drivers/media/dvb-core/dvb_demux.c

   1 /*
   2  * dvb_demux.c - DVB kernel demux API
   3  *
   4  * Copyright (C) 2000-2001 Ralph  Metzler <[email protected]>
   5  *                     & Marcus Metzler <[email protected]>
   6  *                       for convergence integrated media GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public License
  10  * as published by the Free Software Foundation; either version 2.1
  11  * of the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  */
  19
  20 #define pr_fmt(fmt) "dvb_demux: " fmt
  21
  22 #include <linux/sched/signal.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/slab.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/module.h>
  27 #include <linux/poll.h>
  28 #include <linux/string.h>
  29 #include <linux/crc32.h>
  30 #include <linux/uaccess.h>
  31 #include <asm/div64.h>
  32
  33 #include <media/dvb_demux.h>
  34
  35 static int dvb_demux_tscheck;
  36 module_param(dvb_demux_tscheck, int, 0644);
  37 MODULE_PARM_DESC(dvb_demux_tscheck,
  38                 "enable transport stream continuity and TEI check");
  39
  40 static int dvb_demux_speedcheck;
  41 module_param(dvb_demux_speedcheck, int, 0644);
  42 MODULE_PARM_DESC(dvb_demux_speedcheck,
  43                 "enable transport stream speed check");
  44
  45 static int dvb_demux_feed_err_pkts = 1;
  46 module_param(dvb_demux_feed_err_pkts, int, 0644);
  47 MODULE_PARM_DESC(dvb_demux_feed_err_pkts,
  48                  "when set to 0, drop packets with the TEI bit set (1 by default)");
  49
  50 #define dprintk(fmt, arg...) \
  51         printk(KERN_DEBUG pr_fmt("%s: " fmt),  __func__, ##arg)
  52
  53 #define dprintk_tscheck(x...) do {                      \
  54         if (dvb_demux_tscheck && printk_ratelimit())    \
  55                 dprintk(x);                             \
  56 } while (0)
  57
  58 /******************************************************************************
  59  * static inlined helper functions
  60  ******************************************************************************/
  61
  62 static inline u16 section_length(const u8 *buf)
  63 {
  64         return 3 + ((buf[1] & 0x0f) << 8) + buf[2];
  65 }
  66
  67 static inline u16 ts_pid(const u8 *buf)
  68 {
  69         return ((buf[1] & 0x1f) << 8) + buf[2];
  70 }
  71
  72 static inline u8 payload(const u8 *tsp)
  73 {
  74         if (!(tsp[3] & 0x10))   // no payload?
  75                 return 0;
  76
  77         if (tsp[3] & 0x20) {    // adaptation field?
  78                 if (tsp[4] > 183)       // corrupted data?
  79                         return 0;
  80                 else
  81                         return 184 - 1 - tsp[4];
  82         }
  83
  84         return 184;
  85 }
  86
  87 static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len)
  88 {
  89         return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len));
  90 }
  91
  92 static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s,
  93                             size_t len)
  94 {
  95         memcpy(d, s, len);
  96 }
  97
  98 /******************************************************************************
  99  * Software filter functions
 100  ******************************************************************************/
 101
 102 static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed,
 103                                            const u8 *buf)
 104 {
 105         int count = payload(buf);
 106         int p;
 107 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 108         int ccok;
 109         u8 cc;
 110 #endif
 111
 112         if (count == 0)
 113                 return -1;
 114
 115         p = 188 - count;
 116
 117 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 118         cc = buf[3] & 0x0f;
 119         ccok = ((feed->cc + 1) & 0x0f) == cc;
 120         feed->cc = cc;
 121         if (!ccok)
 122                 dprintk("missed packet: %d instead of %d!\n",
 123                         cc, (feed->cc + 1) & 0x0f);
 124 #endif
 125
 126         if (buf[1] & 0x40)      // PUSI ?
 127                 feed->peslen = 0xfffa;
 128
 129         feed->peslen += count;
 130
 131         return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts);
 132 }
 133
 134 static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed,
 135                                           struct dvb_demux_filter *f)
 136 {
 137         u8 neq = 0;
 138         int i;
 139
 140         for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 141                 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
 142
 143                 if (f->maskandmode[i] & xor)
 144                         return 0;
 145
 146                 neq |= f->maskandnotmode[i] & xor;
 147         }
 148
 149         if (f->doneq && !neq)
 150                 return 0;
 151
 152         return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen,
 153                             NULL, 0, &f->filter);
 154 }
 155
 156 static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed)
 157 {
 158         struct dvb_demux *demux = feed->demux;
 159         struct dvb_demux_filter *f = feed->filter;
 160         struct dmx_section_feed *sec = &feed->feed.sec;
 161         int section_syntax_indicator;
 162
 163         if (!sec->is_filtering)
 164                 return 0;
 165
 166         if (!f)
 167                 return 0;
 168
 169         if (sec->check_crc) {
 170                 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
 171                 if (section_syntax_indicator &&
 172                     demux->check_crc32(feed, sec->secbuf, sec->seclen))
 173                         return -1;
 174         }
 175
 176         do {
 177                 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)
 178                         return -1;
 179         } while ((f = f->next) && sec->is_filtering);
 180
 181         sec->seclen = 0;
 182
 183         return 0;
 184 }
 185
 186 static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
 187 {
 188         struct dmx_section_feed *sec = &feed->feed.sec;
 189
 190 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 191         if (sec->secbufp < sec->tsfeedp) {
 192                 int n = sec->tsfeedp - sec->secbufp;
 193
 194                 /*
 195                  * Section padding is done with 0xff bytes entirely.
 196                  * Due to speed reasons, we won't check all of them
 197                  * but just first and last.
 198                  */
 199                 if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) {
 200                         dprintk("section ts padding loss: %d/%d\n",
 201                                n, sec->tsfeedp);
 202                         dprintk("pad data: %*ph\n", n, sec->secbuf);
 203                 }
 204         }
 205 #endif
 206
 207         sec->tsfeedp = sec->secbufp = sec->seclen = 0;
 208         sec->secbuf = sec->secbuf_base;
 209 }
 210
 211 /*
 212  * Losless Section Demux 1.4.1 by Emard
 213  * Valsecchi Patrick:
 214  *  - middle of section A  (no PUSI)
 215  *  - end of section A and start of section B
 216  *    (with PUSI pointing to the start of the second section)
 217  *
 218  *  In this case, without feed->pusi_seen you'll receive a garbage section
 219  *  consisting of the end of section A. Basically because tsfeedp
 220  *  is incemented and the use=0 condition is not raised
 221  *  when the second packet arrives.
 222  *
 223  * Fix:
 224  * when demux is started, let feed->pusi_seen = false to
 225  * prevent initial feeding of garbage from the end of
 226  * previous section. When you for the first time see PUSI=1
 227  * then set feed->pusi_seen = true
 228  */
 229 static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed,
 230                                               const u8 *buf, u8 len)
 231 {
 232         struct dvb_demux *demux = feed->demux;
 233         struct dmx_section_feed *sec = &feed->feed.sec;
 234         u16 limit, seclen, n;
 235
 236         if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
 237                 return 0;
 238
 239         if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
 240 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 241                 dprintk("section buffer full loss: %d/%d\n",
 242                         sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,
 243                         DMX_MAX_SECFEED_SIZE);
 244 #endif
 245                 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
 246         }
 247
 248         if (len <= 0)
 249                 return 0;
 250
 251         demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
 252         sec->tsfeedp += len;
 253
 254         /*
 255          * Dump all the sections we can find in the data (Emard)
 256          */
 257         limit = sec->tsfeedp;
 258         if (limit > DMX_MAX_SECFEED_SIZE)
 259                 return -1;      /* internal error should never happen */
 260
 261         /* to be sure always set secbuf */
 262         sec->secbuf = sec->secbuf_base + sec->secbufp;
 263
 264         for (n = 0; sec->secbufp + 2 < limit; n++) {
 265                 seclen = section_length(sec->secbuf);
 266                 if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE
 267                     || seclen + sec->secbufp > limit)
 268                         return 0;
 269                 sec->seclen = seclen;
 270                 sec->crc_val = ~0;
 271                 /* dump [secbuf .. secbuf+seclen) */
 272                 if (feed->pusi_seen)
 273                         dvb_dmx_swfilter_section_feed(feed);
 274 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 275                 else
 276                         dprintk("pusi not seen, discarding section data\n");
 277 #endif
 278                 sec->secbufp += seclen; /* secbufp and secbuf moving together is */
 279                 sec->secbuf += seclen;  /* redundant but saves pointer arithmetic */
 280         }
 281
 282         return 0;
 283 }
 284
 285 static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,
 286                                            const u8 *buf)
 287 {
 288         u8 p, count;
 289         int ccok, dc_i = 0;
 290         u8 cc;
 291
 292         count = payload(buf);
 293
 294         if (count == 0)         /* count == 0 if no payload or out of range */
 295                 return -1;
 296
 297         p = 188 - count;        /* payload start */
 298
 299         cc = buf[3] & 0x0f;
 300         ccok = ((feed->cc + 1) & 0x0f) == cc;
 301         feed->cc = cc;
 302
 303         if (buf[3] & 0x20) {
 304                 /* adaption field present, check for discontinuity_indicator */
 305                 if ((buf[4] > 0) && (buf[5] & 0x80))
 306                         dc_i = 1;
 307         }
 308
 309         if (!ccok || dc_i) {
 310 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 311                 if (dc_i)
 312                         dprintk("%d frame with disconnect indicator\n",
 313                                 cc);
 314                 else
 315                         dprintk("discontinuity: %d instead of %d. %d bytes lost\n",
 316                                 cc, (feed->cc + 1) & 0x0f, count + 4);
 317                 /*
 318                  * those bytes under sume circumstances will again be reported
 319                  * in the following dvb_dmx_swfilter_section_new
 320                  */
 321 #endif
 322                 /*
 323                  * Discontinuity detected. Reset pusi_seen to
 324                  * stop feeding of suspicious data until next PUSI=1 arrives
 325                  *
 326                  * FIXME: does it make sense if the MPEG-TS is the one
 327                  *      reporting discontinuity?
 328                  */
 329                 feed->pusi_seen = false;
 330                 dvb_dmx_swfilter_section_new(feed);
 331         }
 332
 333         if (buf[1] & 0x40) {
 334                 /* PUSI=1 (is set), section boundary is here */
 335                 if (count > 1 && buf[p] < count) {
 336                         const u8 *before = &buf[p + 1];
 337                         u8 before_len = buf[p];
 338                         const u8 *after = &before[before_len];
 339                         u8 after_len = count - 1 - before_len;
 340
 341                         dvb_dmx_swfilter_section_copy_dump(feed, before,
 342                                                            before_len);
 343                         /* before start of new section, set pusi_seen */
 344                         feed->pusi_seen = true;
 345                         dvb_dmx_swfilter_section_new(feed);
 346                         dvb_dmx_swfilter_section_copy_dump(feed, after,
 347                                                            after_len);
 348                 }
 349 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 350                 else if (count > 0)
 351                         dprintk("PUSI=1 but %d bytes lost\n", count);
 352 #endif
 353         } else {
 354                 /* PUSI=0 (is not set), no section boundary */
 355                 dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count);
 356         }
 357
 358         return 0;
 359 }
 360
 361 static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed,
 362                                                 const u8 *buf)
 363 {
 364         switch (feed->type) {
 365         case DMX_TYPE_TS:
 366                 if (!feed->feed.ts.is_filtering)
 367                         break;
 368                 if (feed->ts_type & TS_PACKET) {
 369                         if (feed->ts_type & TS_PAYLOAD_ONLY)
 370                                 dvb_dmx_swfilter_payload(feed, buf);
 371                         else
 372                                 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts);
 373                 }
 374                 /* Used only on full-featured devices */
 375                 if (feed->ts_type & TS_DECODER)
 376                         if (feed->demux->write_to_decoder)
 377                                 feed->demux->write_to_decoder(feed, buf, 188);
 378                 break;
 379
 380         case DMX_TYPE_SEC:
 381                 if (!feed->feed.sec.is_filtering)
 382                         break;
 383                 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
 384                         feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
 385                 break;
 386
 387         default:
 388                 break;
 389         }
 390 }
 391
 392 #define DVR_FEED(f)                                                     \
 393         (((f)->type == DMX_TYPE_TS) &&                                  \
 394         ((f)->feed.ts.is_filtering) &&                                  \
 395         (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))
 396
 397 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
 398 {
 399         struct dvb_demux_feed *feed;
 400         u16 pid = ts_pid(buf);
 401         int dvr_done = 0;
 402
 403         if (dvb_demux_speedcheck) {
 404                 ktime_t cur_time;
 405                 u64 speed_bytes, speed_timedelta;
 406
 407                 demux->speed_pkts_cnt++;
 408
 409                 /* show speed every SPEED_PKTS_INTERVAL packets */
 410                 if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) {
 411                         cur_time = ktime_get();
 412
 413                         if (ktime_to_ns(demux->speed_last_time) != 0) {
 414                                 speed_bytes = (u64)demux->speed_pkts_cnt
 415                                         * 188 * 8;
 416                                 /* convert to 1024 basis */
 417                                 speed_bytes = 1000 * div64_u64(speed_bytes,
 418                                                 1024);
 419                                 speed_timedelta = ktime_ms_delta(cur_time,
 420                                                         demux->speed_last_time);
 421                                 if (speed_timedelta)
 422                                         dprintk("TS speed %llu Kbits/sec \n",
 423                                                 div64_u64(speed_bytes,
 424                                                           speed_timedelta));
 425                         }
 426
 427                         demux->speed_last_time = cur_time;
 428                         demux->speed_pkts_cnt = 0;
 429                 }
 430         }
 431
 432         if (buf[1] & 0x80) {
 433                 dprintk_tscheck("TEI detected. PID=0x%x data1=0x%x\n",
 434                                 pid, buf[1]);
 435                 /* data in this packet can't be trusted - drop it unless
 436                  * module option dvb_demux_feed_err_pkts is set */
 437                 if (!dvb_demux_feed_err_pkts)
 438                         return;
 439         } else /* if TEI bit is set, pid may be wrong- skip pkt counter */
 440                 if (demux->cnt_storage && dvb_demux_tscheck) {
 441                         /* check pkt counter */
 442                         if (pid < MAX_PID) {
 443                                 if (buf[3] & 0x10)
 444                                         demux->cnt_storage[pid] =
 445                                                 (demux->cnt_storage[pid] + 1) & 0xf;
 446
 447                                 if ((buf[3] & 0xf) != demux->cnt_storage[pid]) {
 448                                         dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n",
 449                                                         pid, demux->cnt_storage[pid],
 450                                                         buf[3] & 0xf);
 451                                         demux->cnt_storage[pid] = buf[3] & 0xf;
 452                                 }
 453                         }
 454                         /* end check */
 455                 }
 456
 457         list_for_each_entry(feed, &demux->feed_list, list_head) {
 458                 if ((feed->pid != pid) && (feed->pid != 0x2000))
 459                         continue;
 460
 461                 /* copy each packet only once to the dvr device, even
 462                  * if a PID is in multiple filters (e.g. video + PCR) */
 463                 if ((DVR_FEED(feed)) && (dvr_done++))
 464                         continue;
 465
 466                 if (feed->pid == pid)
 467                         dvb_dmx_swfilter_packet_type(feed, buf);
 468                 else if (feed->pid == 0x2000)
 469                         feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts);
 470         }
 471 }
 472
 473 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
 474                               size_t count)
 475 {
 476         unsigned long flags;
 477
 478         spin_lock_irqsave(&demux->lock, flags);
 479
 480         while (count--) {
 481                 if (buf[0] == 0x47)
 482                         dvb_dmx_swfilter_packet(demux, buf);
 483                 buf += 188;
 484         }
 485
 486         spin_unlock_irqrestore(&demux->lock, flags);
 487 }
 488
 489 EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
 490
 491 static inline int find_next_packet(const u8 *buf, int pos, size_t count,
 492                                    const int pktsize)
 493 {
 494         int start = pos, lost;
 495
 496         while (pos < count) {
 497                 if (buf[pos] == 0x47 ||
 498                     (pktsize == 204 && buf[pos] == 0xB8))
 499                         break;
 500                 pos++;
 501         }
 502
 503         lost = pos - start;
 504         if (lost) {
 505                 /* This garbage is part of a valid packet? */
 506                 int backtrack = pos - pktsize;
 507                 if (backtrack >= 0 && (buf[backtrack] == 0x47 ||
 508                     (pktsize == 204 && buf[backtrack] == 0xB8)))
 509                         return backtrack;
 510         }
 511
 512         return pos;
 513 }
 514
 515 /* Filter all pktsize= 188 or 204 sized packets and skip garbage. */
 516 static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf,
 517                 size_t count, const int pktsize)
 518 {
 519         int p = 0, i, j;
 520         const u8 *q;
 521         unsigned long flags;
 522
 523         spin_lock_irqsave(&demux->lock, flags);
 524
 525         if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */
 526                 i = demux->tsbufp;
 527                 j = pktsize - i;
 528                 if (count < j) {
 529                         memcpy(&demux->tsbuf[i], buf, count);
 530                         demux->tsbufp += count;
 531                         goto bailout;
 532                 }
 533                 memcpy(&demux->tsbuf[i], buf, j);
 534                 if (demux->tsbuf[0] == 0x47) /* double check */
 535                         dvb_dmx_swfilter_packet(demux, demux->tsbuf);
 536                 demux->tsbufp = 0;
 537                 p += j;
 538         }
 539
 540         while (1) {
 541                 p = find_next_packet(buf, p, count, pktsize);
 542                 if (p >= count)
 543                         break;
 544                 if (count - p < pktsize)
 545                         break;
 546
 547                 q = &buf[p];
 548
 549                 if (pktsize == 204 && (*q == 0xB8)) {
 550                         memcpy(demux->tsbuf, q, 188);
 551                         demux->tsbuf[0] = 0x47;
 552                         q = demux->tsbuf;
 553                 }
 554                 dvb_dmx_swfilter_packet(demux, q);
 555                 p += pktsize;
 556         }
 557
 558         i = count - p;
 559         if (i) {
 560                 memcpy(demux->tsbuf, &buf[p], i);
 561                 demux->tsbufp = i;
 562                 if (pktsize == 204 && demux->tsbuf[0] == 0xB8)
 563                         demux->tsbuf[0] = 0x47;
 564         }
 565
 566 bailout:
 567         spin_unlock_irqrestore(&demux->lock, flags);
 568 }
 569
 570 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
 571 {
 572         _dvb_dmx_swfilter(demux, buf, count, 188);
 573 }
 574 EXPORT_SYMBOL(dvb_dmx_swfilter);
 575
 576 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
 577 {
 578         _dvb_dmx_swfilter(demux, buf, count, 204);
 579 }
 580 EXPORT_SYMBOL(dvb_dmx_swfilter_204);
 581
 582 void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count)
 583 {
 584         unsigned long flags;
 585
 586         spin_lock_irqsave(&demux->lock, flags);
 587
 588         demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts);
 589
 590         spin_unlock_irqrestore(&demux->lock, flags);
 591 }
 592 EXPORT_SYMBOL(dvb_dmx_swfilter_raw);
 593
 594 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
 595 {
 596         int i;
 597
 598         for (i = 0; i < demux->filternum; i++)
 599                 if (demux->filter[i].state == DMX_STATE_FREE)
 600                         break;
 601
 602         if (i == demux->filternum)
 603                 return NULL;
 604
 605         demux->filter[i].state = DMX_STATE_ALLOCATED;
 606
 607         return &demux->filter[i];
 608 }
 609
 610 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
 611 {
 612         int i;
 613
 614         for (i = 0; i < demux->feednum; i++)
 615                 if (demux->feed[i].state == DMX_STATE_FREE)
 616                         break;
 617
 618         if (i == demux->feednum)
 619                 return NULL;
 620
 621         demux->feed[i].state = DMX_STATE_ALLOCATED;
 622
 623         return &demux->feed[i];
 624 }
 625
 626 static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
 627 {
 628         struct dvb_demux_feed *entry;
 629
 630         list_for_each_entry(entry, &feed->demux->feed_list, list_head)
 631                 if (entry == feed)
 632                         return 1;
 633
 634         return 0;
 635 }
 636
 637 static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
 638 {
 639         spin_lock_irq(&feed->demux->lock);
 640         if (dvb_demux_feed_find(feed)) {
 641                 pr_err("%s: feed already in list (type=%x state=%x pid=%x)\n",
 642                        __func__, feed->type, feed->state, feed->pid);
 643                 goto out;
 644         }
 645
 646         list_add(&feed->list_head, &feed->demux->feed_list);
 647 out:
 648         spin_unlock_irq(&feed->demux->lock);
 649 }
 650
 651 static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
 652 {
 653         spin_lock_irq(&feed->demux->lock);
 654         if (!(dvb_demux_feed_find(feed))) {
 655                 pr_err("%s: feed not in list (type=%x state=%x pid=%x)\n",
 656                        __func__, feed->type, feed->state, feed->pid);
 657                 goto out;
 658         }
 659
 660         list_del(&feed->list_head);
 661 out:
 662         spin_unlock_irq(&feed->demux->lock);
 663 }
 664
 665 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
 666                            enum dmx_ts_pes pes_type, ktime_t timeout)
 667 {
 668         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 669         struct dvb_demux *demux = feed->demux;
 670
 671         if (pid > DMX_MAX_PID)
 672                 return -EINVAL;
 673
 674         if (mutex_lock_interruptible(&demux->mutex))
 675                 return -ERESTARTSYS;
 676
 677         if (ts_type & TS_DECODER) {
 678                 if (pes_type >= DMX_PES_OTHER) {
 679                         mutex_unlock(&demux->mutex);
 680                         return -EINVAL;
 681                 }
 682
 683                 if (demux->pesfilter[pes_type] &&
 684                     demux->pesfilter[pes_type] != feed) {
 685                         mutex_unlock(&demux->mutex);
 686                         return -EINVAL;
 687                 }
 688
 689                 demux->pesfilter[pes_type] = feed;
 690                 demux->pids[pes_type] = pid;
 691         }
 692
 693         dvb_demux_feed_add(feed);
 694
 695         feed->pid = pid;
 696         feed->timeout = timeout;
 697         feed->ts_type = ts_type;
 698         feed->pes_type = pes_type;
 699
 700         feed->state = DMX_STATE_READY;
 701         mutex_unlock(&demux->mutex);
 702
 703         return 0;
 704 }
 705
 706 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
 707 {
 708         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 709         struct dvb_demux *demux = feed->demux;
 710         int ret;
 711
 712         if (mutex_lock_interruptible(&demux->mutex))
 713                 return -ERESTARTSYS;
 714
 715         if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
 716                 mutex_unlock(&demux->mutex);
 717                 return -EINVAL;
 718         }
 719
 720         if (!demux->start_feed) {
 721                 mutex_unlock(&demux->mutex);
 722                 return -ENODEV;
 723         }
 724
 725         if ((ret = demux->start_feed(feed)) < 0) {
 726                 mutex_unlock(&demux->mutex);
 727                 return ret;
 728         }
 729
 730         spin_lock_irq(&demux->lock);
 731         ts_feed->is_filtering = 1;
 732         feed->state = DMX_STATE_GO;
 733         spin_unlock_irq(&demux->lock);
 734         mutex_unlock(&demux->mutex);
 735
 736         return 0;
 737 }
 738
 739 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
 740 {
 741         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 742         struct dvb_demux *demux = feed->demux;
 743         int ret;
 744
 745         mutex_lock(&demux->mutex);
 746
 747         if (feed->state < DMX_STATE_GO) {
 748                 mutex_unlock(&demux->mutex);
 749                 return -EINVAL;
 750         }
 751
 752         if (!demux->stop_feed) {
 753                 mutex_unlock(&demux->mutex);
 754                 return -ENODEV;
 755         }
 756
 757         ret = demux->stop_feed(feed);
 758
 759         spin_lock_irq(&demux->lock);
 760         ts_feed->is_filtering = 0;
 761         feed->state = DMX_STATE_ALLOCATED;
 762         spin_unlock_irq(&demux->lock);
 763         mutex_unlock(&demux->mutex);
 764
 765         return ret;
 766 }
 767
 768 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
 769                                    struct dmx_ts_feed **ts_feed,
 770                                    dmx_ts_cb callback)
 771 {
 772         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 773         struct dvb_demux_feed *feed;
 774
 775         if (mutex_lock_interruptible(&demux->mutex))
 776                 return -ERESTARTSYS;
 777
 778         if (!(feed = dvb_dmx_feed_alloc(demux))) {
 779                 mutex_unlock(&demux->mutex);
 780                 return -EBUSY;
 781         }
 782
 783         feed->type = DMX_TYPE_TS;
 784         feed->cb.ts = callback;
 785         feed->demux = demux;
 786         feed->pid = 0xffff;
 787         feed->peslen = 0xfffa;
 788
 789         (*ts_feed) = &feed->feed.ts;
 790         (*ts_feed)->parent = dmx;
 791         (*ts_feed)->priv = NULL;
 792         (*ts_feed)->is_filtering = 0;
 793         (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
 794         (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
 795         (*ts_feed)->set = dmx_ts_feed_set;
 796
 797         if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
 798                 feed->state = DMX_STATE_FREE;
 799                 mutex_unlock(&demux->mutex);
 800                 return -EBUSY;
 801         }
 802
 803         feed->filter->type = DMX_TYPE_TS;
 804         feed->filter->feed = feed;
 805         feed->filter->state = DMX_STATE_READY;
 806
 807         mutex_unlock(&demux->mutex);
 808
 809         return 0;
 810 }
 811
 812 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
 813                                   struct dmx_ts_feed *ts_feed)
 814 {
 815         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 816         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 817
 818         mutex_lock(&demux->mutex);
 819
 820         if (feed->state == DMX_STATE_FREE) {
 821                 mutex_unlock(&demux->mutex);
 822                 return -EINVAL;
 823         }
 824
 825         feed->state = DMX_STATE_FREE;
 826         feed->filter->state = DMX_STATE_FREE;
 827
 828         dvb_demux_feed_del(feed);
 829
 830         feed->pid = 0xffff;
 831
 832         if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER)
 833                 demux->pesfilter[feed->pes_type] = NULL;
 834
 835         mutex_unlock(&demux->mutex);
 836         return 0;
 837 }
 838
 839 /******************************************************************************
 840  * dmx_section_feed API calls
 841  ******************************************************************************/
 842
 843 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
 844                                             struct dmx_section_filter **filter)
 845 {
 846         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 847         struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
 848         struct dvb_demux_filter *dvbdmxfilter;
 849
 850         if (mutex_lock_interruptible(&dvbdemux->mutex))
 851                 return -ERESTARTSYS;
 852
 853         dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
 854         if (!dvbdmxfilter) {
 855                 mutex_unlock(&dvbdemux->mutex);
 856                 return -EBUSY;
 857         }
 858
 859         spin_lock_irq(&dvbdemux->lock);
 860         *filter = &dvbdmxfilter->filter;
 861         (*filter)->parent = feed;
 862         (*filter)->priv = NULL;
 863         dvbdmxfilter->feed = dvbdmxfeed;
 864         dvbdmxfilter->type = DMX_TYPE_SEC;
 865         dvbdmxfilter->state = DMX_STATE_READY;
 866         dvbdmxfilter->next = dvbdmxfeed->filter;
 867         dvbdmxfeed->filter = dvbdmxfilter;
 868         spin_unlock_irq(&dvbdemux->lock);
 869
 870         mutex_unlock(&dvbdemux->mutex);
 871         return 0;
 872 }
 873
 874 static int dmx_section_feed_set(struct dmx_section_feed *feed,
 875                                 u16 pid, int check_crc)
 876 {
 877         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 878         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 879
 880         if (pid > 0x1fff)
 881                 return -EINVAL;
 882
 883         if (mutex_lock_interruptible(&dvbdmx->mutex))
 884                 return -ERESTARTSYS;
 885
 886         dvb_demux_feed_add(dvbdmxfeed);
 887
 888         dvbdmxfeed->pid = pid;
 889         dvbdmxfeed->feed.sec.check_crc = check_crc;
 890
 891         dvbdmxfeed->state = DMX_STATE_READY;
 892         mutex_unlock(&dvbdmx->mutex);
 893         return 0;
 894 }
 895
 896 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
 897 {
 898         int i;
 899         struct dvb_demux_filter *f;
 900         struct dmx_section_filter *sf;
 901         u8 mask, mode, doneq;
 902
 903         if (!(f = dvbdmxfeed->filter))
 904                 return;
 905         do {
 906                 sf = &f->filter;
 907                 doneq = false;
 908                 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 909                         mode = sf->filter_mode[i];
 910                         mask = sf->filter_mask[i];
 911                         f->maskandmode[i] = mask & mode;
 912                         doneq |= f->maskandnotmode[i] = mask & ~mode;
 913                 }
 914                 f->doneq = doneq ? true : false;
 915         } while ((f = f->next));
 916 }
 917
 918 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
 919 {
 920         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 921         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 922         int ret;
 923
 924         if (mutex_lock_interruptible(&dvbdmx->mutex))
 925                 return -ERESTARTSYS;
 926
 927         if (feed->is_filtering) {
 928                 mutex_unlock(&dvbdmx->mutex);
 929                 return -EBUSY;
 930         }
 931
 932         if (!dvbdmxfeed->filter) {
 933                 mutex_unlock(&dvbdmx->mutex);
 934                 return -EINVAL;
 935         }
 936
 937         dvbdmxfeed->feed.sec.tsfeedp = 0;
 938         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
 939         dvbdmxfeed->feed.sec.secbufp = 0;
 940         dvbdmxfeed->feed.sec.seclen = 0;
 941
 942         if (!dvbdmx->start_feed) {
 943                 mutex_unlock(&dvbdmx->mutex);
 944                 return -ENODEV;
 945         }
 946
 947         prepare_secfilters(dvbdmxfeed);
 948
 949         if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
 950                 mutex_unlock(&dvbdmx->mutex);
 951                 return ret;
 952         }
 953
 954         spin_lock_irq(&dvbdmx->lock);
 955         feed->is_filtering = 1;
 956         dvbdmxfeed->state = DMX_STATE_GO;
 957         spin_unlock_irq(&dvbdmx->lock);
 958
 959         mutex_unlock(&dvbdmx->mutex);
 960         return 0;
 961 }
 962
 963 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
 964 {
 965         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 966         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 967         int ret;
 968
 969         mutex_lock(&dvbdmx->mutex);
 970
 971         if (!dvbdmx->stop_feed) {
 972                 mutex_unlock(&dvbdmx->mutex);
 973                 return -ENODEV;
 974         }
 975
 976         ret = dvbdmx->stop_feed(dvbdmxfeed);
 977
 978         spin_lock_irq(&dvbdmx->lock);
 979         dvbdmxfeed->state = DMX_STATE_READY;
 980         feed->is_filtering = 0;
 981         spin_unlock_irq(&dvbdmx->lock);
 982
 983         mutex_unlock(&dvbdmx->mutex);
 984         return ret;
 985 }
 986
 987 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
 988                                            struct dmx_section_filter *filter)
 989 {
 990         struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
 991         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 992         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 993
 994         mutex_lock(&dvbdmx->mutex);
 995
 996         if (dvbdmxfilter->feed != dvbdmxfeed) {
 997                 mutex_unlock(&dvbdmx->mutex);
 998                 return -EINVAL;
 999         }
1000
1001         if (feed->is_filtering) {
1002                 /* release dvbdmx->mutex as far as it is
1003                    acquired by stop_filtering() itself */
1004                 mutex_unlock(&dvbdmx->mutex);
1005                 feed->stop_filtering(feed);
1006                 mutex_lock(&dvbdmx->mutex);
1007         }
1008
1009         spin_lock_irq(&dvbdmx->lock);
1010         f = dvbdmxfeed->filter;
1011
1012         if (f == dvbdmxfilter) {
1013                 dvbdmxfeed->filter = dvbdmxfilter->next;
1014         } else {
1015                 while (f->next != dvbdmxfilter)
1016                         f = f->next;
1017                 f->next = f->next->next;
1018         }
1019
1020         dvbdmxfilter->state = DMX_STATE_FREE;
1021         spin_unlock_irq(&dvbdmx->lock);
1022         mutex_unlock(&dvbdmx->mutex);
1023         return 0;
1024 }
1025
1026 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
1027                                         struct dmx_section_feed **feed,
1028                                         dmx_section_cb callback)
1029 {
1030         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1031         struct dvb_demux_feed *dvbdmxfeed;
1032
1033         if (mutex_lock_interruptible(&dvbdmx->mutex))
1034                 return -ERESTARTSYS;
1035
1036         if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
1037                 mutex_unlock(&dvbdmx->mutex);
1038                 return -EBUSY;
1039         }
1040
1041         dvbdmxfeed->type = DMX_TYPE_SEC;
1042         dvbdmxfeed->cb.sec = callback;
1043         dvbdmxfeed->demux = dvbdmx;
1044         dvbdmxfeed->pid = 0xffff;
1045         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
1046         dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
1047         dvbdmxfeed->feed.sec.tsfeedp = 0;
1048         dvbdmxfeed->filter = NULL;
1049
1050         (*feed) = &dvbdmxfeed->feed.sec;
1051         (*feed)->is_filtering = 0;
1052         (*feed)->parent = demux;
1053         (*feed)->priv = NULL;
1054
1055         (*feed)->set = dmx_section_feed_set;
1056         (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1057         (*feed)->start_filtering = dmx_section_feed_start_filtering;
1058         (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1059         (*feed)->release_filter = dmx_section_feed_release_filter;
1060
1061         mutex_unlock(&dvbdmx->mutex);
1062         return 0;
1063 }
1064
1065 static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1066                                        struct dmx_section_feed *feed)
1067 {
1068         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1069         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1070
1071         mutex_lock(&dvbdmx->mutex);
1072
1073         if (dvbdmxfeed->state == DMX_STATE_FREE) {
1074                 mutex_unlock(&dvbdmx->mutex);
1075                 return -EINVAL;
1076         }
1077         dvbdmxfeed->state = DMX_STATE_FREE;
1078
1079         dvb_demux_feed_del(dvbdmxfeed);
1080
1081         dvbdmxfeed->pid = 0xffff;
1082
1083         mutex_unlock(&dvbdmx->mutex);
1084         return 0;
1085 }
1086
1087 /******************************************************************************
1088  * dvb_demux kernel data API calls
1089  ******************************************************************************/
1090
1091 static int dvbdmx_open(struct dmx_demux *demux)
1092 {
1093         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1094
1095         if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1096                 return -EUSERS;
1097
1098         dvbdemux->users++;
1099         return 0;
1100 }
1101
1102 static int dvbdmx_close(struct dmx_demux *demux)
1103 {
1104         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1105
1106         if (dvbdemux->users == 0)
1107                 return -ENODEV;
1108
1109         dvbdemux->users--;
1110         //FIXME: release any unneeded resources if users==0
1111         return 0;
1112 }
1113
1114 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
1115 {
1116         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1117         void *p;
1118
1119         if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1120                 return -EINVAL;
1121
1122         p = memdup_user(buf, count);
1123         if (IS_ERR(p))
1124                 return PTR_ERR(p);
1125         if (mutex_lock_interruptible(&dvbdemux->mutex)) {
1126                 kfree(p);
1127                 return -ERESTARTSYS;
1128         }
1129         dvb_dmx_swfilter(dvbdemux, p, count);
1130         kfree(p);
1131         mutex_unlock(&dvbdemux->mutex);
1132
1133         if (signal_pending(current))
1134                 return -EINTR;
1135         return count;
1136 }
1137
1138 static int dvbdmx_add_frontend(struct dmx_demux *demux,
1139                                struct dmx_frontend *frontend)
1140 {
1141         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1142         struct list_head *head = &dvbdemux->frontend_list;
1143
1144         list_add(&(frontend->connectivity_list), head);
1145
1146         return 0;
1147 }
1148
1149 static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1150                                   struct dmx_frontend *frontend)
1151 {
1152         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1153         struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1154
1155         list_for_each_safe(pos, n, head) {
1156                 if (DMX_FE_ENTRY(pos) == frontend) {
1157                         list_del(pos);
1158                         return 0;
1159                 }
1160         }
1161
1162         return -ENODEV;
1163 }
1164
1165 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1166 {
1167         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1168
1169         if (list_empty(&dvbdemux->frontend_list))
1170                 return NULL;
1171
1172         return &dvbdemux->frontend_list;
1173 }
1174
1175 static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1176                                    struct dmx_frontend *frontend)
1177 {
1178         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1179
1180         if (demux->frontend)
1181                 return -EINVAL;
1182
1183         mutex_lock(&dvbdemux->mutex);
1184
1185         demux->frontend = frontend;
1186         mutex_unlock(&dvbdemux->mutex);
1187         return 0;
1188 }
1189
1190 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1191 {
1192         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1193
1194         mutex_lock(&dvbdemux->mutex);
1195
1196         demux->frontend = NULL;
1197         mutex_unlock(&dvbdemux->mutex);
1198         return 0;
1199 }
1200
1201 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1202 {
1203         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1204
1205         memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1206         return 0;
1207 }
1208
1209 int dvb_dmx_init(struct dvb_demux *dvbdemux)
1210 {
1211         int i;
1212         struct dmx_demux *dmx = &dvbdemux->dmx;
1213
1214         dvbdemux->cnt_storage = NULL;
1215         dvbdemux->users = 0;
1216         dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter));
1217
1218         if (!dvbdemux->filter)
1219                 return -ENOMEM;
1220
1221         dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed));
1222         if (!dvbdemux->feed) {
1223                 vfree(dvbdemux->filter);
1224                 dvbdemux->filter = NULL;
1225                 return -ENOMEM;
1226         }
1227         for (i = 0; i < dvbdemux->filternum; i++) {
1228                 dvbdemux->filter[i].state = DMX_STATE_FREE;
1229                 dvbdemux->filter[i].index = i;
1230         }
1231         for (i = 0; i < dvbdemux->feednum; i++) {
1232                 dvbdemux->feed[i].state = DMX_STATE_FREE;
1233                 dvbdemux->feed[i].index = i;
1234         }
1235
1236         dvbdemux->cnt_storage = vmalloc(MAX_PID + 1);
1237         if (!dvbdemux->cnt_storage)
1238                 pr_warn("Couldn't allocate memory for TS/TEI check. Disabling it\n");
1239
1240         INIT_LIST_HEAD(&dvbdemux->frontend_list);
1241
1242         for (i = 0; i < DMX_PES_OTHER; i++) {
1243                 dvbdemux->pesfilter[i] = NULL;
1244                 dvbdemux->pids[i] = 0xffff;
1245         }
1246
1247         INIT_LIST_HEAD(&dvbdemux->feed_list);
1248
1249         dvbdemux->playing = 0;
1250         dvbdemux->recording = 0;
1251         dvbdemux->tsbufp = 0;
1252
1253         if (!dvbdemux->check_crc32)
1254                 dvbdemux->check_crc32 = dvb_dmx_crc32;
1255
1256         if (!dvbdemux->memcopy)
1257                 dvbdemux->memcopy = dvb_dmx_memcopy;
1258
1259         dmx->frontend = NULL;
1260         dmx->priv = dvbdemux;
1261         dmx->open = dvbdmx_open;
1262         dmx->close = dvbdmx_close;
1263         dmx->write = dvbdmx_write;
1264         dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1265         dmx->release_ts_feed = dvbdmx_release_ts_feed;
1266         dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1267         dmx->release_section_feed = dvbdmx_release_section_feed;
1268
1269         dmx->add_frontend = dvbdmx_add_frontend;
1270         dmx->remove_frontend = dvbdmx_remove_frontend;
1271         dmx->get_frontends = dvbdmx_get_frontends;
1272         dmx->connect_frontend = dvbdmx_connect_frontend;
1273         dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1274         dmx->get_pes_pids = dvbdmx_get_pes_pids;
1275
1276         mutex_init(&dvbdemux->mutex);
1277         spin_lock_init(&dvbdemux->lock);
1278
1279         return 0;
1280 }
1281
1282 EXPORT_SYMBOL(dvb_dmx_init);
1283
1284 void dvb_dmx_release(struct dvb_demux *dvbdemux)
1285 {
1286         vfree(dvbdemux->cnt_storage);
1287         vfree(dvbdemux->filter);
1288         vfree(dvbdemux->feed);
1289 }
1290
1291 EXPORT_SYMBOL(dvb_dmx_release);