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/jiffies.h>
  29 #include <linux/kernel.h>
  30 #include <linux/kref.h>
  31 #include <linux/mm.h>
  32 #include <linux/module.h>
  33 #include <linux/mutex.h>
  34 #include <linux/poll.h>
  35 #include <linux/preempt.h>
  36 #include <linux/sched.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/time.h>
  39 #include <linux/uaccess.h>
  40 #include <linux/vmalloc.h>
  41 #include <linux/wait.h>
  42 #include <linux/workqueue.h>
  43
  44 #include <asm/system.h>
  45
  46 #include "core.h"
  47
  48 struct client {
  49         u32 version;
  50         struct fw_device *device;
  51
  52         spinlock_t lock;
  53         bool in_shutdown;
  54         struct idr resource_idr;
  55         struct list_head event_list;
  56         wait_queue_head_t wait;
  57         u64 bus_reset_closure;
  58
  59         struct fw_iso_context *iso_context;
  60         u64 iso_closure;
  61         struct fw_iso_buffer buffer;
  62         unsigned long vm_start;
  63
  64         struct list_head link;
  65         struct kref kref;
  66 };
  67
  68 static inline void client_get(struct client *client)
  69 {
  70         kref_get(&client->kref);
  71 }
  72
  73 static void client_release(struct kref *kref)
  74 {
  75         struct client *client = container_of(kref, struct client, kref);
  76
  77         fw_device_put(client->device);
  78         kfree(client);
  79 }
  80
  81 static void client_put(struct client *client)
  82 {
  83         kref_put(&client->kref, client_release);
  84 }
  85
  86 struct client_resource;
  87 typedef void (*client_resource_release_fn_t)(struct client *,
  88                                              struct client_resource *);
  89 struct client_resource {
  90         client_resource_release_fn_t release;
  91         int handle;
  92 };
  93
  94 struct address_handler_resource {
  95         struct client_resource resource;
  96         struct fw_address_handler handler;
  97         __u64 closure;
  98         struct client *client;
  99 };
 100
 101 struct outbound_transaction_resource {
 102         struct client_resource resource;
 103         struct fw_transaction transaction;
 104 };
 105
 106 struct inbound_transaction_resource {
 107         struct client_resource resource;
 108         struct fw_request *request;
 109         void *data;
 110         size_t length;
 111 };
 112
 113 struct descriptor_resource {
 114         struct client_resource resource;
 115         struct fw_descriptor descriptor;
 116         u32 data[0];
 117 };
 118
 119 struct iso_resource {
 120         struct client_resource resource;
 121         struct client *client;
 122         /* Schedule work and access todo only with client->lock held. */
 123         struct delayed_work work;
 124         enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC,
 125               ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo;
 126         int generation;
 127         u64 channels;
 128         s32 bandwidth;
 129         __be32 transaction_data[2];
 130         struct iso_resource_event *e_alloc, *e_dealloc;
 131 };
 132
 133 static void release_iso_resource(struct client *, struct client_resource *);
 134
 135 static void schedule_iso_resource(struct iso_resource *r, unsigned long delay)
 136 {
 137         client_get(r->client);
 138         if (!schedule_delayed_work(&r->work, delay))
 139                 client_put(r->client);
 140 }
 141
 142 static void schedule_if_iso_resource(struct client_resource *resource)
 143 {
 144         if (resource->release == release_iso_resource)
 145                 schedule_iso_resource(container_of(resource,
 146                                         struct iso_resource, resource), 0);
 147 }
 148
 149 /*
 150  * dequeue_event() just kfree()'s the event, so the event has to be
 151  * the first field in a struct XYZ_event.
 152  */
 153 struct event {
 154         struct { void *data; size_t size; } v[2];
 155         struct list_head link;
 156 };
 157
 158 struct bus_reset_event {
 159         struct event event;
 160         struct fw_cdev_event_bus_reset reset;
 161 };
 162
 163 struct outbound_transaction_event {
 164         struct event event;
 165         struct client *client;
 166         struct outbound_transaction_resource r;
 167         struct fw_cdev_event_response response;
 168 };
 169
 170 struct inbound_transaction_event {
 171         struct event event;
 172         struct fw_cdev_event_request request;
 173 };
 174
 175 struct iso_interrupt_event {
 176         struct event event;
 177         struct fw_cdev_event_iso_interrupt interrupt;
 178 };
 179
 180 struct iso_resource_event {
 181         struct event event;
 182         struct fw_cdev_event_iso_resource iso_resource;
 183 };
 184
 185 static inline void __user *u64_to_uptr(__u64 value)
 186 {
 187         return (void __user *)(unsigned long)value;
 188 }
 189
 190 static inline __u64 uptr_to_u64(void __user *ptr)
 191 {
 192         return (__u64)(unsigned long)ptr;
 193 }
 194
 195 static int fw_device_op_open(struct inode *inode, struct file *file)
 196 {
 197         struct fw_device *device;
 198         struct client *client;
 199
 200         device = fw_device_get_by_devt(inode->i_rdev);
 201         if (device == NULL)
 202                 return -ENODEV;
 203
 204         if (fw_device_is_shutdown(device)) {
 205                 fw_device_put(device);
 206                 return -ENODEV;
 207         }
 208
 209         client = kzalloc(sizeof(*client), GFP_KERNEL);
 210         if (client == NULL) {
 211                 fw_device_put(device);
 212                 return -ENOMEM;
 213         }
 214
 215         client->device = device;
 216         spin_lock_init(&client->lock);
 217         idr_init(&client->resource_idr);
 218         INIT_LIST_HEAD(&client->event_list);
 219         init_waitqueue_head(&client->wait);
 220         kref_init(&client->kref);
 221
 222         file->private_data = client;
 223
 224         mutex_lock(&device->client_list_mutex);
 225         list_add_tail(&client->link, &device->client_list);
 226         mutex_unlock(&device->client_list_mutex);
 227
 228         return 0;
 229 }
 230
 231 static void queue_event(struct client *client, struct event *event,
 232                         void *data0, size_t size0, void *data1, size_t size1)
 233 {
 234         unsigned long flags;
 235
 236         event->v[0].data = data0;
 237         event->v[0].size = size0;
 238         event->v[1].data = data1;
 239         event->v[1].size = size1;
 240
 241         spin_lock_irqsave(&client->lock, flags);
 242         if (client->in_shutdown)
 243                 kfree(event);
 244         else
 245                 list_add_tail(&event->link, &client->event_list);
 246         spin_unlock_irqrestore(&client->lock, flags);
 247
 248         wake_up_interruptible(&client->wait);
 249 }
 250
 251 static int dequeue_event(struct client *client,
 252                          char __user *buffer, size_t count)
 253 {
 254         struct event *event;
 255         size_t size, total;
 256         int i, ret;
 257
 258         ret = wait_event_interruptible(client->wait,
 259                         !list_empty(&client->event_list) ||
 260                         fw_device_is_shutdown(client->device));
 261         if (ret < 0)
 262                 return ret;
 263
 264         if (list_empty(&client->event_list) &&
 265                        fw_device_is_shutdown(client->device))
 266                 return -ENODEV;
 267
 268         spin_lock_irq(&client->lock);
 269         event = list_first_entry(&client->event_list, struct event, link);
 270         list_del(&event->link);
 271         spin_unlock_irq(&client->lock);
 272
 273         total = 0;
 274         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
 275                 size = min(event->v[i].size, count - total);
 276                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
 277                         ret = -EFAULT;
 278                         goto out;
 279                 }
 280                 total += size;
 281         }
 282         ret = total;
 283
 284  out:
 285         kfree(event);
 286
 287         return ret;
 288 }
 289
 290 static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
 291                                  size_t count, loff_t *offset)
 292 {
 293         struct client *client = file->private_data;
 294
 295         return dequeue_event(client, buffer, count);
 296 }
 297
 298 static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 299                                  struct client *client)
 300 {
 301         struct fw_card *card = client->device->card;
 302
 303         spin_lock_irq(&card->lock);
 304
 305         event->closure       = client->bus_reset_closure;
 306         event->type          = FW_CDEV_EVENT_BUS_RESET;
 307         event->generation    = client->device->generation;
 308         event->node_id       = client->device->node_id;
 309         event->local_node_id = card->local_node->node_id;
 310         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
 311         event->irm_node_id   = card->irm_node->node_id;
 312         event->root_node_id  = card->root_node->node_id;
 313
 314         spin_unlock_irq(&card->lock);
 315 }
 316
 317 static void for_each_client(struct fw_device *device,
 318                             void (*callback)(struct client *client))
 319 {
 320         struct client *c;
 321
 322         mutex_lock(&device->client_list_mutex);
 323         list_for_each_entry(c, &device->client_list, link)
 324                 callback(c);
 325         mutex_unlock(&device->client_list_mutex);
 326 }
 327
 328 static int schedule_reallocations(int id, void *p, void *data)
 329 {
 330         schedule_if_iso_resource(p);
 331
 332         return 0;
 333 }
 334
 335 static void queue_bus_reset_event(struct client *client)
 336 {
 337         struct bus_reset_event *e;
 338
 339         e = kzalloc(sizeof(*e), GFP_KERNEL);
 340         if (e == NULL) {
 341                 fw_notify("Out of memory when allocating bus reset event\n");
 342                 return;
 343         }
 344
 345         fill_bus_reset_event(&e->reset, client);
 346
 347         queue_event(client, &e->event,
 348                     &e->reset, sizeof(e->reset), NULL, 0);
 349
 350         spin_lock_irq(&client->lock);
 351         idr_for_each(&client->resource_idr, schedule_reallocations, client);
 352         spin_unlock_irq(&client->lock);
 353 }
 354
 355 void fw_device_cdev_update(struct fw_device *device)
 356 {
 357         for_each_client(device, queue_bus_reset_event);
 358 }
 359
 360 static void wake_up_client(struct client *client)
 361 {
 362         wake_up_interruptible(&client->wait);
 363 }
 364
 365 void fw_device_cdev_remove(struct fw_device *device)
 366 {
 367         for_each_client(device, wake_up_client);
 368 }
 369
 370 static int ioctl_get_info(struct client *client, void *buffer)
 371 {
 372         struct fw_cdev_get_info *get_info = buffer;
 373         struct fw_cdev_event_bus_reset bus_reset;
 374         unsigned long ret = 0;
 375
 376         client->version = get_info->version;
 377         get_info->version = FW_CDEV_VERSION;
 378         get_info->card = client->device->card->index;
 379
 380         down_read(&fw_device_rwsem);
 381
 382         if (get_info->rom != 0) {
 383                 void __user *uptr = u64_to_uptr(get_info->rom);
 384                 size_t want = get_info->rom_length;
 385                 size_t have = client->device->config_rom_length * 4;
 386
 387                 ret = copy_to_user(uptr, client->device->config_rom,
 388                                    min(want, have));
 389         }
 390         get_info->rom_length = client->device->config_rom_length * 4;
 391
 392         up_read(&fw_device_rwsem);
 393
 394         if (ret != 0)
 395                 return -EFAULT;
 396
 397         client->bus_reset_closure = get_info->bus_reset_closure;
 398         if (get_info->bus_reset != 0) {
 399                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
 400
 401                 fill_bus_reset_event(&bus_reset, client);
 402                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
 403                         return -EFAULT;
 404         }
 405
 406         return 0;
 407 }
 408
 409 static int add_client_resource(struct client *client,
 410                                struct client_resource *resource, gfp_t gfp_mask)
 411 {
 412         unsigned long flags;
 413         int ret;
 414
 415  retry:
 416         if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
 417                 return -ENOMEM;
 418
 419         spin_lock_irqsave(&client->lock, flags);
 420         if (client->in_shutdown)
 421                 ret = -ECANCELED;
 422         else
 423                 ret = idr_get_new(&client->resource_idr, resource,
 424                                   &resource->handle);
 425         if (ret >= 0) {
 426                 client_get(client);
 427                 schedule_if_iso_resource(resource);
 428         }
 429         spin_unlock_irqrestore(&client->lock, flags);
 430
 431         if (ret == -EAGAIN)
 432                 goto retry;
 433
 434         return ret < 0 ? ret : 0;
 435 }
 436
 437 static int release_client_resource(struct client *client, u32 handle,
 438                                    client_resource_release_fn_t release,
 439                                    struct client_resource **return_resource)
 440 {
 441         struct client_resource *resource;
 442
 443         spin_lock_irq(&client->lock);
 444         if (client->in_shutdown)
 445                 resource = NULL;
 446         else
 447                 resource = idr_find(&client->resource_idr, handle);
 448         if (resource && resource->release == release)
 449                 idr_remove(&client->resource_idr, handle);
 450         spin_unlock_irq(&client->lock);
 451
 452         if (!(resource && resource->release == release))
 453                 return -EINVAL;
 454
 455         if (return_resource)
 456                 *return_resource = resource;
 457         else
 458                 resource->release(client, resource);
 459
 460         client_put(client);
 461
 462         return 0;
 463 }
 464
 465 static void release_transaction(struct client *client,
 466                                 struct client_resource *resource)
 467 {
 468         struct outbound_transaction_resource *r = container_of(resource,
 469                         struct outbound_transaction_resource, resource);
 470
 471         fw_cancel_transaction(client->device->card, &r->transaction);
 472 }
 473
 474 static void complete_transaction(struct fw_card *card, int rcode,
 475                                  void *payload, size_t length, void *data)
 476 {
 477         struct outbound_transaction_event *e = data;
 478         struct fw_cdev_event_response *rsp = &e->response;
 479         struct client *client = e->client;
 480         unsigned long flags;
 481
 482         if (length < rsp->length)
 483                 rsp->length = length;
 484         if (rcode == RCODE_COMPLETE)
 485                 memcpy(rsp->data, payload, rsp->length);
 486
 487         spin_lock_irqsave(&client->lock, flags);
 488         /*
 489          * 1. If called while in shutdown, the idr tree must be left untouched.
 490          *    The idr handle will be removed and the client reference will be
 491          *    dropped later.
 492          * 2. If the call chain was release_client_resource ->
 493          *    release_transaction -> complete_transaction (instead of a normal
 494          *    conclusion of the transaction), i.e. if this resource was already
 495          *    unregistered from the idr, the client reference will be dropped
 496          *    by release_client_resource and we must not drop it here.
 497          */
 498         if (!client->in_shutdown &&
 499             idr_find(&client->resource_idr, e->r.resource.handle)) {
 500                 idr_remove(&client->resource_idr, e->r.resource.handle);
 501                 /* Drop the idr's reference */
 502                 client_put(client);
 503         }
 504         spin_unlock_irqrestore(&client->lock, flags);
 505
 506         rsp->type = FW_CDEV_EVENT_RESPONSE;
 507         rsp->rcode = rcode;
 508
 509         /*
 510          * In the case that sizeof(*rsp) doesn't align with the position of the
 511          * data, and the read is short, preserve an extra copy of the data
 512          * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
 513          * for short reads and some apps depended on it, this is both safe
 514          * and prudent for compatibility.
 515          */
 516         if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
 517                 queue_event(client, &e->event, rsp, sizeof(*rsp),
 518                             rsp->data, rsp->length);
 519         else
 520                 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
 521                             NULL, 0);
 522
 523         /* Drop the transaction callback's reference */
 524         client_put(client);
 525 }
 526
 527 static int init_request(struct client *client,
 528                         struct fw_cdev_send_request *request,
 529                         int destination_id, int speed)
 530 {
 531         struct outbound_transaction_event *e;
 532         int ret;
 533
 534         if (request->tcode != TCODE_STREAM_DATA &&
 535             (request->length > 4096 || request->length > 512 << speed))
 536                 return -EIO;
 537
 538         e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
 539         if (e == NULL)
 540                 return -ENOMEM;
 541
 542         e->client = client;
 543         e->response.length = request->length;
 544         e->response.closure = request->closure;
 545
 546         if (request->data &&
 547             copy_from_user(e->response.data,
 548                            u64_to_uptr(request->data), request->length)) {
 549                 ret = -EFAULT;
 550                 goto failed;
 551         }
 552
 553         e->r.resource.release = release_transaction;
 554         ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
 555         if (ret < 0)
 556                 goto failed;
 557
 558         /* Get a reference for the transaction callback */
 559         client_get(client);
 560
 561         fw_send_request(client->device->card, &e->r.transaction,
 562                         request->tcode, destination_id, request->generation,
 563                         speed, request->offset, e->response.data,
 564                         request->length, complete_transaction, e);
 565         return 0;
 566
 567  failed:
 568         kfree(e);
 569
 570         return ret;
 571 }
 572
 573 static int ioctl_send_request(struct client *client, void *buffer)
 574 {
 575         struct fw_cdev_send_request *request = buffer;
 576
 577         switch (request->tcode) {
 578         case TCODE_WRITE_QUADLET_REQUEST:
 579         case TCODE_WRITE_BLOCK_REQUEST:
 580         case TCODE_READ_QUADLET_REQUEST:
 581         case TCODE_READ_BLOCK_REQUEST:
 582         case TCODE_LOCK_MASK_SWAP:
 583         case TCODE_LOCK_COMPARE_SWAP:
 584         case TCODE_LOCK_FETCH_ADD:
 585         case TCODE_LOCK_LITTLE_ADD:
 586         case TCODE_LOCK_BOUNDED_ADD:
 587         case TCODE_LOCK_WRAP_ADD:
 588         case TCODE_LOCK_VENDOR_DEPENDENT:
 589                 break;
 590         default:
 591                 return -EINVAL;
 592         }
 593
 594         return init_request(client, request, client->device->node_id,
 595                             client->device->max_speed);
 596 }
 597
 598 static void release_request(struct client *client,
 599                             struct client_resource *resource)
 600 {
 601         struct inbound_transaction_resource *r = container_of(resource,
 602                         struct inbound_transaction_resource, resource);
 603
 604         fw_send_response(client->device->card, r->request,
 605                          RCODE_CONFLICT_ERROR);
 606         kfree(r);
 607 }
 608
 609 static void handle_request(struct fw_card *card, struct fw_request *request,
 610                            int tcode, int destination, int source,
 611                            int generation, int speed,
 612                            unsigned long long offset,
 613                            void *payload, size_t length, void *callback_data)
 614 {
 615         struct address_handler_resource *handler = callback_data;
 616         struct inbound_transaction_resource *r;
 617         struct inbound_transaction_event *e;
 618         int ret;
 619
 620         r = kmalloc(sizeof(*r), GFP_ATOMIC);
 621         e = kmalloc(sizeof(*e), GFP_ATOMIC);
 622         if (r == NULL || e == NULL)
 623                 goto failed;
 624
 625         r->request = request;
 626         r->data    = payload;
 627         r->length  = length;
 628
 629         r->resource.release = release_request;
 630         ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
 631         if (ret < 0)
 632                 goto failed;
 633
 634         e->request.type    = FW_CDEV_EVENT_REQUEST;
 635         e->request.tcode   = tcode;
 636         e->request.offset  = offset;
 637         e->request.length  = length;
 638         e->request.handle  = r->resource.handle;
 639         e->request.closure = handler->closure;
 640
 641         queue_event(handler->client, &e->event,
 642                     &e->request, sizeof(e->request), payload, length);
 643         return;
 644
 645  failed:
 646         kfree(r);
 647         kfree(e);
 648         fw_send_response(card, request, RCODE_CONFLICT_ERROR);
 649 }
 650
 651 static void release_address_handler(struct client *client,
 652                                     struct client_resource *resource)
 653 {
 654         struct address_handler_resource *r =
 655             container_of(resource, struct address_handler_resource, resource);
 656
 657         fw_core_remove_address_handler(&r->handler);
 658         kfree(r);
 659 }
 660
 661 static int ioctl_allocate(struct client *client, void *buffer)
 662 {
 663         struct fw_cdev_allocate *request = buffer;
 664         struct address_handler_resource *r;
 665         struct fw_address_region region;
 666         int ret;
 667
 668         r = kmalloc(sizeof(*r), GFP_KERNEL);
 669         if (r == NULL)
 670                 return -ENOMEM;
 671
 672         region.start = request->offset;
 673         region.end = request->offset + request->length;
 674         r->handler.length = request->length;
 675         r->handler.address_callback = handle_request;
 676         r->handler.callback_data = r;
 677         r->closure = request->closure;
 678         r->client = client;
 679
 680         ret = fw_core_add_address_handler(&r->handler, &region);
 681         if (ret < 0) {
 682                 kfree(r);
 683                 return ret;
 684         }
 685
 686         r->resource.release = release_address_handler;
 687         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 688         if (ret < 0) {
 689                 release_address_handler(client, &r->resource);
 690                 return ret;
 691         }
 692         request->handle = r->resource.handle;
 693
 694         return 0;
 695 }
 696
 697 static int ioctl_deallocate(struct client *client, void *buffer)
 698 {
 699         struct fw_cdev_deallocate *request = buffer;
 700
 701         return release_client_resource(client, request->handle,
 702                                        release_address_handler, NULL);
 703 }
 704
 705 static int ioctl_send_response(struct client *client, void *buffer)
 706 {
 707         struct fw_cdev_send_response *request = buffer;
 708         struct client_resource *resource;
 709         struct inbound_transaction_resource *r;
 710         int ret = 0;
 711
 712         if (release_client_resource(client, request->handle,
 713                                     release_request, &resource) < 0)
 714                 return -EINVAL;
 715
 716         r = container_of(resource, struct inbound_transaction_resource,
 717                          resource);
 718         if (request->length < r->length)
 719                 r->length = request->length;
 720
 721         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length)) {
 722                 ret = -EFAULT;
 723                 goto out;
 724         }
 725
 726         fw_send_response(client->device->card, r->request, request->rcode);
 727  out:
 728         kfree(r);
 729
 730         return ret;
 731 }
 732
 733 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
 734 {
 735         struct fw_cdev_initiate_bus_reset *request = buffer;
 736         int short_reset;
 737
 738         short_reset = (request->type == FW_CDEV_SHORT_RESET);
 739
 740         return fw_core_initiate_bus_reset(client->device->card, short_reset);
 741 }
 742
 743 static void release_descriptor(struct client *client,
 744                                struct client_resource *resource)
 745 {
 746         struct descriptor_resource *r =
 747                 container_of(resource, struct descriptor_resource, resource);
 748
 749         fw_core_remove_descriptor(&r->descriptor);
 750         kfree(r);
 751 }
 752
 753 static int ioctl_add_descriptor(struct client *client, void *buffer)
 754 {
 755         struct fw_cdev_add_descriptor *request = buffer;
 756         struct descriptor_resource *r;
 757         int ret;
 758
 759         /* Access policy: Allow this ioctl only on local nodes' device files. */
 760         if (!client->device->is_local)
 761                 return -ENOSYS;
 762
 763         if (request->length > 256)
 764                 return -EINVAL;
 765
 766         r = kmalloc(sizeof(*r) + request->length * 4, GFP_KERNEL);
 767         if (r == NULL)
 768                 return -ENOMEM;
 769
 770         if (copy_from_user(r->data,
 771                            u64_to_uptr(request->data), request->length * 4)) {
 772                 ret = -EFAULT;
 773                 goto failed;
 774         }
 775
 776         r->descriptor.length    = request->length;
 777         r->descriptor.immediate = request->immediate;
 778         r->descriptor.key       = request->key;
 779         r->descriptor.data      = r->data;
 780
 781         ret = fw_core_add_descriptor(&r->descriptor);
 782         if (ret < 0)
 783                 goto failed;
 784
 785         r->resource.release = release_descriptor;
 786         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 787         if (ret < 0) {
 788                 fw_core_remove_descriptor(&r->descriptor);
 789                 goto failed;
 790         }
 791         request->handle = r->resource.handle;
 792
 793         return 0;
 794  failed:
 795         kfree(r);
 796
 797         return ret;
 798 }
 799
 800 static int ioctl_remove_descriptor(struct client *client, void *buffer)
 801 {
 802         struct fw_cdev_remove_descriptor *request = buffer;
 803
 804         return release_client_resource(client, request->handle,
 805                                        release_descriptor, NULL);
 806 }
 807
 808 static void iso_callback(struct fw_iso_context *context, u32 cycle,
 809                          size_t header_length, void *header, void *data)
 810 {
 811         struct client *client = data;
 812         struct iso_interrupt_event *e;
 813
 814         e = kzalloc(sizeof(*e) + header_length, GFP_ATOMIC);
 815         if (e == NULL)
 816                 return;
 817
 818         e->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 819         e->interrupt.closure   = client->iso_closure;
 820         e->interrupt.cycle     = cycle;
 821         e->interrupt.header_length = header_length;
 822         memcpy(e->interrupt.header, header, header_length);
 823         queue_event(client, &e->event, &e->interrupt,
 824                     sizeof(e->interrupt) + header_length, NULL, 0);
 825 }
 826
 827 static int ioctl_create_iso_context(struct client *client, void *buffer)
 828 {
 829         struct fw_cdev_create_iso_context *request = buffer;
 830         struct fw_iso_context *context;
 831
 832         /* We only support one context at this time. */
 833         if (client->iso_context != NULL)
 834                 return -EBUSY;
 835
 836         if (request->channel > 63)
 837                 return -EINVAL;
 838
 839         switch (request->type) {
 840         case FW_ISO_CONTEXT_RECEIVE:
 841                 if (request->header_size < 4 || (request->header_size & 3))
 842                         return -EINVAL;
 843
 844                 break;
 845
 846         case FW_ISO_CONTEXT_TRANSMIT:
 847                 if (request->speed > SCODE_3200)
 848                         return -EINVAL;
 849
 850                 break;
 851
 852         default:
 853                 return -EINVAL;
 854         }
 855
 856         context =  fw_iso_context_create(client->device->card,
 857                                          request->type,
 858                                          request->channel,
 859                                          request->speed,
 860                                          request->header_size,
 861                                          iso_callback, client);
 862         if (IS_ERR(context))
 863                 return PTR_ERR(context);
 864
 865         client->iso_closure = request->closure;
 866         client->iso_context = context;
 867
 868         /* We only support one context at this time. */
 869         request->handle = 0;
 870
 871         return 0;
 872 }
 873
 874 /* Macros for decoding the iso packet control header. */
 875 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
 876 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
 877 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
 878 #define GET_TAG(v)              (((v) >> 18) & 0x03)
 879 #define GET_SY(v)               (((v) >> 20) & 0x0f)
 880 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
 881
 882 static int ioctl_queue_iso(struct client *client, void *buffer)
 883 {
 884         struct fw_cdev_queue_iso *request = buffer;
 885         struct fw_cdev_iso_packet __user *p, *end, *next;
 886         struct fw_iso_context *ctx = client->iso_context;
 887         unsigned long payload, buffer_end, header_length;
 888         u32 control;
 889         int count;
 890         struct {
 891                 struct fw_iso_packet packet;
 892                 u8 header[256];
 893         } u;
 894
 895         if (ctx == NULL || request->handle != 0)
 896                 return -EINVAL;
 897
 898         /*
 899          * If the user passes a non-NULL data pointer, has mmap()'ed
 900          * the iso buffer, and the pointer points inside the buffer,
 901          * we setup the payload pointers accordingly.  Otherwise we
 902          * set them both to 0, which will still let packets with
 903          * payload_length == 0 through.  In other words, if no packets
 904          * use the indirect payload, the iso buffer need not be mapped
 905          * and the request->data pointer is ignored.
 906          */
 907
 908         payload = (unsigned long)request->data - client->vm_start;
 909         buffer_end = client->buffer.page_count << PAGE_SHIFT;
 910         if (request->data == 0 || client->buffer.pages == NULL ||
 911             payload >= buffer_end) {
 912                 payload = 0;
 913                 buffer_end = 0;
 914         }
 915
 916         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
 917
 918         if (!access_ok(VERIFY_READ, p, request->size))
 919                 return -EFAULT;
 920
 921         end = (void __user *)p + request->size;
 922         count = 0;
 923         while (p < end) {
 924                 if (get_user(control, &p->control))
 925                         return -EFAULT;
 926                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
 927                 u.packet.interrupt = GET_INTERRUPT(control);
 928                 u.packet.skip = GET_SKIP(control);
 929                 u.packet.tag = GET_TAG(control);
 930                 u.packet.sy = GET_SY(control);
 931                 u.packet.header_length = GET_HEADER_LENGTH(control);
 932
 933                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 934                         header_length = u.packet.header_length;
 935                 } else {
 936                         /*
 937                          * We require that header_length is a multiple of
 938                          * the fixed header size, ctx->header_size.
 939                          */
 940                         if (ctx->header_size == 0) {
 941                                 if (u.packet.header_length > 0)
 942                                         return -EINVAL;
 943                         } else if (u.packet.header_length % ctx->header_size != 0) {
 944                                 return -EINVAL;
 945                         }
 946                         header_length = 0;
 947                 }
 948
 949                 next = (struct fw_cdev_iso_packet __user *)
 950                         &p->header[header_length / 4];
 951                 if (next > end)
 952                         return -EINVAL;
 953                 if (__copy_from_user
 954                     (u.packet.header, p->header, header_length))
 955                         return -EFAULT;
 956                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 957                     u.packet.header_length + u.packet.payload_length > 0)
 958                         return -EINVAL;
 959                 if (payload + u.packet.payload_length > buffer_end)
 960                         return -EINVAL;
 961
 962                 if (fw_iso_context_queue(ctx, &u.packet,
 963                                          &client->buffer, payload))
 964                         break;
 965
 966                 p = next;
 967                 payload += u.packet.payload_length;
 968                 count++;
 969         }
 970
 971         request->size    -= uptr_to_u64(p) - request->packets;
 972         request->packets  = uptr_to_u64(p);
 973         request->data     = client->vm_start + payload;
 974
 975         return count;
 976 }
 977
 978 static int ioctl_start_iso(struct client *client, void *buffer)
 979 {
 980         struct fw_cdev_start_iso *request = buffer;
 981
 982         if (client->iso_context == NULL || request->handle != 0)
 983                 return -EINVAL;
 984
 985         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
 986                 if (request->tags == 0 || request->tags > 15)
 987                         return -EINVAL;
 988
 989                 if (request->sync > 15)
 990                         return -EINVAL;
 991         }
 992
 993         return fw_iso_context_start(client->iso_context, request->cycle,
 994                                     request->sync, request->tags);
 995 }
 996
 997 static int ioctl_stop_iso(struct client *client, void *buffer)
 998 {
 999         struct fw_cdev_stop_iso *request = buffer;
1000
1001         if (client->iso_context == NULL || request->handle != 0)
1002                 return -EINVAL;
1003
1004         return fw_iso_context_stop(client->iso_context);
1005 }
1006
1007 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
1008 {
1009         struct fw_cdev_get_cycle_timer *request = buffer;
1010         struct fw_card *card = client->device->card;
1011         unsigned long long bus_time;
1012         struct timeval tv;
1013         unsigned long flags;
1014
1015         preempt_disable();
1016         local_irq_save(flags);
1017
1018         bus_time = card->driver->get_bus_time(card);
1019         do_gettimeofday(&tv);
1020
1021         local_irq_restore(flags);
1022         preempt_enable();
1023
1024         request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
1025         request->cycle_timer = bus_time & 0xffffffff;
1026         return 0;
1027 }
1028
1029 static void iso_resource_work(struct work_struct *work)
1030 {
1031         struct iso_resource_event *e;
1032         struct iso_resource *r =
1033                         container_of(work, struct iso_resource, work.work);
1034         struct client *client = r->client;
1035         int generation, channel, bandwidth, todo;
1036         bool skip, free, success;
1037
1038         spin_lock_irq(&client->lock);
1039         generation = client->device->generation;
1040         todo = r->todo;
1041         /* Allow 1000ms grace period for other reallocations. */
1042         if (todo == ISO_RES_ALLOC &&
1043             time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
1044                 schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3));
1045                 skip = true;
1046         } else {
1047                 /* We could be called twice within the same generation. */
1048                 skip = todo == ISO_RES_REALLOC &&
1049                        r->generation == generation;
1050         }
1051         free = todo == ISO_RES_DEALLOC ||
1052                todo == ISO_RES_ALLOC_ONCE ||
1053                todo == ISO_RES_DEALLOC_ONCE;
1054         r->generation = generation;
1055         spin_unlock_irq(&client->lock);
1056
1057         if (skip)
1058                 goto out;
1059
1060         bandwidth = r->bandwidth;
1061
1062         fw_iso_resource_manage(client->device->card, generation,
1063                         r->channels, &channel, &bandwidth,
1064                         todo == ISO_RES_ALLOC ||
1065                         todo == ISO_RES_REALLOC ||
1066                         todo == ISO_RES_ALLOC_ONCE,
1067                         r->transaction_data);
1068         /*
1069          * Is this generation outdated already?  As long as this resource sticks
1070          * in the idr, it will be scheduled again for a newer generation or at
1071          * shutdown.
1072          */
1073         if (channel == -EAGAIN &&
1074             (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
1075                 goto out;
1076
1077         success = channel >= 0 || bandwidth > 0;
1078
1079         spin_lock_irq(&client->lock);
1080         /*
1081          * Transit from allocation to reallocation, except if the client
1082          * requested deallocation in the meantime.
1083          */
1084         if (r->todo == ISO_RES_ALLOC)
1085                 r->todo = ISO_RES_REALLOC;
1086         /*
1087          * Allocation or reallocation failure?  Pull this resource out of the
1088          * idr and prepare for deletion, unless the client is shutting down.
1089          */
1090         if (r->todo == ISO_RES_REALLOC && !success &&
1091             !client->in_shutdown &&
1092             idr_find(&client->resource_idr, r->resource.handle)) {
1093                 idr_remove(&client->resource_idr, r->resource.handle);
1094                 client_put(client);
1095                 free = true;
1096         }
1097         spin_unlock_irq(&client->lock);
1098
1099         if (todo == ISO_RES_ALLOC && channel >= 0)
1100                 r->channels = 1ULL << channel;
1101
1102         if (todo == ISO_RES_REALLOC && success)
1103                 goto out;
1104
1105         if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
1106                 e = r->e_alloc;
1107                 r->e_alloc = NULL;
1108         } else {
1109                 e = r->e_dealloc;
1110                 r->e_dealloc = NULL;
1111         }
1112         e->iso_resource.handle    = r->resource.handle;
1113         e->iso_resource.channel   = channel;
1114         e->iso_resource.bandwidth = bandwidth;
1115
1116         queue_event(client, &e->event,
1117                     &e->iso_resource, sizeof(e->iso_resource), NULL, 0);
1118
1119         if (free) {
1120                 cancel_delayed_work(&r->work);
1121                 kfree(r->e_alloc);
1122                 kfree(r->e_dealloc);
1123                 kfree(r);
1124         }
1125  out:
1126         client_put(client);
1127 }
1128
1129 static void release_iso_resource(struct client *client,
1130                                  struct client_resource *resource)
1131 {
1132         struct iso_resource *r =
1133                 container_of(resource, struct iso_resource, resource);
1134
1135         spin_lock_irq(&client->lock);
1136         r->todo = ISO_RES_DEALLOC;
1137         schedule_iso_resource(r, 0);
1138         spin_unlock_irq(&client->lock);
1139 }
1140
1141 static int init_iso_resource(struct client *client,
1142                 struct fw_cdev_allocate_iso_resource *request, int todo)
1143 {
1144         struct iso_resource_event *e1, *e2;
1145         struct iso_resource *r;
1146         int ret;
1147
1148         if ((request->channels == 0 && request->bandwidth == 0) ||
1149             request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL ||
1150             request->bandwidth < 0)
1151                 return -EINVAL;
1152
1153         r  = kmalloc(sizeof(*r), GFP_KERNEL);
1154         e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
1155         e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
1156         if (r == NULL || e1 == NULL || e2 == NULL) {
1157                 ret = -ENOMEM;
1158                 goto fail;
1159         }
1160
1161         INIT_DELAYED_WORK(&r->work, iso_resource_work);
1162         r->client       = client;
1163         r->todo         = todo;
1164         r->generation   = -1;
1165         r->channels     = request->channels;
1166         r->bandwidth    = request->bandwidth;
1167         r->e_alloc      = e1;
1168         r->e_dealloc    = e2;
1169
1170         e1->iso_resource.closure = request->closure;
1171         e1->iso_resource.type    = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
1172         e2->iso_resource.closure = request->closure;
1173         e2->iso_resource.type    = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
1174
1175         if (todo == ISO_RES_ALLOC) {
1176                 r->resource.release = release_iso_resource;
1177                 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
1178                 if (ret < 0)
1179                         goto fail;
1180         } else {
1181                 r->resource.release = NULL;
1182                 r->resource.handle = -1;
1183                 schedule_iso_resource(r, 0);
1184         }
1185         request->handle = r->resource.handle;
1186
1187         return 0;
1188  fail:
1189         kfree(r);
1190         kfree(e1);
1191         kfree(e2);
1192
1193         return ret;
1194 }
1195
1196 static int ioctl_allocate_iso_resource(struct client *client, void *buffer)
1197 {
1198         struct fw_cdev_allocate_iso_resource *request = buffer;
1199
1200         return init_iso_resource(client, request, ISO_RES_ALLOC);
1201 }
1202
1203 static int ioctl_deallocate_iso_resource(struct client *client, void *buffer)
1204 {
1205         struct fw_cdev_deallocate *request = buffer;
1206
1207         return release_client_resource(client, request->handle,
1208                                        release_iso_resource, NULL);
1209 }
1210
1211 static int ioctl_allocate_iso_resource_once(struct client *client, void *buffer)
1212 {
1213         struct fw_cdev_allocate_iso_resource *request = buffer;
1214
1215         return init_iso_resource(client, request, ISO_RES_ALLOC_ONCE);
1216 }
1217
1218 static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffer)
1219 {
1220         struct fw_cdev_allocate_iso_resource *request = buffer;
1221
1222         return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE);
1223 }
1224
1225 /*
1226  * Returns a speed code:  Maximum speed to or from this device,
1227  * limited by the device's link speed, the local node's link speed,
1228  * and all PHY port speeds between the two links.
1229  */
1230 static int ioctl_get_speed(struct client *client, void *buffer)
1231 {
1232         return client->device->max_speed;
1233 }
1234
1235 static int ioctl_send_broadcast_request(struct client *client, void *buffer)
1236 {
1237         struct fw_cdev_send_request *request = buffer;
1238
1239         switch (request->tcode) {
1240         case TCODE_WRITE_QUADLET_REQUEST:
1241         case TCODE_WRITE_BLOCK_REQUEST:
1242                 break;
1243         default:
1244                 return -EINVAL;
1245         }
1246
1247         /* Security policy: Only allow accesses to Units Space. */
1248         if (request->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
1249                 return -EACCES;
1250
1251         return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100);
1252 }
1253
1254 static int ioctl_send_stream_packet(struct client *client, void *buffer)
1255 {
1256         struct fw_cdev_send_stream_packet *p = buffer;
1257         struct fw_cdev_send_request request;
1258         int dest;
1259
1260         if (p->speed > client->device->card->link_speed ||
1261             p->length > 1024 << p->speed)
1262                 return -EIO;
1263
1264         if (p->tag > 3 || p->channel > 63 || p->sy > 15)
1265                 return -EINVAL;
1266
1267         dest = fw_stream_packet_destination_id(p->tag, p->channel, p->sy);
1268         request.tcode           = TCODE_STREAM_DATA;
1269         request.length          = p->length;
1270         request.closure         = p->closure;
1271         request.data            = p->data;
1272         request.generation      = p->generation;
1273
1274         return init_request(client, &request, dest, p->speed);
1275 }
1276
1277 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
1278         ioctl_get_info,
1279         ioctl_send_request,
1280         ioctl_allocate,
1281         ioctl_deallocate,
1282         ioctl_send_response,
1283         ioctl_initiate_bus_reset,
1284         ioctl_add_descriptor,
1285         ioctl_remove_descriptor,
1286         ioctl_create_iso_context,
1287         ioctl_queue_iso,
1288         ioctl_start_iso,
1289         ioctl_stop_iso,
1290         ioctl_get_cycle_timer,
1291         ioctl_allocate_iso_resource,
1292         ioctl_deallocate_iso_resource,
1293         ioctl_allocate_iso_resource_once,
1294         ioctl_deallocate_iso_resource_once,
1295         ioctl_get_speed,
1296         ioctl_send_broadcast_request,
1297         ioctl_send_stream_packet,
1298 };
1299
1300 static int dispatch_ioctl(struct client *client,
1301                           unsigned int cmd, void __user *arg)
1302 {
1303         char buffer[sizeof(union {
1304                 struct fw_cdev_get_info                 _00;
1305                 struct fw_cdev_send_request             _01;
1306                 struct fw_cdev_allocate                 _02;
1307                 struct fw_cdev_deallocate               _03;
1308                 struct fw_cdev_send_response            _04;
1309                 struct fw_cdev_initiate_bus_reset       _05;
1310                 struct fw_cdev_add_descriptor           _06;
1311                 struct fw_cdev_remove_descriptor        _07;
1312                 struct fw_cdev_create_iso_context       _08;
1313                 struct fw_cdev_queue_iso                _09;
1314                 struct fw_cdev_start_iso                _0a;
1315                 struct fw_cdev_stop_iso                 _0b;
1316                 struct fw_cdev_get_cycle_timer          _0c;
1317                 struct fw_cdev_allocate_iso_resource    _0d;
1318                 struct fw_cdev_send_stream_packet       _13;
1319         })];
1320         int ret;
1321
1322         if (_IOC_TYPE(cmd) != '#' ||
1323             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
1324                 return -EINVAL;
1325
1326         if (_IOC_DIR(cmd) & _IOC_WRITE) {
1327                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1328                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
1329                         return -EFAULT;
1330         }
1331
1332         ret = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
1333         if (ret < 0)
1334                 return ret;
1335
1336         if (_IOC_DIR(cmd) & _IOC_READ) {
1337                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1338                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
1339                         return -EFAULT;
1340         }
1341
1342         return ret;
1343 }
1344
1345 static long fw_device_op_ioctl(struct file *file,
1346                                unsigned int cmd, unsigned long arg)
1347 {
1348         struct client *client = file->private_data;
1349
1350         if (fw_device_is_shutdown(client->device))
1351                 return -ENODEV;
1352
1353         return dispatch_ioctl(client, cmd, (void __user *) arg);
1354 }
1355
1356 #ifdef CONFIG_COMPAT
1357 static long fw_device_op_compat_ioctl(struct file *file,
1358                                       unsigned int cmd, unsigned long arg)
1359 {
1360         struct client *client = file->private_data;
1361
1362         if (fw_device_is_shutdown(client->device))
1363                 return -ENODEV;
1364
1365         return dispatch_ioctl(client, cmd, compat_ptr(arg));
1366 }
1367 #endif
1368
1369 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
1370 {
1371         struct client *client = file->private_data;
1372         enum dma_data_direction direction;
1373         unsigned long size;
1374         int page_count, ret;
1375
1376         if (fw_device_is_shutdown(client->device))
1377                 return -ENODEV;
1378
1379         /* FIXME: We could support multiple buffers, but we don't. */
1380         if (client->buffer.pages != NULL)
1381                 return -EBUSY;
1382
1383         if (!(vma->vm_flags & VM_SHARED))
1384                 return -EINVAL;
1385
1386         if (vma->vm_start & ~PAGE_MASK)
1387                 return -EINVAL;
1388
1389         client->vm_start = vma->vm_start;
1390         size = vma->vm_end - vma->vm_start;
1391         page_count = size >> PAGE_SHIFT;
1392         if (size & ~PAGE_MASK)
1393                 return -EINVAL;
1394
1395         if (vma->vm_flags & VM_WRITE)
1396                 direction = DMA_TO_DEVICE;
1397         else
1398                 direction = DMA_FROM_DEVICE;
1399
1400         ret = fw_iso_buffer_init(&client->buffer, client->device->card,
1401                                  page_count, direction);
1402         if (ret < 0)
1403                 return ret;
1404
1405         ret = fw_iso_buffer_map(&client->buffer, vma);
1406         if (ret < 0)
1407                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1408
1409         return ret;
1410 }
1411
1412 static int shutdown_resource(int id, void *p, void *data)
1413 {
1414         struct client_resource *resource = p;
1415         struct client *client = data;
1416
1417         resource->release(client, resource);
1418         client_put(client);
1419
1420         return 0;
1421 }
1422
1423 static int fw_device_op_release(struct inode *inode, struct file *file)
1424 {
1425         struct client *client = file->private_data;
1426         struct event *event, *next_event;
1427
1428         mutex_lock(&client->device->client_list_mutex);
1429         list_del(&client->link);
1430         mutex_unlock(&client->device->client_list_mutex);
1431
1432         if (client->iso_context)
1433                 fw_iso_context_destroy(client->iso_context);
1434
1435         if (client->buffer.pages)
1436                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1437
1438         /* Freeze client->resource_idr and client->event_list */
1439         spin_lock_irq(&client->lock);
1440         client->in_shutdown = true;
1441         spin_unlock_irq(&client->lock);
1442
1443         idr_for_each(&client->resource_idr, shutdown_resource, client);
1444         idr_remove_all(&client->resource_idr);
1445         idr_destroy(&client->resource_idr);
1446
1447         list_for_each_entry_safe(event, next_event, &client->event_list, link)
1448                 kfree(event);
1449
1450         client_put(client);
1451
1452         return 0;
1453 }
1454
1455 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
1456 {
1457         struct client *client = file->private_data;
1458         unsigned int mask = 0;
1459
1460         poll_wait(file, &client->wait, pt);
1461
1462         if (fw_device_is_shutdown(client->device))
1463                 mask |= POLLHUP | POLLERR;
1464         if (!list_empty(&client->event_list))
1465                 mask |= POLLIN | POLLRDNORM;
1466
1467         return mask;
1468 }
1469
1470 const struct file_operations fw_device_ops = {
1471         .owner          = THIS_MODULE,
1472         .open           = fw_device_op_open,
1473         .read           = fw_device_op_read,
1474         .unlocked_ioctl = fw_device_op_ioctl,
1475         .poll           = fw_device_op_poll,
1476         .release        = fw_device_op_release,
1477         .mmap           = fw_device_op_mmap,
1478
1479 #ifdef CONFIG_COMPAT
1480         .compat_ioctl   = fw_device_op_compat_ioctl,
1481 #endif
1482 };