCODE_READ_BLOCK_REQUEST:
583         case TCODE_LOCK_MASK_SWAP:
584         case TCODE_LOCK_COMPARE_SWAP:
585         case TCODE_LOCK_FETCH_ADD:
586         case TCODE_LOCK_LITTLE_ADD:
587         case TCODE_LOCK_BOUNDED_ADD:
588         case TCODE_LOCK_WRAP_ADD:
589         case TCODE_LOCK_VENDOR_DEPENDENT:
590                 break;
591         default:
592                 return -EINVAL;
593         }
594
595         return init_request(client, request, client->device->node_id,
596                             client->device->max_speed);
597 }
598
599 static inline bool is_fcp_request(struct fw_request *request)
600 {
601         return request == NULL;
602 }
603
604 static void release_request(struct client *client,
605                             struct client_resource *resource)
606 {
607         struct inbound_transaction_resource *r = container_of(resource,
608                         struct inbound_transaction_resource, resource);
609
610         if (is_fcp_request(r->request))
611                 kfree(r->data);
612         else
613                 fw_send_response(client->device->card, r->request,
614                                  RCODE_CONFLICT_ERROR);
615         kfree(r);
616 }
617
618 static void handle_request(struct fw_card *card, struct fw_request *request,
619                            int tcode, int destination, int source,
620                            int generation, int speed,
621                            unsigned long long offset,
622                            void *payload, size_t length, void *callback_data)
623 {
624         struct address_handler_resource *handler = callback_data;
625         struct inbound_transaction_resource *r;
626         struct inbound_transaction_event *e;
627         void *fcp_frame = NULL;
628         int ret;
629
630         r = kmalloc(sizeof(*r), GFP_ATOMIC);
631         e = kmalloc(sizeof(*e), GFP_ATOMIC);
632         if (r == NULL || e == NULL)
633                 goto failed;
634
635         r->request = request;
636         r->data    = payload;
637         r->length  = length;
638
639         if (is_fcp_request(request)) {
640                 /*
641                  * FIXME: Let core-transaction.c manage a
642                  * single reference-counted copy?
643                  */
644                 fcp_frame = kmemdup(payload, length, GFP_ATOMIC);
645                 if (fcp_frame == NULL)
646                         goto failed;
647
648                 r->data = fcp_frame;
649         }
650
651         r->resource.release = release_request;
652         ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
653         if (ret < 0)
654                 goto failed;
655
656         e->request.type    = FW_CDEV_EVENT_REQUEST;
657         e->request.tcode   = tcode;
658         e->request.offset  = offset;
659         e->request.length  = length;
660         e->request.handle  = r->resource.handle;
661         e->request.closure = handler->closure;
662
663         queue_event(handler->client, &e->event,
664                     &e->request, sizeof(e->request), r->data, length);
665         return;
666
667  failed:
668         kfree(r);
669         kfree(e);
670         kfree(fcp_frame);
671
672         if (!is_fcp_request(request))
673                 fw_send_response(card, request, RCODE_CONFLICT_ERROR);
674 }
675
676 static void release_address_handler(struct client *client,
677                                     struct client_resource *resource)
678 {
679         struct address_handler_resource *r =
680             container_of(resource, struct address_handler_resource, resource);
681
682         fw_core_remove_address_handler(&r->handler);
683         kfree(r);
684 }
685
686 static int ioctl_allocate(struct client *client, void *buffer)
687 {
688         struct fw_cdev_allocate *request = buffer;
689         struct address_handler_resource *r;
690         struct fw_address_region region;
691         int ret;
692
693         r = kmalloc(sizeof(*r), GFP_KERNEL);
694         if (r == NULL)
695                 return -ENOMEM;
696
697         region.start = request->offset;
698         region.end = request->offset + request->length;
699         r->handler.length = request->length;
700         r->handler.address_callback = handle_request;
701         r->handler.callback_data = r;
702         r->closure = request->closure;
703         r->client = client;
704
705         ret = fw_core_add_address_handler(&r->handler, &region);
706         if (ret < 0) {
707                 kfree(r);
708                 return ret;
709         }
710
711         r->resource.release = release_address_handler;
712         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
713         if (ret < 0) {
714                 release_address_handler(client, &r->resource);
715                 return ret;
716         }
717         request->handle = r->resource.handle;
718
719         return 0;
720 }
721
722 static int ioctl_deallocate(struct client *client, void *buffer)
723 {
724         struct fw_cdev_deallocate *request = buffer;
725
726         return release_client_resource(client, request->handle,
727                                        release_address_handler, NULL);
728 }
729
730 static int ioctl_send_response(struct client *client, void *buffer)
731 {
732         struct fw_cdev_send_response *request = buffer;
733         struct client_resource *resource;
734         struct inbound_transaction_resource *r;
735         int ret = 0;
736
737         if (release_client_resource(client, request->handle,
738                                     release_request, &resource) < 0)
739                 return -EINVAL;
740
741         r = container_of(resource, struct inbound_transaction_resource,
742                          resource);
743         if (is_fcp_request(r->request))
744                 goto out;
745
746         if (request->length < r->length)
747                 r->length = request->length;
748         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length)) {
749                 ret = -EFAULT;
750                 kfree(r->request);
751                 goto out;
752         }
753         fw_send_response(client->device->card, r->request, request->rcode);
754  out:
755         kfree(r);
756
757         return ret;
758 }
759
760 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
761 {
762         struct fw_cdev_initiate_bus_reset *request = buffer;
763         int short_reset;
764
765         short_reset = (request->type == FW_CDEV_SHORT_RESET);
766
767         return fw_core_initiate_bus_reset(client->device->card, short_reset);
768 }
769
770 static void release_descriptor(struct client *client,
771                                struct client_resource *resource)
772 {
773         struct descriptor_resource *r =
774                 container_of(resource, struct descriptor_resource, resource);
775
776         fw_core_remove_descriptor(&r->descriptor);
777         kfree(r);
778 }
779
780 static int ioctl_add_descriptor(struct client *client, void *buffer)
781 {
782         struct fw_cdev_add_descriptor *request = buffer;
783         struct descriptor_resource *r;
784         int ret;
785
786         /* Access policy: Allow this ioctl only on local nodes' device files. */
787         if (!client->device->is_local)
788                 return -ENOSYS;
789
790         if (request->length > 256)
791                 return -EINVAL;
792
793         r = kmalloc(sizeof(*r) + request->length * 4, GFP_KERNEL);
794         if (r == NULL)
795                 return -ENOMEM;
796
797         if (copy_from_user(r->data,
798                            u64_to_uptr(request->data), request->length * 4)) {
799                 ret = -EFAULT;
800                 goto failed;
801         }
802
803         r->descriptor.length    = request->length;
804         r->descriptor.immediate = request->immediate;
805         r->descriptor.key       = request->key;
806         r->descriptor.data      = r->data;
807
808         ret = fw_core_add_descriptor(&r->descriptor);
809         if (ret < 0)
810                 goto failed;
811
812         r->resource.release = release_descriptor;
813         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
814         if (ret < 0) {
815                 fw_core_remove_descriptor(&r->descriptor);
816                 goto failed;
817         }
818         request->handle = r->resource.handle;
819
820         return 0;
821  failed:
822         kfree(r);
823
824         return ret;
825 }
826
827 static int ioctl_remove_descriptor(struct client *client, void *buffer)
828 {
829         struct fw_cdev_remove_descriptor *request = buffer;
830
831         return release_client_resource(client, request->handle,
832                                        release_descriptor, NULL);
833 }
834
835 static void iso_callback(struct fw_iso_context *context, u32 cycle,
836                          size_t header_length, void *header, void *data)
837 {
838         struct client *client = data;
839         struct iso_interrupt_event *e;
840
841         e = kzalloc(sizeof(*e) + header_length, GFP_ATOMIC);
842         if (e == NULL)
843                 return;
844
845         e->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
846         e->interrupt.closure   = client->iso_closure;
847         e->interrupt.cycle     = cycle;
848         e->interrupt.header_length = header_length;
849         memcpy(e->interrupt.header, header, header_length);
850         queue_event(client, &e->event, &e->interrupt,
851                     sizeof(e->interrupt) + header_length, NULL, 0);
852 }
853
854 static int ioctl_create_iso_context(struct client *client, void *buffer)
855 {
856         struct fw_cdev_create_iso_context *request = buffer;
857         struct fw_iso_context *context;
858
859         /* We only support one context at this time. */
860         if (client->iso_context != NULL)
861                 return -EBUSY;
862
863         if (request->channel > 63)
864                 return -EINVAL;
865
866         switch (request->type) {
867         case FW_ISO_CONTEXT_RECEIVE:
868                 if (request->header_size < 4 || (request->header_size & 3))
869                         return -EINVAL;
870
871                 break;
872
873         case FW_ISO_CONTEXT_TRANSMIT:
874                 if (request->speed > SCODE_3200)
875                         return -EINVAL;
876
877                 break;
878
879         default:
880                 return -EINVAL;
881         }
882
883         context =  fw_iso_context_create(client->device->card,
884                                          request->type,
885                                          request->channel,
886                                          request->speed,
887                                          request->header_size,
888                                          iso_callback, client);
889         if (IS_ERR(context))
890                 return PTR_ERR(context);
891
892         client->iso_closure = request->closure;
893         client->iso_context = context;
894
895         /* We only support one context at this time. */
896         request->handle = 0;
897
898         return 0;
899 }
900
901 /* Macros for decoding the iso packet control header. */
902 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
903 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
904 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
905 #define GET_TAG(v)              (((v) >> 18) & 0x03)
906 #define GET_SY(v)               (((v) >> 20) & 0x0f)
907 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
908
909 static int ioctl_queue_iso(struct client *client, void *buffer)
910 {
911         struct fw_cdev_queue_iso *request = buffer;
912         struct fw_cdev_iso_packet __user *p, *end, *next;
913         struct fw_iso_context *ctx = client->iso_context;
914         unsigned long payload, buffer_end, header_length;
915         u32 control;
916         int count;
917         struct {
918                 struct fw_iso_packet packet;
919                 u8 header[256];
920         } u;
921
922         if (ctx == NULL || request->handle != 0)
923                 return -EINVAL;
924
925         /*
926          * If the user passes a non-NULL data pointer, has mmap()'ed
927          * the iso buffer, and the pointer points inside the buffer,
928          * we setup the payload pointers accordingly.  Otherwise we
929          * set them both to 0, which will still let packets with
930          * payload_length == 0 through.  In other words, if no packets
931          * use the indirect payload, the iso buffer need not be mapped
932          * and the request->data pointer is ignored.
933          */
934
935         payload = (unsigned long)request->data - client->vm_start;
936         buffer_end = client->buffer.page_count << PAGE_SHIFT;
937         if (request->data == 0 || client->buffer.pages == NULL ||
938             payload >= buffer_end) {
939                 payload = 0;
940                 buffer_end = 0;
941         }
942
943         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
944
945         if (!access_ok(VERIFY_READ, p, request->size))
946                 return -EFAULT;
947
948         end = (void __user *)p + request->size;
949         count = 0;
950         while (p < end) {
951                 if (get_user(control, &p->control))
952                         return -EFAULT;
953                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
954                 u.packet.interrupt = GET_INTERRUPT(control);
955                 u.packet.skip = GET_SKIP(control);
956                 u.packet.tag = GET_TAG(control);
957                 u.packet.sy = GET_SY(control);
958                 u.packet.header_length = GET_HEADER_LENGTH(control);
959
960                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
961                         header_length = u.packet.header_length;
962                 } else {
963                         /*
964                          * We require that header_length is a multiple of
965                          * the fixed header size, ctx->header_size.
966                          */
967                         if (ctx->header_size == 0) {
968                                 if (u.packet.header_length > 0)
969                                         return -EINVAL;
970                         } else if (u.packet.header_length % ctx->header_size != 0) {
971                                 return -EINVAL;
972                         }
973                         header_length = 0;
974                 }
975
976                 next = (struct fw_cdev_iso_packet __user *)
977                         &p->header[header_length / 4];
978                 if (next > end)
979                         return -EINVAL;
980                 if (__copy_from_user
981                     (u.packet.header, p->header, header_length))
982                         return -EFAULT;
983                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
984                     u.packet.header_length + u.packet.payload_length > 0)
985                         return -EINVAL;
986                 if (payload + u.packet.payload_length > buffer_end)
987                         return -EINVAL;
988
989                 if (fw_iso_context_queue(ctx, &u.packet,
990                                          &client->buffer, payload))
991                         break;
992
993                 p = next;
994                 payload += u.packet.payload_length;
995                 count++;
996         }
997
998         request->size    -= uptr_to_u64(p) - request->packets;
999         request->packets  = uptr_to_u64(p);
1000         request->data     = client->vm_start + payload;
1001
1002         return count;
1003 }
1004
1005 static int ioctl_start_iso(struct client *client, void *buffer)
1006 {
1007         struct fw_cdev_start_iso *request = buffer;
1008
1009         if (client->iso_context == NULL || request->handle != 0)
1010                 return -EINVAL;
1011
1012         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
1013                 if (request->tags == 0 || request->tags > 15)
1014                         return -EINVAL;
1015
1016                 if (request->sync > 15)
1017                         return -EINVAL;
1018         }
1019
1020         return fw_iso_context_start(client->iso_context, request->cycle,
1021                                     request->sync, request->tags);
1022 }
1023
1024 static int ioctl_stop_iso(struct client *client, void *buffer)
1025 {
1026         struct fw_cdev_stop_iso *request = buffer;
1027
1028         if (client->iso_context == NULL || request->handle != 0)
1029                 return -EINVAL;
1030
1031         return fw_iso_context_stop(client->iso_context);
1032 }
1033
1034 static int ioctl_get_cycle_timer2(struct client *client, void *buffer)
1035 {
1036         struct fw_cdev_get_cycle_timer2 *request = buffer;
1037         struct fw_card *card = client->device->card;
1038         struct timespec ts = {0, 0};
1039         u32 cycle_time;
1040         int ret = 0;
1041
1042         local_irq_disable();
1043
1044         cycle_time = card->driver->get_cycle_time(card);
1045
1046         switch (request->clk_id) {
1047         case CLOCK_REALTIME:      getnstimeofday(&ts);                   break;
1048         case CLOCK_MONOTONIC:     do_posix_clock_monotonic_gettime(&ts); break;
1049         case CLOCK_MONOTONIC_RAW: getrawmonotonic(&ts);                  break;
1050         default:
1051                 ret = -EINVAL;
1052         }
1053
1054         local_irq_enable();
1055
1056         request->tv_sec         = ts.tv_sec;
1057         request->tv_nsec        = ts.tv_nsec;
1058         request->cycle_timer    = cycle_time;
1059
1060         return ret;
1061 }
1062
1063 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
1064 {
1065         struct fw_cdev_get_cycle_timer *request = buffer;
1066         struct fw_cdev_get_cycle_timer2 ct2;
1067
1068         ct2.clk_id = CLOCK_REALTIME;
1069         ioctl_get_cycle_timer2(client, &ct2);
1070
1071         request->local_time     = ct2.tv_sec * USEC_PER_SEC +
1072                                   ct2.tv_nsec / NSEC_PER_USEC;
1073         request->cycle_timer    = ct2.cycle_timer;
1074
1075         return 0;
1076 }
1077
1078 static void iso_resource_work(struct work_struct *work)
1079 {
1080         struct iso_resource_event *e;
1081         struct iso_resource *r =
1082                         container_of(work, struct iso_resource, work.work);
1083         struct client *client = r->client;
1084         int generation, channel, bandwidth, todo;
1085         bool skip, free, success;
1086
1087         spin_lock_irq(&client->lock);
1088         generation = client->device->generation;
1089         todo = r->todo;
1090         /* Allow 1000ms grace period for other reallocations. */
1091         if (todo == ISO_RES_ALLOC &&
1092             time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
1093                 schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3));
1094                 skip = true;
1095         } else {
1096                 /* We could be called twice within the same generation. */
1097                 skip = todo == ISO_RES_REALLOC &&
1098                        r->generation == generation;
1099         }
1100         free = todo == ISO_RES_DEALLOC ||
1101                todo == ISO_RES_ALLOC_ONCE ||
1102                todo == ISO_RES_DEALLOC_ONCE;
1103         r->generation = generation;
1104         spin_unlock_irq(&client->lock);
1105
1106         if (skip)
1107                 goto out;
1108
1109         bandwidth = r->bandwidth;
1110
1111         fw_iso_resource_manage(client->device->card, generation,
1112                         r->channels, &channel, &bandwidth,
1113                         todo == ISO_RES_ALLOC ||
1114                         todo == ISO_RES_REALLOC ||
1115                         todo == ISO_RES_ALLOC_ONCE,
1116                         r->transaction_data);
1117         /*
1118          * Is this generation outdated already?  As long as this resource sticks
1119          * in the idr, it will be scheduled again for a newer generation or at
1120          * shutdown.
1121          */
1122         if (channel == -EAGAIN &&
1123             (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
1124                 goto out;
1125
1126         success = channel >= 0 || bandwidth > 0;
1127
1128         spin_lock_irq(&client->lock);
1129         /*
1130          * Transit from allocation to reallocation, except if the client
1131          * requested deallocation in the meantime.
1132          */
1133         if (r->todo == ISO_RES_ALLOC)
1134                 r->todo = ISO_RES_REALLOC;
1135         /*
1136          * Allocation or reallocation failure?  Pull this resource out of the
1137          * idr and prepare for deletion, unless the client is shutting down.
1138          */
1139         if (r->todo == ISO_RES_REALLOC && !success &&
1140             !client->in_shutdown &&
1141             idr_find(&client->resource_idr, r->resource.handle)) {
1142                 idr_remove(&client->resource_idr, r->resource.handle);
1143                 client_put(client);
1144                 free = true;
1145         }
1146         spin_unlock_irq(&client->lock);
1147
1148         if (todo == ISO_RES_ALLOC && channel >= 0)
1149                 r->channels = 1ULL << channel;
1150
1151         if (todo == ISO_RES_REALLOC && success)
1152                 goto out;
1153
1154         if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
1155                 e = r->e_alloc;
1156                 r->e_alloc = NULL;
1157         } else {
1158                 e = r->e_dealloc;
1159                 r->e_dealloc = NULL;
1160         }
1161         e->iso_resource.handle    = r->resource.handle;
1162         e->iso_resource.channel   = channel;
1163         e->iso_resource.bandwidth = bandwidth;
1164
1165         queue_event(client, &e->event,
1166                     &e->iso_resource, sizeof(e->iso_resource), NULL, 0);
1167
1168         if (free) {
1169                 cancel_delayed_work(&r->work);
1170                 kfree(r->e_alloc);
1171                 kfree(r->e_dealloc);
1172                 kfree(r);
1173         }
1174  out:
1175         client_put(client);
1176 }
1177
1178 static void release_iso_resource(struct client *client,
1179                                  struct client_resource *resource)
1180 {
1181         struct iso_resource *r =
1182                 container_of(resource, struct iso_resource, resource);
1183
1184         spin_lock_irq(&client->lock);
1185         r->todo = ISO_RES_DEALLOC;
1186         schedule_iso_resource(r, 0);
1187         spin_unlock_irq(&client->lock);
1188 }
1189
1190 static int init_iso_resource(struct client *client,
1191                 struct fw_cdev_allocate_iso_resource *request, int todo)
1192 {
1193         struct iso_resource_event *e1, *e2;
1194         struct iso_resource *r;
1195         int ret;
1196
1197         if ((request->channels == 0 && request->bandwidth == 0) ||
1198             request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL ||
1199             request->bandwidth < 0)
1200                 return -EINVAL;
1201
1202         r  = kmalloc(sizeof(*r), GFP_KERNEL);
1203         e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
1204         e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
1205         if (r == NULL || e1 == NULL || e2 == NULL) {
1206                 ret = -ENOMEM;
1207                 goto fail;
1208         }
1209
1210         INIT_DELAYED_WORK(&r->work, iso_resource_work);
1211         r->client       = client;
1212         r->todo         = todo;
1213         r->generation   = -1;
1214         r->channels     = request->channels;
1215         r->bandwidth    = request->bandwidth;
1216         r->e_alloc      = e1;
1217         r->e_dealloc    = e2;
1218
1219         e1->iso_resource.closure = request->closure;
1220         e1->iso_resource.type    = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
1221         e2->iso_resource.closure = request->closure;
1222         e2->iso_resource.type    = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
1223
1224         if (todo == ISO_RES_ALLOC) {
1225                 r->resource.release = release_iso_resource;
1226                 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
1227                 if (ret < 0)
1228                         goto fail;
1229         } else {
1230                 r->resource.release = NULL;
1231                 r->resource.handle = -1;
1232                 schedule_iso_resource(r, 0);
1233         }
1234         request->handle = r->resource.handle;
1235
1236         return 0;
1237  fail:
1238         kfree(r);
1239         kfree(e1);
1240         kfree(e2);
1241
1242         return ret;
1243 }
1244
1245 static int ioctl_allocate_iso_resource(struct client *client, void *buffer)
1246 {
1247         struct fw_cdev_allocate_iso_resource *request = buffer;
1248
1249         return init_iso_resource(client, request, ISO_RES_ALLOC);
1250 }
1251
1252 static int ioctl_deallocate_iso_resource(struct client *client, void *buffer)
1253 {
1254         struct fw_cdev_deallocate *request = buffer;
1255
1256         return release_client_resource(client, request->handle,
1257                                        release_iso_resource, NULL);
1258 }
1259
1260 static int ioctl_allocate_iso_resource_once(struct client *client, void *buffer)
1261 {
1262         struct fw_cdev_allocate_iso_resource *request = buffer;
1263
1264         return init_iso_resource(client, request, ISO_RES_ALLOC_ONCE);
1265 }
1266
1267 static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffer)
1268 {
1269         struct fw_cdev_allocate_iso_resource *request = buffer;
1270
1271         return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE);
1272 }
1273
1274 /*
1275  * Returns a speed code:  Maximum speed to or from this device,
1276  * limited by the device's link speed, the local node's link speed,
1277  * and all PHY port speeds between the two links.
1278  */
1279 static int ioctl_get_speed(struct client *client, void *buffer)
1280 {
1281         return client->device->max_speed;
1282 }
1283
1284 static int ioctl_send_broadcast_request(struct client *client, void *buffer)
1285 {
1286         struct fw_cdev_send_request *request = buffer;
1287
1288         switch (request->tcode) {
1289         case TCODE_WRITE_QUADLET_REQUEST:
1290         case TCODE_WRITE_BLOCK_REQUEST:
1291                 break;
1292         default:
1293                 return -EINVAL;
1294         }
1295
1296         /* Security policy: Only allow accesses to Units Space. */
1297         if (request->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
1298                 return -EACCES;
1299
1300         return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100);
1301 }
1302
1303 static int ioctl_send_stream_packet(struct client *client, void *buffer)
1304 {
1305         struct fw_cdev_send_stream_packet *p = buffer;
1306         struct fw_cdev_send_request request;
1307         int dest;
1308
1309         if (p->speed > client->device->card->link_speed ||
1310             p->length > 1024 << p->speed)
1311                 return -EIO;
1312
1313         if (p->tag > 3 || p->channel > 63 || p->sy > 15)
1314                 return -EINVAL;
1315
1316         dest = fw_stream_packet_destination_id(p->tag, p->channel, p->sy);
1317         request.tcode           = TCODE_STREAM_DATA;
1318         request.length          = p->length;
1319         request.closure         = p->closure;
1320         request.data            = p->data;
1321         request.generation      = p->generation;
1322
1323         return init_request(client, &request, dest, p->speed);
1324 }
1325
1326 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
1327         ioctl_get_info,
1328         ioctl_send_request,
1329         ioctl_allocate,
1330         ioctl_deallocate,
1331         ioctl_send_response,
1332         ioctl_initiate_bus_reset,
1333         ioctl_add_descriptor,
1334         ioctl_remove_descriptor,
1335         ioctl_create_iso_context,
1336         ioctl_queue_iso,
1337         ioctl_start_iso,
1338         ioctl_stop_iso,
1339         ioctl_get_cycle_timer,
1340         ioctl_allocate_iso_resource,
1341         ioctl_deallocate_iso_resource,
1342         ioctl_allocate_iso_resource_once,
1343         ioctl_deallocate_iso_resource_once,
1344         ioctl_get_speed,
1345         ioctl_send_broadcast_request,
1346         ioctl_send_stream_packet,
1347         ioctl_get_cycle_timer2,
1348 };
1349
1350 static int dispatch_ioctl(struct client *client,
1351                           unsigned int cmd, void __user *arg)
1352 {
1353         char buffer[sizeof(union {
1354                 struct fw_cdev_get_info                 _00;
1355                 struct fw_cdev_send_request             _01;
1356                 struct fw_cdev_allocate                 _02;
1357                 struct fw_cdev_deallocate               _03;
1358                 struct fw_cdev_send_response            _04;
1359                 struct fw_cdev_initiate_bus_reset       _05;
1360                 struct fw_cdev_add_descriptor           _06;
1361                 struct fw_cdev_remove_descriptor        _07;
1362                 struct fw_cdev_create_iso_context       _08;
1363                 struct fw_cdev_queue_iso                _09;
1364                 struct fw_cdev_start_iso                _0a;
1365                 struct fw_cdev_stop_iso                 _0b;
1366                 struct fw_cdev_get_cycle_timer          _0c;
1367                 struct fw_cdev_allocate_iso_resource    _0d;
1368                 struct fw_cdev_send_stream_packet       _13;
1369                 struct fw_cdev_get_cycle_timer2         _14;
1370         })];
1371         int ret;
1372
1373         if (_IOC_TYPE(cmd) != '#' ||
1374             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
1375                 return -EINVAL;
1376
1377         if (_IOC_DIR(cmd) & _IOC_WRITE) {
1378                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1379                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
1380                         return -EFAULT;
1381         }
1382
1383         ret = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
1384         if (ret < 0)
1385                 return ret;
1386
1387         if (_IOC_DIR(cmd) & _IOC_READ) {
1388                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1389                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
1390                         return -EFAULT;
1391         }
1392
1393         return ret;
1394 }
1395
1396 static long fw_device_op_ioctl(struct file *file,
1397                                unsigned int cmd, unsigned long arg)
1398 {
1399         struct client *client = file->private_data;
1400
1401         if (fw_device_is_shutdown(client->device))
1402                 return -ENODEV;
1403
1404         return dispatch_ioctl(client, cmd, (void __user *) arg);
1405 }
1406
1407 #ifdef CONFIG_COMPAT
1408 static long fw_device_op_compat_ioctl(struct file *file,
1409                                       unsigned int cmd, unsigned long arg)
1410 {
1411         struct client *client = file->private_data;
1412
1413         if (fw_device_is_shutdown(client->device))
1414                 return -ENODEV;
1415
1416         return dispatch_ioctl(client, cmd, compat_ptr(arg));
1417 }
1418 #endif
1419
1420 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
1421 {
1422         struct client *client = file->private_data;
1423         enum dma_data_direction direction;
1424         unsigned long size;
1425         int page_count, ret;
1426
1427         if (fw_device_is_shutdown(client->device))
1428                 return -ENODEV;
1429
1430         /* FIXME: We could support multiple buffers, but we don't. */
1431         if (client->buffer.pages != NULL)
1432                 return -EBUSY;
1433
1434         if (!(vma->vm_flags & VM_SHARED))
1435                 return -EINVAL;
1436
1437         if (vma->vm_start & ~PAGE_MASK)
1438                 return -EINVAL;
1439
1440         client->vm_start = vma->vm_start;
1441         size = vma->vm_end - vma->vm_start;
1442         page_count = size >> PAGE_SHIFT;
1443         if (size & ~PAGE_MASK)
1444                 return -EINVAL;
1445
1446         if (vma->vm_flags & VM_WRITE)
1447                 direction = DMA_TO_DEVICE;
1448         else
1449                 direction = DMA_FROM_DEVICE;
1450
1451         ret = fw_iso_buffer_init(&client->buffer, client->device->card,
1452                                  page_count, direction);
1453         if (ret < 0)
1454                 return ret;
1455
1456         ret = fw_iso_buffer_map(&client->buffer, vma);
1457         if (ret < 0)
1458                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1459
1460         return ret;
1461 }
1462
1463 static int shutdown_resource(int id, void *p, void *data)
1464 {
1465         struct client_resource *resource = p;
1466         struct client *client = data;
1467
1468         resource->release(client, resource);
1469         client_put(client);
1470
1471         return 0;
1472 }
1473
1474 static int fw_device_op_release(struct inode *inode, struct file *file)
1475 {
1476         struct client *client = file->private_data;
1477         struct event *event, *next_event;
1478
1479         mutex_lock(&client->device->client_list_mutex);
1480         list_del(&client->link);
1481         mutex_unlock(&client->device->client_list_mutex);
1482
1483         if (client->iso_context)
1484                 fw_iso_context_destroy(client->iso_context);
1485
1486         if (client->buffer.pages)
1487                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1488
1489         /* Freeze client->resource_idr and client->event_list */
1490         spin_lock_irq(&client->lock);
1491         client->in_shutdown = true;
1492         spin_unlock_irq(&client->lock);
1493
1494         idr_for_each(&client->resource_idr, shutdown_resource, client);
1495         idr_remove_all(&client->resource_idr);
1496         idr_destroy(&client->resource_idr);
1497
1498         list_for_each_entry_safe(event, next_event, &client->event_list, link)
1499                 kfree(event);
1500
1501         client_put(client);
1502
1503         return 0;
1504 }
1505
1506 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
1507 {
1508         struct client *client = file->private_data;
1509         unsigned int mask = 0;
1510
1511         poll_wait(file, &client->wait, pt);
1512
1513         if (fw_device_is_shutdown(client->device))
1514                 mask |= POLLHUP | POLLERR;
1515         if (!list_empty(&client->event_list))
1516                 mask |= POLLIN | POLLRDNORM;
1517
1518         return mask;
1519 }
1520
1521 const struct file_operations fw_device_ops = {
1522         .owner          = THIS_MODULE,
1523         .open           = fw_device_op_open,
1524         .read           = fw_device_op_read,
1525         .unlocked_ioctl = fw_device_op_ioctl,
1526         .poll           = fw_device_op_poll,
1527         .release        = fw_device_op_release,
1528         .mmap           = fw_device_op_mmap,
1529
1530 #ifdef CONFIG_COMPAT
1531         .compat_ioctl   = fw_device_op_compat_ioctl,
1532 #endif
1533 };