SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/firewire/fw-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-cdev.h>
  26 #include <linux/idr.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/kernel.h>
  29 #include <linux/kref.h>
  30 #include <linux/mm.h>
  31 #include <linux/module.h>
  32 #include <linux/mutex.h>
  33 #include <linux/poll.h>
  34 #include <linux/preempt.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/time.h>
  37 #include <linux/vmalloc.h>
  38 #include <linux/wait.h>
  39 #include <linux/workqueue.h>
  40
  41 #include <asm/system.h>
  42 #include <asm/uaccess.h>
  43
  44 #include "fw-device.h"
  45 #include "fw-topology.h"
  46 #include "fw-transaction.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         struct iso_resource_event *e_alloc, *e_dealloc;
 130 };
 131
 132 static void schedule_iso_resource(struct iso_resource *);
 133 static void release_iso_resource(struct client *, struct client_resource *);
 134
 135 /*
 136  * dequeue_event() just kfree()'s the event, so the event has to be
 137  * the first field in a struct XYZ_event.
 138  */
 139 struct event {
 140         struct { void *data; size_t size; } v[2];
 141         struct list_head link;
 142 };
 143
 144 struct bus_reset_event {
 145         struct event event;
 146         struct fw_cdev_event_bus_reset reset;
 147 };
 148
 149 struct outbound_transaction_event {
 150         struct event event;
 151         struct client *client;
 152         struct outbound_transaction_resource r;
 153         struct fw_cdev_event_response response;
 154 };
 155
 156 struct inbound_transaction_event {
 157         struct event event;
 158         struct fw_cdev_event_request request;
 159 };
 160
 161 struct iso_interrupt_event {
 162         struct event event;
 163         struct fw_cdev_event_iso_interrupt interrupt;
 164 };
 165
 166 struct iso_resource_event {
 167         struct event event;
 168         struct fw_cdev_event_iso_resource resource;
 169 };
 170
 171 static inline void __user *u64_to_uptr(__u64 value)
 172 {
 173         return (void __user *)(unsigned long)value;
 174 }
 175
 176 static inline __u64 uptr_to_u64(void __user *ptr)
 177 {
 178         return (__u64)(unsigned long)ptr;
 179 }
 180
 181 static int fw_device_op_open(struct inode *inode, struct file *file)
 182 {
 183         struct fw_device *device;
 184         struct client *client;
 185
 186         device = fw_device_get_by_devt(inode->i_rdev);
 187         if (device == NULL)
 188                 return -ENODEV;
 189
 190         if (fw_device_is_shutdown(device)) {
 191                 fw_device_put(device);
 192                 return -ENODEV;
 193         }
 194
 195         client = kzalloc(sizeof(*client), GFP_KERNEL);
 196         if (client == NULL) {
 197                 fw_device_put(device);
 198                 return -ENOMEM;
 199         }
 200
 201         client->device = device;
 202         spin_lock_init(&client->lock);
 203         idr_init(&client->resource_idr);
 204         INIT_LIST_HEAD(&client->event_list);
 205         init_waitqueue_head(&client->wait);
 206         kref_init(&client->kref);
 207
 208         file->private_data = client;
 209
 210         mutex_lock(&device->client_list_mutex);
 211         list_add_tail(&client->link, &device->client_list);
 212         mutex_unlock(&device->client_list_mutex);
 213
 214         return 0;
 215 }
 216
 217 static void queue_event(struct client *client, struct event *event,
 218                         void *data0, size_t size0, void *data1, size_t size1)
 219 {
 220         unsigned long flags;
 221
 222         event->v[0].data = data0;
 223         event->v[0].size = size0;
 224         event->v[1].data = data1;
 225         event->v[1].size = size1;
 226
 227         spin_lock_irqsave(&client->lock, flags);
 228         if (client->in_shutdown)
 229                 kfree(event);
 230         else
 231                 list_add_tail(&event->link, &client->event_list);
 232         spin_unlock_irqrestore(&client->lock, flags);
 233
 234         wake_up_interruptible(&client->wait);
 235 }
 236
 237 static int dequeue_event(struct client *client,
 238                          char __user *buffer, size_t count)
 239 {
 240         struct event *event;
 241         size_t size, total;
 242         int i, ret;
 243
 244         ret = wait_event_interruptible(client->wait,
 245                         !list_empty(&client->event_list) ||
 246                         fw_device_is_shutdown(client->device));
 247         if (ret < 0)
 248                 return ret;
 249
 250         if (list_empty(&client->event_list) &&
 251                        fw_device_is_shutdown(client->device))
 252                 return -ENODEV;
 253
 254         spin_lock_irq(&client->lock);
 255         event = list_first_entry(&client->event_list, struct event, link);
 256         list_del(&event->link);
 257         spin_unlock_irq(&client->lock);
 258
 259         total = 0;
 260         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
 261                 size = min(event->v[i].size, count - total);
 262                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
 263                         ret = -EFAULT;
 264                         goto out;
 265                 }
 266                 total += size;
 267         }
 268         ret = total;
 269
 270  out:
 271         kfree(event);
 272
 273         return ret;
 274 }
 275
 276 static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
 277                                  size_t count, loff_t *offset)
 278 {
 279         struct client *client = file->private_data;
 280
 281         return dequeue_event(client, buffer, count);
 282 }
 283
 284 static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
 285                                  struct client *client)
 286 {
 287         struct fw_card *card = client->device->card;
 288
 289         spin_lock_irq(&card->lock);
 290
 291         event->closure       = client->bus_reset_closure;
 292         event->type          = FW_CDEV_EVENT_BUS_RESET;
 293         event->generation    = client->device->generation;
 294         event->node_id       = client->device->node_id;
 295         event->local_node_id = card->local_node->node_id;
 296         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
 297         event->irm_node_id   = card->irm_node->node_id;
 298         event->root_node_id  = card->root_node->node_id;
 299
 300         spin_unlock_irq(&card->lock);
 301 }
 302
 303 static void for_each_client(struct fw_device *device,
 304                             void (*callback)(struct client *client))
 305 {
 306         struct client *c;
 307
 308         mutex_lock(&device->client_list_mutex);
 309         list_for_each_entry(c, &device->client_list, link)
 310                 callback(c);
 311         mutex_unlock(&device->client_list_mutex);
 312 }
 313
 314 static int schedule_reallocations(int id, void *p, void *data)
 315 {
 316         struct client_resource *r = p;
 317
 318         if (r->release == release_iso_resource)
 319                 schedule_iso_resource(container_of(r,
 320                                         struct iso_resource, resource));
 321         return 0;
 322 }
 323
 324 static void queue_bus_reset_event(struct client *client)
 325 {
 326         struct bus_reset_event *e;
 327
 328         e = kzalloc(sizeof(*e), GFP_KERNEL);
 329         if (e == NULL) {
 330                 fw_notify("Out of memory when allocating bus reset event\n");
 331                 return;
 332         }
 333
 334         fill_bus_reset_event(&e->reset, client);
 335
 336         queue_event(client, &e->event,
 337                     &e->reset, sizeof(e->reset), NULL, 0);
 338
 339         spin_lock_irq(&client->lock);
 340         idr_for_each(&client->resource_idr, schedule_reallocations, client);
 341         spin_unlock_irq(&client->lock);
 342 }
 343
 344 void fw_device_cdev_update(struct fw_device *device)
 345 {
 346         for_each_client(device, queue_bus_reset_event);
 347 }
 348
 349 static void wake_up_client(struct client *client)
 350 {
 351         wake_up_interruptible(&client->wait);
 352 }
 353
 354 void fw_device_cdev_remove(struct fw_device *device)
 355 {
 356         for_each_client(device, wake_up_client);
 357 }
 358
 359 static int ioctl_get_info(struct client *client, void *buffer)
 360 {
 361         struct fw_cdev_get_info *get_info = buffer;
 362         struct fw_cdev_event_bus_reset bus_reset;
 363         unsigned long ret = 0;
 364
 365         client->version = get_info->version;
 366         get_info->version = FW_CDEV_VERSION;
 367         get_info->card = client->device->card->index;
 368
 369         down_read(&fw_device_rwsem);
 370
 371         if (get_info->rom != 0) {
 372                 void __user *uptr = u64_to_uptr(get_info->rom);
 373                 size_t want = get_info->rom_length;
 374                 size_t have = client->device->config_rom_length * 4;
 375
 376                 ret = copy_to_user(uptr, client->device->config_rom,
 377                                    min(want, have));
 378         }
 379         get_info->rom_length = client->device->config_rom_length * 4;
 380
 381         up_read(&fw_device_rwsem);
 382
 383         if (ret != 0)
 384                 return -EFAULT;
 385
 386         client->bus_reset_closure = get_info->bus_reset_closure;
 387         if (get_info->bus_reset != 0) {
 388                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
 389
 390                 fill_bus_reset_event(&bus_reset, client);
 391                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
 392                         return -EFAULT;
 393         }
 394
 395         return 0;
 396 }
 397
 398 static int add_client_resource(struct client *client,
 399                                struct client_resource *resource, gfp_t gfp_mask)
 400 {
 401         unsigned long flags;
 402         int ret;
 403
 404  retry:
 405         if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
 406                 return -ENOMEM;
 407
 408         spin_lock_irqsave(&client->lock, flags);
 409         if (client->in_shutdown)
 410                 ret = -ECANCELED;
 411         else
 412                 ret = idr_get_new(&client->resource_idr, resource,
 413                                   &resource->handle);
 414         if (ret >= 0) {
 415                 client_get(client);
 416                 if (resource->release == release_iso_resource)
 417                         schedule_iso_resource(container_of(resource,
 418                                                 struct iso_resource, resource));
 419         }
 420         spin_unlock_irqrestore(&client->lock, flags);
 421
 422         if (ret == -EAGAIN)
 423                 goto retry;
 424
 425         return ret < 0 ? ret : 0;
 426 }
 427
 428 static int release_client_resource(struct client *client, u32 handle,
 429                                    client_resource_release_fn_t release,
 430                                    struct client_resource **resource)
 431 {
 432         struct client_resource *r;
 433
 434         spin_lock_irq(&client->lock);
 435         if (client->in_shutdown)
 436                 r = NULL;
 437         else
 438                 r = idr_find(&client->resource_idr, handle);
 439         if (r && r->release == release)
 440                 idr_remove(&client->resource_idr, handle);
 441         spin_unlock_irq(&client->lock);
 442
 443         if (!(r && r->release == release))
 444                 return -EINVAL;
 445
 446         if (resource)
 447                 *resource = r;
 448         else
 449                 r->release(client, r);
 450
 451         client_put(client);
 452
 453         return 0;
 454 }
 455
 456 static void release_transaction(struct client *client,
 457                                 struct client_resource *resource)
 458 {
 459         struct outbound_transaction_resource *r = container_of(resource,
 460                         struct outbound_transaction_resource, resource);
 461
 462         fw_cancel_transaction(client->device->card, &r->transaction);
 463 }
 464
 465 static void complete_transaction(struct fw_card *card, int rcode,
 466                                  void *payload, size_t length, void *data)
 467 {
 468         struct outbound_transaction_event *e = data;
 469         struct fw_cdev_event_response *rsp = &e->response;
 470         struct client *client = e->client;
 471         unsigned long flags;
 472
 473         if (length < rsp->length)
 474                 rsp->length = length;
 475         if (rcode == RCODE_COMPLETE)
 476                 memcpy(rsp->data, payload, rsp->length);
 477
 478         spin_lock_irqsave(&client->lock, flags);
 479         /*
 480          * 1. If called while in shutdown, the idr tree must be left untouched.
 481          *    The idr handle will be removed and the client reference will be
 482          *    dropped later.
 483          * 2. If the call chain was release_client_resource ->
 484          *    release_transaction -> complete_transaction (instead of a normal
 485          *    conclusion of the transaction), i.e. if this resource was already
 486          *    unregistered from the idr, the client reference will be dropped
 487          *    by release_client_resource and we must not drop it here.
 488          */
 489         if (!client->in_shutdown &&
 490             idr_find(&client->resource_idr, e->r.resource.handle)) {
 491                 idr_remove(&client->resource_idr, e->r.resource.handle);
 492                 /* Drop the idr's reference */
 493                 client_put(client);
 494         }
 495         spin_unlock_irqrestore(&client->lock, flags);
 496
 497         rsp->type = FW_CDEV_EVENT_RESPONSE;
 498         rsp->rcode = rcode;
 499
 500         /*
 501          * In the case that sizeof(*rsp) doesn't align with the position of the
 502          * data, and the read is short, preserve an extra copy of the data
 503          * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
 504          * for short reads and some apps depended on it, this is both safe
 505          * and prudent for compatibility.
 506          */
 507         if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
 508                 queue_event(client, &e->event, rsp, sizeof(*rsp),
 509                             rsp->data, rsp->length);
 510         else
 511                 queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
 512                             NULL, 0);
 513
 514         /* Drop the transaction callback's reference */
 515         client_put(client);
 516 }
 517
 518 static int init_request(struct client *client,
 519                         struct fw_cdev_send_request *request,
 520                         int destination_id, int speed)
 521 {
 522         struct outbound_transaction_event *e;
 523         int ret;
 524
 525         if (request->tcode != TCODE_STREAM_DATA &&
 526             (request->length > 4096 || request->length > 512 << speed))
 527                 return -EIO;
 528
 529         e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
 530         if (e == NULL)
 531                 return -ENOMEM;
 532
 533         e->client = client;
 534         e->response.length = request->length;
 535         e->response.closure = request->closure;
 536
 537         if (request->data &&
 538             copy_from_user(e->response.data,
 539                            u64_to_uptr(request->data), request->length)) {
 540                 ret = -EFAULT;
 541                 goto failed;
 542         }
 543
 544         e->r.resource.release = release_transaction;
 545         ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
 546         if (ret < 0)
 547                 goto failed;
 548
 549         /* Get a reference for the transaction callback */
 550         client_get(client);
 551
 552         fw_send_request(client->device->card, &e->r.transaction,
 553                         request->tcode, destination_id, request->generation,
 554                         speed, request->offset, e->response.data,
 555                         request->length, complete_transaction, e);
 556         return 0;
 557
 558  failed:
 559         kfree(e);
 560
 561         return ret;
 562 }
 563
 564 static int ioctl_send_request(struct client *client, void *buffer)
 565 {
 566         struct fw_cdev_send_request *request = buffer;
 567
 568         switch (request->tcode) {
 569         case TCODE_WRITE_QUADLET_REQUEST:
 570         case TCODE_WRITE_BLOCK_REQUEST:
 571         case TCODE_READ_QUADLET_REQUEST:
 572         case TCODE_READ_BLOCK_REQUEST:
 573         case TCODE_LOCK_MASK_SWAP:
 574         case TCODE_LOCK_COMPARE_SWAP:
 575         case TCODE_LOCK_FETCH_ADD:
 576         case TCODE_LOCK_LITTLE_ADD:
 577         case TCODE_LOCK_BOUNDED_ADD:
 578         case TCODE_LOCK_WRAP_ADD:
 579         case TCODE_LOCK_VENDOR_DEPENDENT:
 580                 break;
 581         default:
 582                 return -EINVAL;
 583         }
 584
 585         return init_request(client, request, client->device->node_id,
 586                             client->device->max_speed);
 587 }
 588
 589 static void release_request(struct client *client,
 590                             struct client_resource *resource)
 591 {
 592         struct inbound_transaction_resource *r = container_of(resource,
 593                         struct inbound_transaction_resource, resource);
 594
 595         fw_send_response(client->device->card, r->request,
 596                          RCODE_CONFLICT_ERROR);
 597         kfree(r);
 598 }
 599
 600 static void handle_request(struct fw_card *card, struct fw_request *request,
 601                            int tcode, int destination, int source,
 602                            int generation, int speed,
 603                            unsigned long long offset,
 604                            void *payload, size_t length, void *callback_data)
 605 {
 606         struct address_handler_resource *handler = callback_data;
 607         struct inbound_transaction_resource *r;
 608         struct inbound_transaction_event *e;
 609         int ret;
 610
 611         r = kmalloc(sizeof(*r), GFP_ATOMIC);
 612         e = kmalloc(sizeof(*e), GFP_ATOMIC);
 613         if (r == NULL || e == NULL)
 614                 goto failed;
 615
 616         r->request = request;
 617         r->data    = payload;
 618         r->length  = length;
 619
 620         r->resource.release = release_request;
 621         ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
 622         if (ret < 0)
 623                 goto failed;
 624
 625         e->request.type    = FW_CDEV_EVENT_REQUEST;
 626         e->request.tcode   = tcode;
 627         e->request.offset  = offset;
 628         e->request.length  = length;
 629         e->request.handle  = r->resource.handle;
 630         e->request.closure = handler->closure;
 631
 632         queue_event(handler->client, &e->event,
 633                     &e->request, sizeof(e->request), payload, length);
 634         return;
 635
 636  failed:
 637         kfree(r);
 638         kfree(e);
 639         fw_send_response(card, request, RCODE_CONFLICT_ERROR);
 640 }
 641
 642 static void release_address_handler(struct client *client,
 643                                     struct client_resource *resource)
 644 {
 645         struct address_handler_resource *r =
 646             container_of(resource, struct address_handler_resource, resource);
 647
 648         fw_core_remove_address_handler(&r->handler);
 649         kfree(r);
 650 }
 651
 652 static int ioctl_allocate(struct client *client, void *buffer)
 653 {
 654         struct fw_cdev_allocate *request = buffer;
 655         struct address_handler_resource *r;
 656         struct fw_address_region region;
 657         int ret;
 658
 659         r = kmalloc(sizeof(*r), GFP_KERNEL);
 660         if (r == NULL)
 661                 return -ENOMEM;
 662
 663         region.start = request->offset;
 664         region.end = request->offset + request->length;
 665         r->handler.length = request->length;
 666         r->handler.address_callback = handle_request;
 667         r->handler.callback_data = r;
 668         r->closure = request->closure;
 669         r->client = client;
 670
 671         ret = fw_core_add_address_handler(&r->handler, &region);
 672         if (ret < 0) {
 673                 kfree(r);
 674                 return ret;
 675         }
 676
 677         r->resource.release = release_address_handler;
 678         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 679         if (ret < 0) {
 680                 release_address_handler(client, &r->resource);
 681                 return ret;
 682         }
 683         request->handle = r->resource.handle;
 684
 685         return 0;
 686 }
 687
 688 static int ioctl_deallocate(struct client *client, void *buffer)
 689 {
 690         struct fw_cdev_deallocate *request = buffer;
 691
 692         return release_client_resource(client, request->handle,
 693                                        release_address_handler, NULL);
 694 }
 695
 696 static int ioctl_send_response(struct client *client, void *buffer)
 697 {
 698         struct fw_cdev_send_response *request = buffer;
 699         struct client_resource *resource;
 700         struct inbound_transaction_resource *r;
 701
 702         if (release_client_resource(client, request->handle,
 703                                     release_request, &resource) < 0)
 704                 return -EINVAL;
 705
 706         r = container_of(resource, struct inbound_transaction_resource,
 707                          resource);
 708         if (request->length < r->length)
 709                 r->length = request->length;
 710         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
 711                 return -EFAULT;
 712
 713         fw_send_response(client->device->card, r->request, request->rcode);
 714         kfree(r);
 715
 716         return 0;
 717 }
 718
 719 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
 720 {
 721         struct fw_cdev_initiate_bus_reset *request = buffer;
 722         int short_reset;
 723
 724         short_reset = (request->type == FW_CDEV_SHORT_RESET);
 725
 726         return fw_core_initiate_bus_reset(client->device->card, short_reset);
 727 }
 728
 729 static void release_descriptor(struct client *client,
 730                                struct client_resource *resource)
 731 {
 732         struct descriptor_resource *r =
 733                 container_of(resource, struct descriptor_resource, resource);
 734
 735         fw_core_remove_descriptor(&r->descriptor);
 736         kfree(r);
 737 }
 738
 739 static int ioctl_add_descriptor(struct client *client, void *buffer)
 740 {
 741         struct fw_cdev_add_descriptor *request = buffer;
 742         struct fw_card *card = client->device->card;
 743         struct descriptor_resource *r;
 744         int ret;
 745
 746         /* Access policy: Allow this ioctl only on local nodes' device files. */
 747         spin_lock_irq(&card->lock);
 748         ret = client->device->node_id != card->local_node->node_id;
 749         spin_unlock_irq(&card->lock);
 750         if (ret)
 751                 return -ENOSYS;
 752
 753         if (request->length > 256)
 754                 return -EINVAL;
 755
 756         r = kmalloc(sizeof(*r) + request->length * 4, GFP_KERNEL);
 757         if (r == NULL)
 758                 return -ENOMEM;
 759
 760         if (copy_from_user(r->data,
 761                            u64_to_uptr(request->data), request->length * 4)) {
 762                 ret = -EFAULT;
 763                 goto failed;
 764         }
 765
 766         r->descriptor.length    = request->length;
 767         r->descriptor.immediate = request->immediate;
 768         r->descriptor.key       = request->key;
 769         r->descriptor.data      = r->data;
 770
 771         ret = fw_core_add_descriptor(&r->descriptor);
 772         if (ret < 0)
 773                 goto failed;
 774
 775         r->resource.release = release_descriptor;
 776         ret = add_client_resource(client, &r->resource, GFP_KERNEL);
 777         if (ret < 0) {
 778                 fw_core_remove_descriptor(&r->descriptor);
 779                 goto failed;
 780         }
 781         request->handle = r->resource.handle;
 782
 783         return 0;
 784  failed:
 785         kfree(r);
 786
 787         return ret;
 788 }
 789
 790 static int ioctl_remove_descriptor(struct client *client, void *buffer)
 791 {
 792         struct fw_cdev_remove_descriptor *request = buffer;
 793
 794         return release_client_resource(client, request->handle,
 795                                        release_descriptor, NULL);
 796 }
 797
 798 static void iso_callback(struct fw_iso_context *context, u32 cycle,
 799                          size_t header_length, void *header, void *data)
 800 {
 801         struct client *client = data;
 802         struct iso_interrupt_event *e;
 803
 804         e = kzalloc(sizeof(*e) + header_length, GFP_ATOMIC);
 805         if (e == NULL)
 806                 return;
 807
 808         e->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
 809         e->interrupt.closure   = client->iso_closure;
 810         e->interrupt.cycle     = cycle;
 811         e->interrupt.header_length = header_length;
 812         memcpy(e->interrupt.header, header, header_length);
 813         queue_event(client, &e->event, &e->interrupt,
 814                     sizeof(e->interrupt) + header_length, NULL, 0);
 815 }
 816
 817 static int ioctl_create_iso_context(struct client *client, void *buffer)
 818 {
 819         struct fw_cdev_create_iso_context *request = buffer;
 820         struct fw_iso_context *context;
 821
 822         /* We only support one context at this time. */
 823         if (client->iso_context != NULL)
 824                 return -EBUSY;
 825
 826         if (request->channel > 63)
 827                 return -EINVAL;
 828
 829         switch (request->type) {
 830         case FW_ISO_CONTEXT_RECEIVE:
 831                 if (request->header_size < 4 || (request->header_size & 3))
 832                         return -EINVAL;
 833
 834                 break;
 835
 836         case FW_ISO_CONTEXT_TRANSMIT:
 837                 if (request->speed > SCODE_3200)
 838                         return -EINVAL;
 839
 840                 break;
 841
 842         default:
 843                 return -EINVAL;
 844         }
 845
 846         context =  fw_iso_context_create(client->device->card,
 847                                          request->type,
 848                                          request->channel,
 849                                          request->speed,
 850                                          request->header_size,
 851                                          iso_callback, client);
 852         if (IS_ERR(context))
 853                 return PTR_ERR(context);
 854
 855         client->iso_closure = request->closure;
 856         client->iso_context = context;
 857
 858         /* We only support one context at this time. */
 859         request->handle = 0;
 860
 861         return 0;
 862 }
 863
 864 /* Macros for decoding the iso packet control header. */
 865 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
 866 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
 867 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
 868 #define GET_TAG(v)              (((v) >> 18) & 0x03)
 869 #define GET_SY(v)               (((v) >> 20) & 0x0f)
 870 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
 871
 872 static int ioctl_queue_iso(struct client *client, void *buffer)
 873 {
 874         struct fw_cdev_queue_iso *request = buffer;
 875         struct fw_cdev_iso_packet __user *p, *end, *next;
 876         struct fw_iso_context *ctx = client->iso_context;
 877         unsigned long payload, buffer_end, header_length;
 878         u32 control;
 879         int count;
 880         struct {
 881                 struct fw_iso_packet packet;
 882                 u8 header[256];
 883         } u;
 884
 885         if (ctx == NULL || request->handle != 0)
 886                 return -EINVAL;
 887
 888         /*
 889          * If the user passes a non-NULL data pointer, has mmap()'ed
 890          * the iso buffer, and the pointer points inside the buffer,
 891          * we setup the payload pointers accordingly.  Otherwise we
 892          * set them both to 0, which will still let packets with
 893          * payload_length == 0 through.  In other words, if no packets
 894          * use the indirect payload, the iso buffer need not be mapped
 895          * and the request->data pointer is ignored.
 896          */
 897
 898         payload = (unsigned long)request->data - client->vm_start;
 899         buffer_end = client->buffer.page_count << PAGE_SHIFT;
 900         if (request->data == 0 || client->buffer.pages == NULL ||
 901             payload >= buffer_end) {
 902                 payload = 0;
 903                 buffer_end = 0;
 904         }
 905
 906         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
 907
 908         if (!access_ok(VERIFY_READ, p, request->size))
 909                 return -EFAULT;
 910
 911         end = (void __user *)p + request->size;
 912         count = 0;
 913         while (p < end) {
 914                 if (get_user(control, &p->control))
 915                         return -EFAULT;
 916                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
 917                 u.packet.interrupt = GET_INTERRUPT(control);
 918                 u.packet.skip = GET_SKIP(control);
 919                 u.packet.tag = GET_TAG(control);
 920                 u.packet.sy = GET_SY(control);
 921                 u.packet.header_length = GET_HEADER_LENGTH(control);
 922
 923                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
 924                         header_length = u.packet.header_length;
 925                 } else {
 926                         /*
 927                          * We require that header_length is a multiple of
 928                          * the fixed header size, ctx->header_size.
 929                          */
 930                         if (ctx->header_size == 0) {
 931                                 if (u.packet.header_length > 0)
 932                                         return -EINVAL;
 933                         } else if (u.packet.header_length % ctx->header_size != 0) {
 934                                 return -EINVAL;
 935                         }
 936                         header_length = 0;
 937                 }
 938
 939                 next = (struct fw_cdev_iso_packet __user *)
 940                         &p->header[header_length / 4];
 941                 if (next > end)
 942                         return -EINVAL;
 943                 if (__copy_from_user
 944                     (u.packet.header, p->header, header_length))
 945                         return -EFAULT;
 946                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
 947                     u.packet.header_length + u.packet.payload_length > 0)
 948                         return -EINVAL;
 949                 if (payload + u.packet.payload_length > buffer_end)
 950                         return -EINVAL;
 951
 952                 if (fw_iso_context_queue(ctx, &u.packet,
 953                                          &client->buffer, payload))
 954                         break;
 955
 956                 p = next;
 957                 payload += u.packet.payload_length;
 958                 count++;
 959         }
 960
 961         request->size    -= uptr_to_u64(p) - request->packets;
 962         request->packets  = uptr_to_u64(p);
 963         request->data     = client->vm_start + payload;
 964
 965         return count;
 966 }
 967
 968 static int ioctl_start_iso(struct client *client, void *buffer)
 969 {
 970         struct fw_cdev_start_iso *request = buffer;
 971
 972         if (client->iso_context == NULL || request->handle != 0)
 973                 return -EINVAL;
 974
 975         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
 976                 if (request->tags == 0 || request->tags > 15)
 977                         return -EINVAL;
 978
 979                 if (request->sync > 15)
 980                         return -EINVAL;
 981         }
 982
 983         return fw_iso_context_start(client->iso_context, request->cycle,
 984                                     request->sync, request->tags);
 985 }
 986
 987 static int ioctl_stop_iso(struct client *client, void *buffer)
 988 {
 989         struct fw_cdev_stop_iso *request = buffer;
 990
 991         if (client->iso_context == NULL || request->handle != 0)
 992                 return -EINVAL;
 993
 994         return fw_iso_context_stop(client->iso_context);
 995 }
 996
 997 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
 998 {
 999         struct fw_cdev_get_cycle_timer *request = buffer;
1000         struct fw_card *card = client->device->card;
1001         unsigned long long bus_time;
1002         struct timeval tv;
1003         unsigned long flags;
1004
1005         preempt_disable();
1006         local_irq_save(flags);
1007
1008         bus_time = card->driver->get_bus_time(card);
1009         do_gettimeofday(&tv);
1010
1011         local_irq_restore(flags);
1012         preempt_enable();
1013
1014         request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
1015         request->cycle_timer = bus_time & 0xffffffff;
1016         return 0;
1017 }
1018
1019 static void iso_resource_work(struct work_struct *work)
1020 {
1021         struct iso_resource_event *e;
1022         struct iso_resource *r =
1023                         container_of(work, struct iso_resource, work.work);
1024         struct client *client = r->client;
1025         int generation, channel, bandwidth, todo;
1026         bool skip, free, success;
1027
1028         spin_lock_irq(&client->lock);
1029         generation = client->device->generation;
1030         todo = r->todo;
1031         /* Allow 1000ms grace period for other reallocations. */
1032         if (todo == ISO_RES_ALLOC &&
1033             time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
1034                 if (schedule_delayed_work(&r->work, DIV_ROUND_UP(HZ, 3)))
1035                         client_get(client);
1036                 skip = true;
1037         } else {
1038                 /* We could be called twice within the same generation. */
1039                 skip = todo == ISO_RES_REALLOC &&
1040                        r->generation == generation;
1041         }
1042         free = todo == ISO_RES_DEALLOC ||
1043                todo == ISO_RES_ALLOC_ONCE ||
1044                todo == ISO_RES_DEALLOC_ONCE;
1045         r->generation = generation;
1046         spin_unlock_irq(&client->lock);
1047
1048         if (skip)
1049                 goto out;
1050
1051         bandwidth = r->bandwidth;
1052
1053         fw_iso_resource_manage(client->device->card, generation,
1054                         r->channels, &channel, &bandwidth,
1055                         todo == ISO_RES_ALLOC ||
1056                         todo == ISO_RES_REALLOC ||
1057                         todo == ISO_RES_ALLOC_ONCE);
1058         /*
1059          * Is this generation outdated already?  As long as this resource sticks
1060          * in the idr, it will be scheduled again for a newer generation or at
1061          * shutdown.
1062          */
1063         if (channel == -EAGAIN &&
1064             (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
1065                 goto out;
1066
1067         success = channel >= 0 || bandwidth > 0;
1068
1069         spin_lock_irq(&client->lock);
1070         /*
1071          * Transit from allocation to reallocation, except if the client
1072          * requested deallocation in the meantime.
1073          */
1074         if (r->todo == ISO_RES_ALLOC)
1075                 r->todo = ISO_RES_REALLOC;
1076         /*
1077          * Allocation or reallocation failure?  Pull this resource out of the
1078          * idr and prepare for deletion, unless the client is shutting down.
1079          */
1080         if (r->todo == ISO_RES_REALLOC && !success &&
1081             !client->in_shutdown &&
1082             idr_find(&client->resource_idr, r->resource.handle)) {
1083                 idr_remove(&client->resource_idr, r->resource.handle);
1084                 client_put(client);
1085                 free = true;
1086         }
1087         spin_unlock_irq(&client->lock);
1088
1089         if (todo == ISO_RES_ALLOC && channel >= 0)
1090                 r->channels = 1ULL << channel;
1091
1092         if (todo == ISO_RES_REALLOC && success)
1093                 goto out;
1094
1095         if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
1096                 e = r->e_alloc;
1097                 r->e_alloc = NULL;
1098         } else {
1099                 e = r->e_dealloc;
1100                 r->e_dealloc = NULL;
1101         }
1102         e->resource.handle      = r->resource.handle;
1103         e->resource.channel     = channel;
1104         e->resource.bandwidth   = bandwidth;
1105
1106         queue_event(client, &e->event,
1107                     &e->resource, sizeof(e->resource), NULL, 0);
1108
1109         if (free) {
1110                 cancel_delayed_work(&r->work);
1111                 kfree(r->e_alloc);
1112                 kfree(r->e_dealloc);
1113                 kfree(r);
1114         }
1115  out:
1116         client_put(client);
1117 }
1118
1119 static void schedule_iso_resource(struct iso_resource *r)
1120 {
1121         client_get(r->client);
1122         if (!schedule_delayed_work(&r->work, 0))
1123                 client_put(r->client);
1124 }
1125
1126 static void release_iso_resource(struct client *client,
1127                                  struct client_resource *resource)
1128 {
1129         struct iso_resource *r =
1130                 container_of(resource, struct iso_resource, resource);
1131
1132         spin_lock_irq(&client->lock);
1133         r->todo = ISO_RES_DEALLOC;
1134         schedule_iso_resource(r);
1135         spin_unlock_irq(&client->lock);
1136 }
1137
1138 static int init_iso_resource(struct client *client,
1139                 struct fw_cdev_allocate_iso_resource *request, int todo)
1140 {
1141         struct iso_resource_event *e1, *e2;
1142         struct iso_resource *r;
1143         int ret;
1144
1145         if ((request->channels == 0 && request->bandwidth == 0) ||
1146             request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL ||
1147             request->bandwidth < 0)
1148                 return -EINVAL;
1149
1150         r  = kmalloc(sizeof(*r), GFP_KERNEL);
1151         e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
1152         e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
1153         if (r == NULL || e1 == NULL || e2 == NULL) {
1154                 ret = -ENOMEM;
1155                 goto fail;
1156         }
1157
1158         INIT_DELAYED_WORK(&r->work, iso_resource_work);
1159         r->client       = client;
1160         r->todo         = todo;
1161         r->generation   = -1;
1162         r->channels     = request->channels;
1163         r->bandwidth    = request->bandwidth;
1164         r->e_alloc      = e1;
1165         r->e_dealloc    = e2;
1166
1167         e1->resource.closure    = request->closure;
1168         e1->resource.type       = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
1169         e2->resource.closure    = request->closure;
1170         e2->resource.type       = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
1171
1172         if (todo == ISO_RES_ALLOC) {
1173                 r->resource.release = release_iso_resource;
1174                 ret = add_client_resource(client, &r->resource, GFP_KERNEL);
1175                 if (ret < 0)
1176                         goto fail;
1177         } else {
1178                 r->resource.release = NULL;
1179                 r->resource.handle = -1;
1180                 schedule_iso_resource(r);
1181         }
1182         request->handle = r->resource.handle;
1183
1184         return 0;
1185  fail:
1186         kfree(r);
1187         kfree(e1);
1188         kfree(e2);
1189
1190         return ret;
1191 }
1192
1193 static int ioctl_allocate_iso_resource(struct client *client, void *buffer)
1194 {
1195         struct fw_cdev_allocate_iso_resource *request = buffer;
1196
1197         return init_iso_resource(client, request, ISO_RES_ALLOC);
1198 }
1199
1200 static int ioctl_deallocate_iso_resource(struct client *client, void *buffer)
1201 {
1202         struct fw_cdev_deallocate *request = buffer;
1203
1204         return release_client_resource(client, request->handle,
1205                                        release_iso_resource, NULL);
1206 }
1207
1208 static int ioctl_allocate_iso_resource_once(struct client *client, void *buffer)
1209 {
1210         struct fw_cdev_allocate_iso_resource *request = buffer;
1211
1212         return init_iso_resource(client, request, ISO_RES_ALLOC_ONCE);
1213 }
1214
1215 static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffer)
1216 {
1217         struct fw_cdev_allocate_iso_resource *request = buffer;
1218
1219         return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE);
1220 }
1221
1222 /*
1223  * Returns a speed code:  Maximum speed to or from this device,
1224  * limited by the device's link speed, the local node's link speed,
1225  * and all PHY port speeds between the two links.
1226  */
1227 static int ioctl_get_speed(struct client *client, void *buffer)
1228 {
1229         return client->device->max_speed;
1230 }
1231
1232 static int ioctl_send_broadcast_request(struct client *client, void *buffer)
1233 {
1234         struct fw_cdev_send_request *request = buffer;
1235
1236         switch (request->tcode) {
1237         case TCODE_WRITE_QUADLET_REQUEST:
1238         case TCODE_WRITE_BLOCK_REQUEST:
1239                 break;
1240         default:
1241                 return -EINVAL;
1242         }
1243
1244         /* Security policy: Only allow accesses to Units Space. */
1245         if (request->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
1246                 return -EACCES;
1247
1248         return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100);
1249 }
1250
1251 static int ioctl_send_stream_packet(struct client *client, void *buffer)
1252 {
1253         struct fw_cdev_send_stream_packet *p = buffer;
1254         struct fw_cdev_send_request request;
1255         int dest;
1256
1257         if (p->speed > client->device->card->link_speed ||
1258             p->length > 1024 << p->speed)
1259                 return -EIO;
1260
1261         if (p->tag > 3 || p->channel > 63 || p->sy > 15)
1262                 return -EINVAL;
1263
1264         dest = fw_stream_packet_destination_id(p->tag, p->channel, p->sy);
1265         request.tcode           = TCODE_STREAM_DATA;
1266         request.length          = p->length;
1267         request.closure         = p->closure;
1268         request.data            = p->data;
1269         request.generation      = p->generation;
1270
1271         return init_request(client, &request, dest, p->speed);
1272 }
1273
1274 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
1275         ioctl_get_info,
1276         ioctl_send_request,
1277         ioctl_allocate,
1278         ioctl_deallocate,
1279         ioctl_send_response,
1280         ioctl_initiate_bus_reset,
1281         ioctl_add_descriptor,
1282         ioctl_remove_descriptor,
1283         ioctl_create_iso_context,
1284         ioctl_queue_iso,
1285         ioctl_start_iso,
1286         ioctl_stop_iso,
1287         ioctl_get_cycle_timer,
1288         ioctl_allocate_iso_resource,
1289         ioctl_deallocate_iso_resource,
1290         ioctl_allocate_iso_resource_once,
1291         ioctl_deallocate_iso_resource_once,
1292         ioctl_get_speed,
1293         ioctl_send_broadcast_request,
1294         ioctl_send_stream_packet,
1295 };
1296
1297 static int dispatch_ioctl(struct client *client,
1298                           unsigned int cmd, void __user *arg)
1299 {
1300         char buffer[256];
1301         int ret;
1302
1303         if (_IOC_TYPE(cmd) != '#' ||
1304             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
1305                 return -EINVAL;
1306
1307         if (_IOC_DIR(cmd) & _IOC_WRITE) {
1308                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1309                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
1310                         return -EFAULT;
1311         }
1312
1313         ret = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
1314         if (ret < 0)
1315                 return ret;
1316
1317         if (_IOC_DIR(cmd) & _IOC_READ) {
1318                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
1319                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
1320                         return -EFAULT;
1321         }
1322
1323         return ret;
1324 }
1325
1326 static long fw_device_op_ioctl(struct file *file,
1327                                unsigned int cmd, unsigned long arg)
1328 {
1329         struct client *client = file->private_data;
1330
1331         if (fw_device_is_shutdown(client->device))
1332                 return -ENODEV;
1333
1334         return dispatch_ioctl(client, cmd, (void __user *) arg);
1335 }
1336
1337 #ifdef CONFIG_COMPAT
1338 static long fw_device_op_compat_ioctl(struct file *file,
1339                                       unsigned int cmd, unsigned long arg)
1340 {
1341         struct client *client = file->private_data;
1342
1343         if (fw_device_is_shutdown(client->device))
1344                 return -ENODEV;
1345
1346         return dispatch_ioctl(client, cmd, compat_ptr(arg));
1347 }
1348 #endif
1349
1350 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
1351 {
1352         struct client *client = file->private_data;
1353         enum dma_data_direction direction;
1354         unsigned long size;
1355         int page_count, ret;
1356
1357         if (fw_device_is_shutdown(client->device))
1358                 return -ENODEV;
1359
1360         /* FIXME: We could support multiple buffers, but we don't. */
1361         if (client->buffer.pages != NULL)
1362                 return -EBUSY;
1363
1364         if (!(vma->vm_flags & VM_SHARED))
1365                 return -EINVAL;
1366
1367         if (vma->vm_start & ~PAGE_MASK)
1368                 return -EINVAL;
1369
1370         client->vm_start = vma->vm_start;
1371         size = vma->vm_end - vma->vm_start;
1372         page_count = size >> PAGE_SHIFT;
1373         if (size & ~PAGE_MASK)
1374                 return -EINVAL;
1375
1376         if (vma->vm_flags & VM_WRITE)
1377                 direction = DMA_TO_DEVICE;
1378         else
1379                 direction = DMA_FROM_DEVICE;
1380
1381         ret = fw_iso_buffer_init(&client->buffer, client->device->card,
1382                                  page_count, direction);
1383         if (ret < 0)
1384                 return ret;
1385
1386         ret = fw_iso_buffer_map(&client->buffer, vma);
1387         if (ret < 0)
1388                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1389
1390         return ret;
1391 }
1392
1393 static int shutdown_resource(int id, void *p, void *data)
1394 {
1395         struct client_resource *r = p;
1396         struct client *client = data;
1397
1398         r->release(client, r);
1399         client_put(client);
1400
1401         return 0;
1402 }
1403
1404 static int fw_device_op_release(struct inode *inode, struct file *file)
1405 {
1406         struct client *client = file->private_data;
1407         struct event *e, *next_e;
1408
1409         mutex_lock(&client->device->client_list_mutex);
1410         list_del(&client->link);
1411         mutex_unlock(&client->device->client_list_mutex);
1412
1413         if (client->iso_context)
1414                 fw_iso_context_destroy(client->iso_context);
1415
1416         if (client->buffer.pages)
1417                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
1418
1419         /* Freeze client->resource_idr and client->event_list */
1420         spin_lock_irq(&client->lock);
1421         client->in_shutdown = true;
1422         spin_unlock_irq(&client->lock);
1423
1424         idr_for_each(&client->resource_idr, shutdown_resource, client);
1425         idr_remove_all(&client->resource_idr);
1426         idr_destroy(&client->resource_idr);
1427
1428         list_for_each_entry_safe(e, next_e, &client->event_list, link)
1429                 kfree(e);
1430
1431         client_put(client);
1432
1433         return 0;
1434 }
1435
1436 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
1437 {
1438         struct client *client = file->private_data;
1439         unsigned int mask = 0;
1440
1441         poll_wait(file, &client->wait, pt);
1442
1443         if (fw_device_is_shutdown(client->device))
1444                 mask |= POLLHUP | POLLERR;
1445         if (!list_empty(&client->event_list))
1446                 mask |= POLLIN | POLLRDNORM;
1447
1448         return mask;
1449 }
1450
1451 const struct file_operations fw_device_ops = {
1452         .owner          = THIS_MODULE,
1453         .open           = fw_device_op_open,
1454         .read           = fw_device_op_read,
1455         .unlocked_ioctl = fw_device_op_ioctl,
1456         .poll           = fw_device_op_poll,
1457         .release        = fw_device_op_release,
1458         .mmap           = fw_device_op_mmap,
1459
1460 #ifdef CONFIG_COMPAT
1461         .compat_ioctl   = fw_device_op_compat_ioctl,
1462 #endif
1463 };