drivers/media/dvb-core/dmxdev.c

   1 /*
   2  * dmxdev.c - DVB demultiplexer device
   3  *
   4  * Copyright (C) 2000 Ralph Metzler & Marcus Metzler
   5  *                    for convergence integrated media GmbH
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public License
   9  * as published by the Free Software Foundation; either version 2.1
  10  * of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  */
  18
  19 #define pr_fmt(fmt) "dmxdev: " fmt
  20
  21 #include <linux/sched.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/slab.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/module.h>
  26 #include <linux/poll.h>
  27 #include <linux/ioctl.h>
  28 #include <linux/wait.h>
  29 #include <linux/uaccess.h>
  30 #include "dmxdev.h"
  31
  32 static int debug;
  33
  34 module_param(debug, int, 0644);
  35 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  36
  37 #define dprintk(fmt, arg...) do {                                       \
  38         if (debug)                                                      \
  39                 printk(KERN_DEBUG pr_fmt("%s: " fmt),                   \
  40                         __func__, ##arg);                               \
  41 } while (0)
  42
  43 static int dvb_dmxdev_buffer_write(struct dvb_ringbuffer *buf,
  44                                    const u8 *src, size_t len)
  45 {
  46         ssize_t free;
  47
  48         if (!len)
  49                 return 0;
  50         if (!buf->data)
  51                 return 0;
  52
  53         free = dvb_ringbuffer_free(buf);
  54         if (len > free) {
  55                 dprintk("buffer overflow\n");
  56                 return -EOVERFLOW;
  57         }
  58
  59         return dvb_ringbuffer_write(buf, src, len);
  60 }
  61
  62 static ssize_t dvb_dmxdev_buffer_read(struct dvb_ringbuffer *src,
  63                                       int non_blocking, char __user *buf,
  64                                       size_t count, loff_t *ppos)
  65 {
  66         size_t todo;
  67         ssize_t avail;
  68         ssize_t ret = 0;
  69
  70         if (!src->data)
  71                 return 0;
  72
  73         if (src->error) {
  74                 ret = src->error;
  75                 dvb_ringbuffer_flush(src);
  76                 return ret;
  77         }
  78
  79         for (todo = count; todo > 0; todo -= ret) {
  80                 if (non_blocking && dvb_ringbuffer_empty(src)) {
  81                         ret = -EWOULDBLOCK;
  82                         break;
  83                 }
  84
  85                 ret = wait_event_interruptible(src->queue,
  86                                                !dvb_ringbuffer_empty(src) ||
  87                                                (src->error != 0));
  88                 if (ret < 0)
  89                         break;
  90
  91                 if (src->error) {
  92                         ret = src->error;
  93                         dvb_ringbuffer_flush(src);
  94                         break;
  95                 }
  96
  97                 avail = dvb_ringbuffer_avail(src);
  98                 if (avail > todo)
  99                         avail = todo;
 100
 101                 ret = dvb_ringbuffer_read_user(src, buf, avail);
 102                 if (ret < 0)
 103                         break;
 104
 105                 buf += ret;
 106         }
 107
 108         return (count - todo) ? (count - todo) : ret;
 109 }
 110
 111 static struct dmx_frontend *get_fe(struct dmx_demux *demux, int type)
 112 {
 113         struct list_head *head, *pos;
 114
 115         head = demux->get_frontends(demux);
 116         if (!head)
 117                 return NULL;
 118         list_for_each(pos, head)
 119                 if (DMX_FE_ENTRY(pos)->source == type)
 120                         return DMX_FE_ENTRY(pos);
 121
 122         return NULL;
 123 }
 124
 125 static int dvb_dvr_open(struct inode *inode, struct file *file)
 126 {
 127         struct dvb_device *dvbdev = file->private_data;
 128         struct dmxdev *dmxdev = dvbdev->priv;
 129         struct dmx_frontend *front;
 130
 131         dprintk("%s\n", __func__);
 132
 133         if (mutex_lock_interruptible(&dmxdev->mutex))
 134                 return -ERESTARTSYS;
 135
 136         if (dmxdev->exit) {
 137                 mutex_unlock(&dmxdev->mutex);
 138                 return -ENODEV;
 139         }
 140
 141         if ((file->f_flags & O_ACCMODE) == O_RDWR) {
 142                 if (!(dmxdev->capabilities & DMXDEV_CAP_DUPLEX)) {
 143                         mutex_unlock(&dmxdev->mutex);
 144                         return -EOPNOTSUPP;
 145                 }
 146         }
 147
 148         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 149                 void *mem;
 150
 151                 if (!dvbdev->readers) {
 152                         mutex_unlock(&dmxdev->mutex);
 153                         return -EBUSY;
 154                 }
 155                 mem = vmalloc(DVR_BUFFER_SIZE);
 156                 if (!mem) {
 157                         mutex_unlock(&dmxdev->mutex);
 158                         return -ENOMEM;
 159                 }
 160                 dvb_ringbuffer_init(&dmxdev->dvr_buffer, mem, DVR_BUFFER_SIZE);
 161                 dvbdev->readers--;
 162         }
 163
 164         if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
 165                 dmxdev->dvr_orig_fe = dmxdev->demux->frontend;
 166
 167                 if (!dmxdev->demux->write) {
 168                         mutex_unlock(&dmxdev->mutex);
 169                         return -EOPNOTSUPP;
 170                 }
 171
 172                 front = get_fe(dmxdev->demux, DMX_MEMORY_FE);
 173
 174                 if (!front) {
 175                         mutex_unlock(&dmxdev->mutex);
 176                         return -EINVAL;
 177                 }
 178                 dmxdev->demux->disconnect_frontend(dmxdev->demux);
 179                 dmxdev->demux->connect_frontend(dmxdev->demux, front);
 180         }
 181         dvbdev->users++;
 182         mutex_unlock(&dmxdev->mutex);
 183         return 0;
 184 }
 185
 186 static int dvb_dvr_release(struct inode *inode, struct file *file)
 187 {
 188         struct dvb_device *dvbdev = file->private_data;
 189         struct dmxdev *dmxdev = dvbdev->priv;
 190
 191         mutex_lock(&dmxdev->mutex);
 192
 193         if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
 194                 dmxdev->demux->disconnect_frontend(dmxdev->demux);
 195                 dmxdev->demux->connect_frontend(dmxdev->demux,
 196                                                 dmxdev->dvr_orig_fe);
 197         }
 198         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
 199                 dvbdev->readers++;
 200                 if (dmxdev->dvr_buffer.data) {
 201                         void *mem = dmxdev->dvr_buffer.data;
 202                         /*memory barrier*/
 203                         mb();
 204                         spin_lock_irq(&dmxdev->lock);
 205                         dmxdev->dvr_buffer.data = NULL;
 206                         spin_unlock_irq(&dmxdev->lock);
 207                         vfree(mem);
 208                 }
 209         }
 210         /* TODO */
 211         dvbdev->users--;
 212         if (dvbdev->users == 1 && dmxdev->exit == 1) {
 213                 mutex_unlock(&dmxdev->mutex);
 214                 wake_up(&dvbdev->wait_queue);
 215         } else
 216                 mutex_unlock(&dmxdev->mutex);
 217
 218         return 0;
 219 }
 220
 221 static ssize_t dvb_dvr_write(struct file *file, const char __user *buf,
 222                              size_t count, loff_t *ppos)
 223 {
 224         struct dvb_device *dvbdev = file->private_data;
 225         struct dmxdev *dmxdev = dvbdev->priv;
 226         int ret;
 227
 228         if (!dmxdev->demux->write)
 229                 return -EOPNOTSUPP;
 230         if ((file->f_flags & O_ACCMODE) != O_WRONLY)
 231                 return -EINVAL;
 232         if (mutex_lock_interruptible(&dmxdev->mutex))
 233                 return -ERESTARTSYS;
 234
 235         if (dmxdev->exit) {
 236                 mutex_unlock(&dmxdev->mutex);
 237                 return -ENODEV;
 238         }
 239         ret = dmxdev->demux->write(dmxdev->demux, buf, count);
 240         mutex_unlock(&dmxdev->mutex);
 241         return ret;
 242 }
 243
 244 static ssize_t dvb_dvr_read(struct file *file, char __user *buf, size_t count,
 245                             loff_t *ppos)
 246 {
 247         struct dvb_device *dvbdev = file->private_data;
 248         struct dmxdev *dmxdev = dvbdev->priv;
 249
 250         if (dmxdev->exit)
 251                 return -ENODEV;
 252
 253         return dvb_dmxdev_buffer_read(&dmxdev->dvr_buffer,
 254                                       file->f_flags & O_NONBLOCK,
 255                                       buf, count, ppos);
 256 }
 257
 258 static int dvb_dvr_set_buffer_size(struct dmxdev *dmxdev,
 259                                       unsigned long size)
 260 {
 261         struct dvb_ringbuffer *buf = &dmxdev->dvr_buffer;
 262         void *newmem;
 263         void *oldmem;
 264
 265         dprintk("%s\n", __func__);
 266
 267         if (buf->size == size)
 268                 return 0;
 269         if (!size)
 270                 return -EINVAL;
 271
 272         newmem = vmalloc(size);
 273         if (!newmem)
 274                 return -ENOMEM;
 275
 276         oldmem = buf->data;
 277
 278         spin_lock_irq(&dmxdev->lock);
 279         buf->data = newmem;
 280         buf->size = size;
 281
 282         /* reset and not flush in case the buffer shrinks */
 283         dvb_ringbuffer_reset(buf);
 284         spin_unlock_irq(&dmxdev->lock);
 285
 286         vfree(oldmem);
 287
 288         return 0;
 289 }
 290
 291 static inline void dvb_dmxdev_filter_state_set(struct dmxdev_filter
 292                                                *dmxdevfilter, int state)
 293 {
 294         spin_lock_irq(&dmxdevfilter->dev->lock);
 295         dmxdevfilter->state = state;
 296         spin_unlock_irq(&dmxdevfilter->dev->lock);
 297 }
 298
 299 static int dvb_dmxdev_set_buffer_size(struct dmxdev_filter *dmxdevfilter,
 300                                       unsigned long size)
 301 {
 302         struct dvb_ringbuffer *buf = &dmxdevfilter->buffer;
 303         void *newmem;
 304         void *oldmem;
 305
 306         if (buf->size == size)
 307                 return 0;
 308         if (!size)
 309                 return -EINVAL;
 310         if (dmxdevfilter->state >= DMXDEV_STATE_GO)
 311                 return -EBUSY;
 312
 313         newmem = vmalloc(size);
 314         if (!newmem)
 315                 return -ENOMEM;
 316
 317         oldmem = buf->data;
 318
 319         spin_lock_irq(&dmxdevfilter->dev->lock);
 320         buf->data = newmem;
 321         buf->size = size;
 322
 323         /* reset and not flush in case the buffer shrinks */
 324         dvb_ringbuffer_reset(buf);
 325         spin_unlock_irq(&dmxdevfilter->dev->lock);
 326
 327         vfree(oldmem);
 328
 329         return 0;
 330 }
 331
 332 static void dvb_dmxdev_filter_timeout(unsigned long data)
 333 {
 334         struct dmxdev_filter *dmxdevfilter = (struct dmxdev_filter *)data;
 335
 336         dmxdevfilter->buffer.error = -ETIMEDOUT;
 337         spin_lock_irq(&dmxdevfilter->dev->lock);
 338         dmxdevfilter->state = DMXDEV_STATE_TIMEDOUT;
 339         spin_unlock_irq(&dmxdevfilter->dev->lock);
 340         wake_up(&dmxdevfilter->buffer.queue);
 341 }
 342
 343 static void dvb_dmxdev_filter_timer(struct dmxdev_filter *dmxdevfilter)
 344 {
 345         struct dmx_sct_filter_params *para = &dmxdevfilter->params.sec;
 346
 347         del_timer(&dmxdevfilter->timer);
 348         if (para->timeout) {
 349                 dmxdevfilter->timer.function = dvb_dmxdev_filter_timeout;
 350                 dmxdevfilter->timer.data = (unsigned long)dmxdevfilter;
 351                 dmxdevfilter->timer.expires =
 352                     jiffies + 1 + (HZ / 2 + HZ * para->timeout) / 1000;
 353                 add_timer(&dmxdevfilter->timer);
 354         }
 355 }
 356
 357 static int dvb_dmxdev_section_callback(const u8 *buffer1, size_t buffer1_len,
 358                                        const u8 *buffer2, size_t buffer2_len,
 359                                        struct dmx_section_filter *filter)
 360 {
 361         struct dmxdev_filter *dmxdevfilter = filter->priv;
 362         int ret;
 363
 364         if (dmxdevfilter->buffer.error) {
 365                 wake_up(&dmxdevfilter->buffer.queue);
 366                 return 0;
 367         }
 368         spin_lock(&dmxdevfilter->dev->lock);
 369         if (dmxdevfilter->state != DMXDEV_STATE_GO) {
 370                 spin_unlock(&dmxdevfilter->dev->lock);
 371                 return 0;
 372         }
 373         del_timer(&dmxdevfilter->timer);
 374         dprintk("section callback %*ph\n", 6, buffer1);
 375         ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer, buffer1,
 376                                       buffer1_len);
 377         if (ret == buffer1_len) {
 378                 ret = dvb_dmxdev_buffer_write(&dmxdevfilter->buffer, buffer2,
 379                                               buffer2_len);
 380         }
 381         if (ret < 0)
 382                 dmxdevfilter->buffer.error = ret;
 383         if (dmxdevfilter->params.sec.flags & DMX_ONESHOT)
 384                 dmxdevfilter->state = DMXDEV_STATE_DONE;
 385         spin_unlock(&dmxdevfilter->dev->lock);
 386         wake_up(&dmxdevfilter->buffer.queue);
 387         return 0;
 388 }
 389
 390 static int dvb_dmxdev_ts_callback(const u8 *buffer1, size_t buffer1_len,
 391                                   const u8 *buffer2, size_t buffer2_len,
 392                                   struct dmx_ts_feed *feed)
 393 {
 394         struct dmxdev_filter *dmxdevfilter = feed->priv;
 395         struct dvb_ringbuffer *buffer;
 396         int ret;
 397
 398         spin_lock(&dmxdevfilter->dev->lock);
 399         if (dmxdevfilter->params.pes.output == DMX_OUT_DECODER) {
 400                 spin_unlock(&dmxdevfilter->dev->lock);
 401                 return 0;
 402         }
 403
 404         if (dmxdevfilter->params.pes.output == DMX_OUT_TAP
 405             || dmxdevfilter->params.pes.output == DMX_OUT_TSDEMUX_TAP)
 406                 buffer = &dmxdevfilter->buffer;
 407         else
 408                 buffer = &dmxdevfilter->dev->dvr_buffer;
 409         if (buffer->error) {
 410                 spin_unlock(&dmxdevfilter->dev->lock);
 411                 wake_up(&buffer->queue);
 412                 return 0;
 413         }
 414         ret = dvb_dmxdev_buffer_write(buffer, buffer1, buffer1_len);
 415         if (ret == buffer1_len)
 416                 ret = dvb_dmxdev_buffer_write(buffer, buffer2, buffer2_len);
 417         if (ret < 0)
 418                 buffer->error = ret;
 419         spin_unlock(&dmxdevfilter->dev->lock);
 420         wake_up(&buffer->queue);
 421         return 0;
 422 }
 423
 424 /* stop feed but only mark the specified filter as stopped (state set) */
 425 static int dvb_dmxdev_feed_stop(struct dmxdev_filter *dmxdevfilter)
 426 {
 427         struct dmxdev_feed *feed;
 428
 429         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 430
 431         switch (dmxdevfilter->type) {
 432         case DMXDEV_TYPE_SEC:
 433                 del_timer(&dmxdevfilter->timer);
 434                 dmxdevfilter->feed.sec->stop_filtering(dmxdevfilter->feed.sec);
 435                 break;
 436         case DMXDEV_TYPE_PES:
 437                 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next)
 438                         feed->ts->stop_filtering(feed->ts);
 439                 break;
 440         default:
 441                 return -EINVAL;
 442         }
 443         return 0;
 444 }
 445
 446 /* start feed associated with the specified filter */
 447 static int dvb_dmxdev_feed_start(struct dmxdev_filter *filter)
 448 {
 449         struct dmxdev_feed *feed;
 450         int ret;
 451
 452         dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
 453
 454         switch (filter->type) {
 455         case DMXDEV_TYPE_SEC:
 456                 return filter->feed.sec->start_filtering(filter->feed.sec);
 457         case DMXDEV_TYPE_PES:
 458                 list_for_each_entry(feed, &filter->feed.ts, next) {
 459                         ret = feed->ts->start_filtering(feed->ts);
 460                         if (ret < 0) {
 461                                 dvb_dmxdev_feed_stop(filter);
 462                                 return ret;
 463                         }
 464                 }
 465                 break;
 466         default:
 467                 return -EINVAL;
 468         }
 469
 470         return 0;
 471 }
 472
 473 /* restart section feed if it has filters left associated with it,
 474    otherwise release the feed */
 475 static int dvb_dmxdev_feed_restart(struct dmxdev_filter *filter)
 476 {
 477         int i;
 478         struct dmxdev *dmxdev = filter->dev;
 479         u16 pid = filter->params.sec.pid;
 480
 481         for (i = 0; i < dmxdev->filternum; i++)
 482                 if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
 483                     dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
 484                     dmxdev->filter[i].params.sec.pid == pid) {
 485                         dvb_dmxdev_feed_start(&dmxdev->filter[i]);
 486                         return 0;
 487                 }
 488
 489         filter->dev->demux->release_section_feed(dmxdev->demux,
 490                                                  filter->feed.sec);
 491
 492         return 0;
 493 }
 494
 495 static int dvb_dmxdev_filter_stop(struct dmxdev_filter *dmxdevfilter)
 496 {
 497         struct dmxdev_feed *feed;
 498         struct dmx_demux *demux;
 499
 500         if (dmxdevfilter->state < DMXDEV_STATE_GO)
 501                 return 0;
 502
 503         switch (dmxdevfilter->type) {
 504         case DMXDEV_TYPE_SEC:
 505                 if (!dmxdevfilter->feed.sec)
 506                         break;
 507                 dvb_dmxdev_feed_stop(dmxdevfilter);
 508                 if (dmxdevfilter->filter.sec)
 509                         dmxdevfilter->feed.sec->
 510                             release_filter(dmxdevfilter->feed.sec,
 511                                            dmxdevfilter->filter.sec);
 512                 dvb_dmxdev_feed_restart(dmxdevfilter);
 513                 dmxdevfilter->feed.sec = NULL;
 514                 break;
 515         case DMXDEV_TYPE_PES:
 516                 dvb_dmxdev_feed_stop(dmxdevfilter);
 517                 demux = dmxdevfilter->dev->demux;
 518                 list_for_each_entry(feed, &dmxdevfilter->feed.ts, next) {
 519                         demux->release_ts_feed(demux, feed->ts);
 520                         feed->ts = NULL;
 521                 }
 522                 break;
 523         default:
 524                 if (dmxdevfilter->state == DMXDEV_STATE_ALLOCATED)
 525                         return 0;
 526                 return -EINVAL;
 527         }
 528
 529         dvb_ringbuffer_flush(&dmxdevfilter->buffer);
 530         return 0;
 531 }
 532
 533 static void dvb_dmxdev_delete_pids(struct dmxdev_filter *dmxdevfilter)
 534 {
 535         struct dmxdev_feed *feed, *tmp;
 536
 537         /* delete all PIDs */
 538         list_for_each_entry_safe(feed, tmp, &dmxdevfilter->feed.ts, next) {
 539                 list_del(&feed->next);
 540                 kfree(feed);
 541         }
 542
 543         BUG_ON(!list_empty(&dmxdevfilter->feed.ts));
 544 }
 545
 546 static inline int dvb_dmxdev_filter_reset(struct dmxdev_filter *dmxdevfilter)
 547 {
 548         if (dmxdevfilter->state < DMXDEV_STATE_SET)
 549                 return 0;
 550
 551         if (dmxdevfilter->type == DMXDEV_TYPE_PES)
 552                 dvb_dmxdev_delete_pids(dmxdevfilter);
 553
 554         dmxdevfilter->type = DMXDEV_TYPE_NONE;
 555         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
 556         return 0;
 557 }
 558
 559 static int dvb_dmxdev_start_feed(struct dmxdev *dmxdev,
 560                                  struct dmxdev_filter *filter,
 561                                  struct dmxdev_feed *feed)
 562 {
 563         ktime_t timeout = 0;
 564         struct dmx_pes_filter_params *para = &filter->params.pes;
 565         enum dmx_output otype;
 566         int ret;
 567         int ts_type;
 568         enum dmx_ts_pes ts_pes;
 569         struct dmx_ts_feed *tsfeed;
 570
 571         feed->ts = NULL;
 572         otype = para->output;
 573
 574         ts_pes = para->pes_type;
 575
 576         if (ts_pes < DMX_PES_OTHER)
 577                 ts_type = TS_DECODER;
 578         else
 579                 ts_type = 0;
 580
 581         if (otype == DMX_OUT_TS_TAP)
 582                 ts_type |= TS_PACKET;
 583         else if (otype == DMX_OUT_TSDEMUX_TAP)
 584                 ts_type |= TS_PACKET | TS_DEMUX;
 585         else if (otype == DMX_OUT_TAP)
 586                 ts_type |= TS_PACKET | TS_DEMUX | TS_PAYLOAD_ONLY;
 587
 588         ret = dmxdev->demux->allocate_ts_feed(dmxdev->demux, &feed->ts,
 589                                               dvb_dmxdev_ts_callback);
 590         if (ret < 0)
 591                 return ret;
 592
 593         tsfeed = feed->ts;
 594         tsfeed->priv = filter;
 595
 596         ret = tsfeed->set(tsfeed, feed->pid, ts_type, ts_pes, timeout);
 597         if (ret < 0) {
 598                 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
 599                 return ret;
 600         }
 601
 602         ret = tsfeed->start_filtering(tsfeed);
 603         if (ret < 0) {
 604                 dmxdev->demux->release_ts_feed(dmxdev->demux, tsfeed);
 605                 return ret;
 606         }
 607
 608         return 0;
 609 }
 610
 611 static int dvb_dmxdev_filter_start(struct dmxdev_filter *filter)
 612 {
 613         struct dmxdev *dmxdev = filter->dev;
 614         struct dmxdev_feed *feed;
 615         void *mem;
 616         int ret, i;
 617
 618         if (filter->state < DMXDEV_STATE_SET)
 619                 return -EINVAL;
 620
 621         if (filter->state >= DMXDEV_STATE_GO)
 622                 dvb_dmxdev_filter_stop(filter);
 623
 624         if (!filter->buffer.data) {
 625                 mem = vmalloc(filter->buffer.size);
 626                 if (!mem)
 627                         return -ENOMEM;
 628                 spin_lock_irq(&filter->dev->lock);
 629                 filter->buffer.data = mem;
 630                 spin_unlock_irq(&filter->dev->lock);
 631         }
 632
 633         dvb_ringbuffer_flush(&filter->buffer);
 634
 635         switch (filter->type) {
 636         case DMXDEV_TYPE_SEC:
 637         {
 638                 struct dmx_sct_filter_params *para = &filter->params.sec;
 639                 struct dmx_section_filter **secfilter = &filter->filter.sec;
 640                 struct dmx_section_feed **secfeed = &filter->feed.sec;
 641
 642                 *secfilter = NULL;
 643                 *secfeed = NULL;
 644
 645
 646                 /* find active filter/feed with same PID */
 647                 for (i = 0; i < dmxdev->filternum; i++) {
 648                         if (dmxdev->filter[i].state >= DMXDEV_STATE_GO &&
 649                             dmxdev->filter[i].type == DMXDEV_TYPE_SEC &&
 650                             dmxdev->filter[i].params.sec.pid == para->pid) {
 651                                 *secfeed = dmxdev->filter[i].feed.sec;
 652                                 break;
 653                         }
 654                 }
 655
 656                 /* if no feed found, try to allocate new one */
 657                 if (!*secfeed) {
 658                         ret = dmxdev->demux->allocate_section_feed(dmxdev->demux,
 659                                                                    secfeed,
 660                                                                    dvb_dmxdev_section_callback);
 661                         if (ret < 0) {
 662                                 pr_err("DVB (%s): could not alloc feed\n",
 663                                        __func__);
 664                                 return ret;
 665                         }
 666
 667                         ret = (*secfeed)->set(*secfeed, para->pid,
 668                                               (para->flags & DMX_CHECK_CRC) ? 1 : 0);
 669                         if (ret < 0) {
 670                                 pr_err("DVB (%s): could not set feed\n",
 671                                        __func__);
 672                                 dvb_dmxdev_feed_restart(filter);
 673                                 return ret;
 674                         }
 675                 } else {
 676                         dvb_dmxdev_feed_stop(filter);
 677                 }
 678
 679                 ret = (*secfeed)->allocate_filter(*secfeed, secfilter);
 680                 if (ret < 0) {
 681                         dvb_dmxdev_feed_restart(filter);
 682                         filter->feed.sec->start_filtering(*secfeed);
 683                         dprintk("could not get filter\n");
 684                         return ret;
 685                 }
 686
 687                 (*secfilter)->priv = filter;
 688
 689                 memcpy(&((*secfilter)->filter_value[3]),
 690                        &(para->filter.filter[1]), DMX_FILTER_SIZE - 1);
 691                 memcpy(&(*secfilter)->filter_mask[3],
 692                        &para->filter.mask[1], DMX_FILTER_SIZE - 1);
 693                 memcpy(&(*secfilter)->filter_mode[3],
 694                        &para->filter.mode[1], DMX_FILTER_SIZE - 1);
 695
 696                 (*secfilter)->filter_value[0] = para->filter.filter[0];
 697                 (*secfilter)->filter_mask[0] = para->filter.mask[0];
 698                 (*secfilter)->filter_mode[0] = para->filter.mode[0];
 699                 (*secfilter)->filter_mask[1] = 0;
 700                 (*secfilter)->filter_mask[2] = 0;
 701
 702                 filter->todo = 0;
 703
 704                 ret = filter->feed.sec->start_filtering(filter->feed.sec);
 705                 if (ret < 0)
 706                         return ret;
 707
 708                 dvb_dmxdev_filter_timer(filter);
 709                 break;
 710         }
 711         case DMXDEV_TYPE_PES:
 712                 list_for_each_entry(feed, &filter->feed.ts, next) {
 713                         ret = dvb_dmxdev_start_feed(dmxdev, filter, feed);
 714                         if (ret < 0) {
 715                                 dvb_dmxdev_filter_stop(filter);
 716                                 return ret;
 717                         }
 718                 }
 719                 break;
 720         default:
 721                 return -EINVAL;
 722         }
 723
 724         dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
 725         return 0;
 726 }
 727
 728 static int dvb_demux_open(struct inode *inode, struct file *file)
 729 {
 730         struct dvb_device *dvbdev = file->private_data;
 731         struct dmxdev *dmxdev = dvbdev->priv;
 732         int i;
 733         struct dmxdev_filter *dmxdevfilter;
 734
 735         if (!dmxdev->filter)
 736                 return -EINVAL;
 737
 738         if (mutex_lock_interruptible(&dmxdev->mutex))
 739                 return -ERESTARTSYS;
 740
 741         for (i = 0; i < dmxdev->filternum; i++)
 742                 if (dmxdev->filter[i].state == DMXDEV_STATE_FREE)
 743                         break;
 744
 745         if (i == dmxdev->filternum) {
 746                 mutex_unlock(&dmxdev->mutex);
 747                 return -EMFILE;
 748         }
 749
 750         dmxdevfilter = &dmxdev->filter[i];
 751         mutex_init(&dmxdevfilter->mutex);
 752         file->private_data = dmxdevfilter;
 753
 754         dvb_ringbuffer_init(&dmxdevfilter->buffer, NULL, 8192);
 755         dmxdevfilter->type = DMXDEV_TYPE_NONE;
 756         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
 757         init_timer(&dmxdevfilter->timer);
 758
 759         dvbdev->users++;
 760
 761         mutex_unlock(&dmxdev->mutex);
 762         return 0;
 763 }
 764
 765 static int dvb_dmxdev_filter_free(struct dmxdev *dmxdev,
 766                                   struct dmxdev_filter *dmxdevfilter)
 767 {
 768         mutex_lock(&dmxdev->mutex);
 769         mutex_lock(&dmxdevfilter->mutex);
 770
 771         dvb_dmxdev_filter_stop(dmxdevfilter);
 772         dvb_dmxdev_filter_reset(dmxdevfilter);
 773
 774         if (dmxdevfilter->buffer.data) {
 775                 void *mem = dmxdevfilter->buffer.data;
 776
 777                 spin_lock_irq(&dmxdev->lock);
 778                 dmxdevfilter->buffer.data = NULL;
 779                 spin_unlock_irq(&dmxdev->lock);
 780                 vfree(mem);
 781         }
 782
 783         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_FREE);
 784         wake_up(&dmxdevfilter->buffer.queue);
 785         mutex_unlock(&dmxdevfilter->mutex);
 786         mutex_unlock(&dmxdev->mutex);
 787         return 0;
 788 }
 789
 790 static inline void invert_mode(struct dmx_filter *filter)
 791 {
 792         int i;
 793
 794         for (i = 0; i < DMX_FILTER_SIZE; i++)
 795                 filter->mode[i] ^= 0xff;
 796 }
 797
 798 static int dvb_dmxdev_add_pid(struct dmxdev *dmxdev,
 799                               struct dmxdev_filter *filter, u16 pid)
 800 {
 801         struct dmxdev_feed *feed;
 802
 803         if ((filter->type != DMXDEV_TYPE_PES) ||
 804             (filter->state < DMXDEV_STATE_SET))
 805                 return -EINVAL;
 806
 807         /* only TS packet filters may have multiple PIDs */
 808         if ((filter->params.pes.output != DMX_OUT_TSDEMUX_TAP) &&
 809             (!list_empty(&filter->feed.ts)))
 810                 return -EINVAL;
 811
 812         feed = kzalloc(sizeof(struct dmxdev_feed), GFP_KERNEL);
 813         if (feed == NULL)
 814                 return -ENOMEM;
 815
 816         feed->pid = pid;
 817         list_add(&feed->next, &filter->feed.ts);
 818
 819         if (filter->state >= DMXDEV_STATE_GO)
 820                 return dvb_dmxdev_start_feed(dmxdev, filter, feed);
 821
 822         return 0;
 823 }
 824
 825 static int dvb_dmxdev_remove_pid(struct dmxdev *dmxdev,
 826                                   struct dmxdev_filter *filter, u16 pid)
 827 {
 828         struct dmxdev_feed *feed, *tmp;
 829
 830         if ((filter->type != DMXDEV_TYPE_PES) ||
 831             (filter->state < DMXDEV_STATE_SET))
 832                 return -EINVAL;
 833
 834         list_for_each_entry_safe(feed, tmp, &filter->feed.ts, next) {
 835                 if ((feed->pid == pid) && (feed->ts != NULL)) {
 836                         feed->ts->stop_filtering(feed->ts);
 837                         filter->dev->demux->release_ts_feed(filter->dev->demux,
 838                                                             feed->ts);
 839                         list_del(&feed->next);
 840                         kfree(feed);
 841                 }
 842         }
 843
 844         return 0;
 845 }
 846
 847 static int dvb_dmxdev_filter_set(struct dmxdev *dmxdev,
 848                                  struct dmxdev_filter *dmxdevfilter,
 849                                  struct dmx_sct_filter_params *params)
 850 {
 851         dprintk("%s: PID=0x%04x, flags=%02x, timeout=%d\n",
 852                 __func__, params->pid, params->flags, params->timeout);
 853
 854         dvb_dmxdev_filter_stop(dmxdevfilter);
 855
 856         dmxdevfilter->type = DMXDEV_TYPE_SEC;
 857         memcpy(&dmxdevfilter->params.sec,
 858                params, sizeof(struct dmx_sct_filter_params));
 859         invert_mode(&dmxdevfilter->params.sec.filter);
 860         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 861
 862         if (params->flags & DMX_IMMEDIATE_START)
 863                 return dvb_dmxdev_filter_start(dmxdevfilter);
 864
 865         return 0;
 866 }
 867
 868 static int dvb_dmxdev_pes_filter_set(struct dmxdev *dmxdev,
 869                                      struct dmxdev_filter *dmxdevfilter,
 870                                      struct dmx_pes_filter_params *params)
 871 {
 872         int ret;
 873
 874         dvb_dmxdev_filter_stop(dmxdevfilter);
 875         dvb_dmxdev_filter_reset(dmxdevfilter);
 876
 877         if ((unsigned int)params->pes_type > DMX_PES_OTHER)
 878                 return -EINVAL;
 879
 880         dmxdevfilter->type = DMXDEV_TYPE_PES;
 881         memcpy(&dmxdevfilter->params, params,
 882                sizeof(struct dmx_pes_filter_params));
 883         INIT_LIST_HEAD(&dmxdevfilter->feed.ts);
 884
 885         dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);
 886
 887         ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter,
 888                                  dmxdevfilter->params.pes.pid);
 889         if (ret < 0)
 890                 return ret;
 891
 892         if (params->flags & DMX_IMMEDIATE_START)
 893                 return dvb_dmxdev_filter_start(dmxdevfilter);
 894
 895         return 0;
 896 }
 897
 898 static ssize_t dvb_dmxdev_read_sec(struct dmxdev_filter *dfil,
 899                                    struct file *file, char __user *buf,
 900                                    size_t count, loff_t *ppos)
 901 {
 902         int result, hcount;
 903         int done = 0;
 904
 905         if (dfil->todo <= 0) {
 906                 hcount = 3 + dfil->todo;
 907                 if (hcount > count)
 908                         hcount = count;
 909                 result = dvb_dmxdev_buffer_read(&dfil->buffer,
 910                                                 file->f_flags & O_NONBLOCK,
 911                                                 buf, hcount, ppos);
 912                 if (result < 0) {
 913                         dfil->todo = 0;
 914                         return result;
 915                 }
 916                 if (copy_from_user(dfil->secheader - dfil->todo, buf, result))
 917                         return -EFAULT;
 918                 buf += result;
 919                 done = result;
 920                 count -= result;
 921                 dfil->todo -= result;
 922                 if (dfil->todo > -3)
 923                         return done;
 924                 dfil->todo = ((dfil->secheader[1] << 8) | dfil->secheader[2]) & 0xfff;
 925                 if (!count)
 926                         return done;
 927         }
 928         if (count > dfil->todo)
 929                 count = dfil->todo;
 930         result = dvb_dmxdev_buffer_read(&dfil->buffer,
 931                                         file->f_flags & O_NONBLOCK,
 932                                         buf, count, ppos);
 933         if (result < 0)
 934                 return result;
 935         dfil->todo -= result;
 936         return (result + done);
 937 }
 938
 939 static ssize_t
 940 dvb_demux_read(struct file *file, char __user *buf, size_t count,
 941                loff_t *ppos)
 942 {
 943         struct dmxdev_filter *dmxdevfilter = file->private_data;
 944         int ret;
 945
 946         if (mutex_lock_interruptible(&dmxdevfilter->mutex))
 947                 return -ERESTARTSYS;
 948
 949         if (dmxdevfilter->type == DMXDEV_TYPE_SEC)
 950                 ret = dvb_dmxdev_read_sec(dmxdevfilter, file, buf, count, ppos);
 951         else
 952                 ret = dvb_dmxdev_buffer_read(&dmxdevfilter->buffer,
 953                                              file->f_flags & O_NONBLOCK,
 954                                              buf, count, ppos);
 955
 956         mutex_unlock(&dmxdevfilter->mutex);
 957         return ret;
 958 }
 959
 960 static int dvb_demux_do_ioctl(struct file *file,
 961                               unsigned int cmd, void *parg)
 962 {
 963         struct dmxdev_filter *dmxdevfilter = file->private_data;
 964         struct dmxdev *dmxdev = dmxdevfilter->dev;
 965         unsigned long arg = (unsigned long)parg;
 966         int ret = 0;
 967
 968         if (mutex_lock_interruptible(&dmxdev->mutex))
 969                 return -ERESTARTSYS;
 970
 971         switch (cmd) {
 972         case DMX_START:
 973                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
 974                         mutex_unlock(&dmxdev->mutex);
 975                         return -ERESTARTSYS;
 976                 }
 977                 if (dmxdevfilter->state < DMXDEV_STATE_SET)
 978                         ret = -EINVAL;
 979                 else
 980                         ret = dvb_dmxdev_filter_start(dmxdevfilter);
 981                 mutex_unlock(&dmxdevfilter->mutex);
 982                 break;
 983
 984         case DMX_STOP:
 985                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
 986                         mutex_unlock(&dmxdev->mutex);
 987                         return -ERESTARTSYS;
 988                 }
 989                 ret = dvb_dmxdev_filter_stop(dmxdevfilter);
 990                 mutex_unlock(&dmxdevfilter->mutex);
 991                 break;
 992
 993         case DMX_SET_FILTER:
 994                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
 995                         mutex_unlock(&dmxdev->mutex);
 996                         return -ERESTARTSYS;
 997                 }
 998                 ret = dvb_dmxdev_filter_set(dmxdev, dmxdevfilter, parg);
 999                 mutex_unlock(&dmxdevfilter->mutex);
1000                 break;
1001
1002         case DMX_SET_PES_FILTER:
1003                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1004                         mutex_unlock(&dmxdev->mutex);
1005                         return -ERESTARTSYS;
1006                 }
1007                 ret = dvb_dmxdev_pes_filter_set(dmxdev, dmxdevfilter, parg);
1008                 mutex_unlock(&dmxdevfilter->mutex);
1009                 break;
1010
1011         case DMX_SET_BUFFER_SIZE:
1012                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1013                         mutex_unlock(&dmxdev->mutex);
1014                         return -ERESTARTSYS;
1015                 }
1016                 ret = dvb_dmxdev_set_buffer_size(dmxdevfilter, arg);
1017                 mutex_unlock(&dmxdevfilter->mutex);
1018                 break;
1019
1020         case DMX_GET_PES_PIDS:
1021                 if (!dmxdev->demux->get_pes_pids) {
1022                         ret = -EINVAL;
1023                         break;
1024                 }
1025                 dmxdev->demux->get_pes_pids(dmxdev->demux, parg);
1026                 break;
1027
1028         case DMX_GET_STC:
1029                 if (!dmxdev->demux->get_stc) {
1030                         ret = -EINVAL;
1031                         break;
1032                 }
1033                 ret = dmxdev->demux->get_stc(dmxdev->demux,
1034                                              ((struct dmx_stc *)parg)->num,
1035                                              &((struct dmx_stc *)parg)->stc,
1036                                              &((struct dmx_stc *)parg)->base);
1037                 break;
1038
1039         case DMX_ADD_PID:
1040                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1041                         ret = -ERESTARTSYS;
1042                         break;
1043                 }
1044                 ret = dvb_dmxdev_add_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1045                 mutex_unlock(&dmxdevfilter->mutex);
1046                 break;
1047
1048         case DMX_REMOVE_PID:
1049                 if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
1050                         ret = -ERESTARTSYS;
1051                         break;
1052                 }
1053                 ret = dvb_dmxdev_remove_pid(dmxdev, dmxdevfilter, *(u16 *)parg);
1054                 mutex_unlock(&dmxdevfilter->mutex);
1055                 break;
1056
1057         default:
1058                 ret = -ENOTTY;
1059                 break;
1060         }
1061         mutex_unlock(&dmxdev->mutex);
1062         return ret;
1063 }
1064
1065 static long dvb_demux_ioctl(struct file *file, unsigned int cmd,
1066                             unsigned long arg)
1067 {
1068         return dvb_usercopy(file, cmd, arg, dvb_demux_do_ioctl);
1069 }
1070
1071 static unsigned int dvb_demux_poll(struct file *file, poll_table *wait)
1072 {
1073         struct dmxdev_filter *dmxdevfilter = file->private_data;
1074         unsigned int mask = 0;
1075
1076         if ((!dmxdevfilter) || dmxdevfilter->dev->exit)
1077                 return POLLERR;
1078
1079         poll_wait(file, &dmxdevfilter->buffer.queue, wait);
1080
1081         if (dmxdevfilter->state != DMXDEV_STATE_GO &&
1082             dmxdevfilter->state != DMXDEV_STATE_DONE &&
1083             dmxdevfilter->state != DMXDEV_STATE_TIMEDOUT)
1084                 return 0;
1085
1086         if (dmxdevfilter->buffer.error)
1087                 mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);
1088
1089         if (!dvb_ringbuffer_empty(&dmxdevfilter->buffer))
1090                 mask |= (POLLIN | POLLRDNORM | POLLPRI);
1091
1092         return mask;
1093 }
1094
1095 static int dvb_demux_release(struct inode *inode, struct file *file)
1096 {
1097         struct dmxdev_filter *dmxdevfilter = file->private_data;
1098         struct dmxdev *dmxdev = dmxdevfilter->dev;
1099
1100         int ret;
1101
1102         ret = dvb_dmxdev_filter_free(dmxdev, dmxdevfilter);
1103
1104         mutex_lock(&dmxdev->mutex);
1105         dmxdev->dvbdev->users--;
1106         if (dmxdev->dvbdev->users == 1 && dmxdev->exit == 1) {
1107                 mutex_unlock(&dmxdev->mutex);
1108                 wake_up(&dmxdev->dvbdev->wait_queue);
1109         } else
1110                 mutex_unlock(&dmxdev->mutex);
1111
1112         return ret;
1113 }
1114
1115 static const struct file_operations dvb_demux_fops = {
1116         .owner = THIS_MODULE,
1117         .read = dvb_demux_read,
1118         .unlocked_ioctl = dvb_demux_ioctl,
1119         .open = dvb_demux_open,
1120         .release = dvb_demux_release,
1121         .poll = dvb_demux_poll,
1122         .llseek = default_llseek,
1123 };
1124
1125 static const struct dvb_device dvbdev_demux = {
1126         .priv = NULL,
1127         .users = 1,
1128         .writers = 1,
1129 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1130         .name = "dvb-demux",
1131 #endif
1132         .fops = &dvb_demux_fops
1133 };
1134
1135 static int dvb_dvr_do_ioctl(struct file *file,
1136                             unsigned int cmd, void *parg)
1137 {
1138         struct dvb_device *dvbdev = file->private_data;
1139         struct dmxdev *dmxdev = dvbdev->priv;
1140         unsigned long arg = (unsigned long)parg;
1141         int ret;
1142
1143         if (mutex_lock_interruptible(&dmxdev->mutex))
1144                 return -ERESTARTSYS;
1145
1146         switch (cmd) {
1147         case DMX_SET_BUFFER_SIZE:
1148                 ret = dvb_dvr_set_buffer_size(dmxdev, arg);
1149                 break;
1150
1151         default:
1152                 ret = -EINVAL;
1153                 break;
1154         }
1155         mutex_unlock(&dmxdev->mutex);
1156         return ret;
1157 }
1158
1159 static long dvb_dvr_ioctl(struct file *file,
1160                          unsigned int cmd, unsigned long arg)
1161 {
1162         return dvb_usercopy(file, cmd, arg, dvb_dvr_do_ioctl);
1163 }
1164
1165 static unsigned int dvb_dvr_poll(struct file *file, poll_table *wait)
1166 {
1167         struct dvb_device *dvbdev = file->private_data;
1168         struct dmxdev *dmxdev = dvbdev->priv;
1169         unsigned int mask = 0;
1170
1171         dprintk("%s\n", __func__);
1172
1173         if (dmxdev->exit)
1174                 return POLLERR;
1175
1176         poll_wait(file, &dmxdev->dvr_buffer.queue, wait);
1177
1178         if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
1179                 if (dmxdev->dvr_buffer.error)
1180                         mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);
1181
1182                 if (!dvb_ringbuffer_empty(&dmxdev->dvr_buffer))
1183                         mask |= (POLLIN | POLLRDNORM | POLLPRI);
1184         } else
1185                 mask |= (POLLOUT | POLLWRNORM | POLLPRI);
1186
1187         return mask;
1188 }
1189
1190 static const struct file_operations dvb_dvr_fops = {
1191         .owner = THIS_MODULE,
1192         .read = dvb_dvr_read,
1193         .write = dvb_dvr_write,
1194         .unlocked_ioctl = dvb_dvr_ioctl,
1195         .open = dvb_dvr_open,
1196         .release = dvb_dvr_release,
1197         .poll = dvb_dvr_poll,
1198         .llseek = default_llseek,
1199 };
1200
1201 static const struct dvb_device dvbdev_dvr = {
1202         .priv = NULL,
1203         .readers = 1,
1204         .users = 1,
1205 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1206         .name = "dvb-dvr",
1207 #endif
1208         .fops = &dvb_dvr_fops
1209 };
1210 int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *dvb_adapter)
1211 {
1212         int i;
1213
1214         if (dmxdev->demux->open(dmxdev->demux) < 0)
1215                 return -EUSERS;
1216
1217         dmxdev->filter = vmalloc(dmxdev->filternum * sizeof(struct dmxdev_filter));
1218         if (!dmxdev->filter)
1219                 return -ENOMEM;
1220
1221         mutex_init(&dmxdev->mutex);
1222         spin_lock_init(&dmxdev->lock);
1223         for (i = 0; i < dmxdev->filternum; i++) {
1224                 dmxdev->filter[i].dev = dmxdev;
1225                 dmxdev->filter[i].buffer.data = NULL;
1226                 dvb_dmxdev_filter_state_set(&dmxdev->filter[i],
1227                                             DMXDEV_STATE_FREE);
1228         }
1229
1230         dvb_register_device(dvb_adapter, &dmxdev->dvbdev, &dvbdev_demux, dmxdev,
1231                             DVB_DEVICE_DEMUX, dmxdev->filternum);
1232         dvb_register_device(dvb_adapter, &dmxdev->dvr_dvbdev, &dvbdev_dvr,
1233                             dmxdev, DVB_DEVICE_DVR, dmxdev->filternum);
1234
1235         dvb_ringbuffer_init(&dmxdev->dvr_buffer, NULL, 8192);
1236
1237         return 0;
1238 }
1239
1240 EXPORT_SYMBOL(dvb_dmxdev_init);
1241
1242 void dvb_dmxdev_release(struct dmxdev *dmxdev)
1243 {
1244         dmxdev->exit = 1;
1245         if (dmxdev->dvbdev->users > 1) {
1246                 wait_event(dmxdev->dvbdev->wait_queue,
1247                                 dmxdev->dvbdev->users == 1);
1248         }
1249         if (dmxdev->dvr_dvbdev->users > 1) {
1250                 wait_event(dmxdev->dvr_dvbdev->wait_queue,
1251                                 dmxdev->dvr_dvbdev->users == 1);
1252         }
1253
1254         dvb_unregister_device(dmxdev->dvbdev);
1255         dvb_unregister_device(dmxdev->dvr_dvbdev);
1256
1257         vfree(dmxdev->filter);
1258         dmxdev->filter = NULL;
1259         dmxdev->demux->close(dmxdev->demux);
1260 }
1261
1262 EXPORT_SYMBOL(dvb_dmxdev_release);