drivers/media/dvb-core/dvb_demux.c

   1 /*
   2  * dvb_demux.c - DVB kernel demux API
   3  *
   4  * Copyright (C) 2000-2001 Ralph  Metzler <ralph@convergence.de>
   5  *                     & Marcus Metzler <marcus@convergence.de>
   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 "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!\n");
 123 #endif
 124
 125         if (buf[1] & 0x40)      // PUSI ?
 126                 feed->peslen = 0xfffa;
 127
 128         feed->peslen += count;
 129
 130         return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts);
 131 }
 132
 133 static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed,
 134                                           struct dvb_demux_filter *f)
 135 {
 136         u8 neq = 0;
 137         int i;
 138
 139         for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 140                 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
 141
 142                 if (f->maskandmode[i] & xor)
 143                         return 0;
 144
 145                 neq |= f->maskandnotmode[i] & xor;
 146         }
 147
 148         if (f->doneq && !neq)
 149                 return 0;
 150
 151         return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen,
 152                             NULL, 0, &f->filter);
 153 }
 154
 155 static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed)
 156 {
 157         struct dvb_demux *demux = feed->demux;
 158         struct dvb_demux_filter *f = feed->filter;
 159         struct dmx_section_feed *sec = &feed->feed.sec;
 160         int section_syntax_indicator;
 161
 162         if (!sec->is_filtering)
 163                 return 0;
 164
 165         if (!f)
 166                 return 0;
 167
 168         if (sec->check_crc) {
 169                 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
 170                 if (section_syntax_indicator &&
 171                     demux->check_crc32(feed, sec->secbuf, sec->seclen))
 172                         return -1;
 173         }
 174
 175         do {
 176                 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)
 177                         return -1;
 178         } while ((f = f->next) && sec->is_filtering);
 179
 180         sec->seclen = 0;
 181
 182         return 0;
 183 }
 184
 185 static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
 186 {
 187         struct dmx_section_feed *sec = &feed->feed.sec;
 188
 189 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 190         if (sec->secbufp < sec->tsfeedp) {
 191                 int i, n = sec->tsfeedp - sec->secbufp;
 192
 193                 /*
 194                  * Section padding is done with 0xff bytes entirely.
 195                  * Due to speed reasons, we won't check all of them
 196                  * but just first and last.
 197                  */
 198                 if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) {
 199                         dprintk("dvb_demux.c section ts padding loss: %d/%d\n",
 200                                n, sec->tsfeedp);
 201                         dprintk("dvb_demux.c pad data:");
 202                         for (i = 0; i < n; i++)
 203                                 pr_cont(" %02x", sec->secbuf[i]);
 204                         pr_cont("\n");
 205                 }
 206         }
 207 #endif
 208
 209         sec->tsfeedp = sec->secbufp = sec->seclen = 0;
 210         sec->secbuf = sec->secbuf_base;
 211 }
 212
 213 /*
 214  * Losless Section Demux 1.4.1 by Emard
 215  * Valsecchi Patrick:
 216  *  - middle of section A  (no PUSI)
 217  *  - end of section A and start of section B
 218  *    (with PUSI pointing to the start of the second section)
 219  *
 220  *  In this case, without feed->pusi_seen you'll receive a garbage section
 221  *  consisting of the end of section A. Basically because tsfeedp
 222  *  is incemented and the use=0 condition is not raised
 223  *  when the second packet arrives.
 224  *
 225  * Fix:
 226  * when demux is started, let feed->pusi_seen = false to
 227  * prevent initial feeding of garbage from the end of
 228  * previous section. When you for the first time see PUSI=1
 229  * then set feed->pusi_seen = true
 230  */
 231 static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed,
 232                                               const u8 *buf, u8 len)
 233 {
 234         struct dvb_demux *demux = feed->demux;
 235         struct dmx_section_feed *sec = &feed->feed.sec;
 236         u16 limit, seclen, n;
 237
 238         if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
 239                 return 0;
 240
 241         if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
 242 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 243                 dprintk("dvb_demux.c section buffer full loss: %d/%d\n",
 244                        sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,
 245                        DMX_MAX_SECFEED_SIZE);
 246 #endif
 247                 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
 248         }
 249
 250         if (len <= 0)
 251                 return 0;
 252
 253         demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
 254         sec->tsfeedp += len;
 255
 256         /*
 257          * Dump all the sections we can find in the data (Emard)
 258          */
 259         limit = sec->tsfeedp;
 260         if (limit > DMX_MAX_SECFEED_SIZE)
 261                 return -1;      /* internal error should never happen */
 262
 263         /* to be sure always set secbuf */
 264         sec->secbuf = sec->secbuf_base + sec->secbufp;
 265
 266         for (n = 0; sec->secbufp + 2 < limit; n++) {
 267                 seclen = section_length(sec->secbuf);
 268                 if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE
 269                     || seclen + sec->secbufp > limit)
 270                         return 0;
 271                 sec->seclen = seclen;
 272                 sec->crc_val = ~0;
 273                 /* dump [secbuf .. secbuf+seclen) */
 274                 if (feed->pusi_seen)
 275                         dvb_dmx_swfilter_section_feed(feed);
 276 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 277                 else
 278                         dprintk("dvb_demux.c pusi not seen, discarding section data\n");
 279 #endif
 280                 sec->secbufp += seclen; /* secbufp and secbuf moving together is */
 281                 sec->secbuf += seclen;  /* redundant but saves pointer arithmetic */
 282         }
 283
 284         return 0;
 285 }
 286
 287 static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,
 288                                            const u8 *buf)
 289 {
 290         u8 p, count;
 291         int ccok, dc_i = 0;
 292         u8 cc;
 293
 294         count = payload(buf);
 295
 296         if (count == 0)         /* count == 0 if no payload or out of range */
 297                 return -1;
 298
 299         p = 188 - count;        /* payload start */
 300
 301         cc = buf[3] & 0x0f;
 302         ccok = ((feed->cc + 1) & 0x0f) == cc;
 303         feed->cc = cc;
 304
 305         if (buf[3] & 0x20) {
 306                 /* adaption field present, check for discontinuity_indicator */
 307                 if ((buf[4] > 0) && (buf[5] & 0x80))
 308                         dc_i = 1;
 309         }
 310
 311         if (!ccok || dc_i) {
 312 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 313                 dprintk("dvb_demux.c discontinuity detected %d bytes lost\n",
 314                         count);
 315                 /*
 316                  * those bytes under sume circumstances will again be reported
 317                  * in the following dvb_dmx_swfilter_section_new
 318                  */
 319 #endif
 320                 /*
 321                  * Discontinuity detected. Reset pusi_seen to
 322                  * stop feeding of suspicious data until next PUSI=1 arrives
 323                  */
 324                 feed->pusi_seen = false;
 325                 dvb_dmx_swfilter_section_new(feed);
 326         }
 327
 328         if (buf[1] & 0x40) {
 329                 /* PUSI=1 (is set), section boundary is here */
 330                 if (count > 1 && buf[p] < count) {
 331                         const u8 *before = &buf[p + 1];
 332                         u8 before_len = buf[p];
 333                         const u8 *after = &before[before_len];
 334                         u8 after_len = count - 1 - before_len;
 335
 336                         dvb_dmx_swfilter_section_copy_dump(feed, before,
 337                                                            before_len);
 338                         /* before start of new section, set pusi_seen */
 339                         feed->pusi_seen = true;
 340                         dvb_dmx_swfilter_section_new(feed);
 341                         dvb_dmx_swfilter_section_copy_dump(feed, after,
 342                                                            after_len);
 343                 }
 344 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 345                 else if (count > 0)
 346                         dprintk("dvb_demux.c PUSI=1 but %d bytes lost\n",
 347                                 count);
 348 #endif
 349         } else {
 350                 /* PUSI=0 (is not set), no section boundary */
 351                 dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count);
 352         }
 353
 354         return 0;
 355 }
 356
 357 static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed,
 358                                                 const u8 *buf)
 359 {
 360         switch (feed->type) {
 361         case DMX_TYPE_TS:
 362                 if (!feed->feed.ts.is_filtering)
 363                         break;
 364                 if (feed->ts_type & TS_PACKET) {
 365                         if (feed->ts_type & TS_PAYLOAD_ONLY)
 366                                 dvb_dmx_swfilter_payload(feed, buf);
 367                         else
 368                                 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts);
 369                 }
 370                 /* Used only on full-featured devices */
 371                 if (feed->ts_type & TS_DECODER)
 372                         if (feed->demux->write_to_decoder)
 373                                 feed->demux->write_to_decoder(feed, buf, 188);
 374                 break;
 375
 376         case DMX_TYPE_SEC:
 377                 if (!feed->feed.sec.is_filtering)
 378                         break;
 379                 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
 380                         feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
 381                 break;
 382
 383         default:
 384                 break;
 385         }
 386 }
 387
 388 #define DVR_FEED(f)                                                     \
 389         (((f)->type == DMX_TYPE_TS) &&                                  \
 390         ((f)->feed.ts.is_filtering) &&                                  \
 391         (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))
 392
 393 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
 394 {
 395         struct dvb_demux_feed *feed;
 396         u16 pid = ts_pid(buf);
 397         int dvr_done = 0;
 398
 399         if (dvb_demux_speedcheck) {
 400                 ktime_t cur_time;
 401                 u64 speed_bytes, speed_timedelta;
 402
 403                 demux->speed_pkts_cnt++;
 404
 405                 /* show speed every SPEED_PKTS_INTERVAL packets */
 406                 if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) {
 407                         cur_time = ktime_get();
 408
 409                         if (ktime_to_ns(demux->speed_last_time) != 0) {
 410                                 speed_bytes = (u64)demux->speed_pkts_cnt
 411                                         * 188 * 8;
 412                                 /* convert to 1024 basis */
 413                                 speed_bytes = 1000 * div64_u64(speed_bytes,
 414                                                 1024);
 415                                 speed_timedelta = ktime_ms_delta(cur_time,
 416                                                         demux->speed_last_time);
 417                                 dprintk("TS speed %llu Kbits/sec \n",
 418                                         div64_u64(speed_bytes,
 419                                                   speed_timedelta));
 420                         }
 421
 422                         demux->speed_last_time = cur_time;
 423                         demux->speed_pkts_cnt = 0;
 424                 }
 425         }
 426
 427         if (buf[1] & 0x80) {
 428                 dprintk_tscheck("TEI detected. PID=0x%x data1=0x%x\n",
 429                                 pid, buf[1]);
 430                 /* data in this packet can't be trusted - drop it unless
 431                  * module option dvb_demux_feed_err_pkts is set */
 432                 if (!dvb_demux_feed_err_pkts)
 433                         return;
 434         } else /* if TEI bit is set, pid may be wrong- skip pkt counter */
 435                 if (demux->cnt_storage && dvb_demux_tscheck) {
 436                         /* check pkt counter */
 437                         if (pid < MAX_PID) {
 438                                 if (buf[3] & 0x10)
 439                                         demux->cnt_storage[pid] =
 440                                                 (demux->cnt_storage[pid] + 1) & 0xf;
 441
 442                                 if ((buf[3] & 0xf) != demux->cnt_storage[pid]) {
 443                                         dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n",
 444                                                 pid, demux->cnt_storage[pid],
 445                                                 buf[3] & 0xf);
 446                                         demux->cnt_storage[pid] = buf[3] & 0xf;
 447                                 }
 448                         }
 449                         /* end check */
 450                 }
 451
 452         list_for_each_entry(feed, &demux->feed_list, list_head) {
 453                 if ((feed->pid != pid) && (feed->pid != 0x2000))
 454                         continue;
 455
 456                 /* copy each packet only once to the dvr device, even
 457                  * if a PID is in multiple filters (e.g. video + PCR) */
 458                 if ((DVR_FEED(feed)) && (dvr_done++))
 459                         continue;
 460
 461                 if (feed->pid == pid)
 462                         dvb_dmx_swfilter_packet_type(feed, buf);
 463                 else if (feed->pid == 0x2000)
 464                         feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts);
 465         }
 466 }
 467
 468 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
 469                               size_t count)
 470 {
 471         unsigned long flags;
 472
 473         spin_lock_irqsave(&demux->lock, flags);
 474
 475         while (count--) {
 476                 if (buf[0] == 0x47)
 477                         dvb_dmx_swfilter_packet(demux, buf);
 478                 buf += 188;
 479         }
 480
 481         spin_unlock_irqrestore(&demux->lock, flags);
 482 }
 483
 484 EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
 485
 486 static inline int find_next_packet(const u8 *buf, int pos, size_t count,
 487                                    const int pktsize)
 488 {
 489         int start = pos, lost;
 490
 491         while (pos < count) {
 492                 if (buf[pos] == 0x47 ||
 493                     (pktsize == 204 && buf[pos] == 0xB8))
 494                         break;
 495                 pos++;
 496         }
 497
 498         lost = pos - start;
 499         if (lost) {
 500                 /* This garbage is part of a valid packet? */
 501                 int backtrack = pos - pktsize;
 502                 if (backtrack >= 0 && (buf[backtrack] == 0x47 ||
 503                     (pktsize == 204 && buf[backtrack] == 0xB8)))
 504                         return backtrack;
 505         }
 506
 507         return pos;
 508 }
 509
 510 /* Filter all pktsize= 188 or 204 sized packets and skip garbage. */
 511 static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf,
 512                 size_t count, const int pktsize)
 513 {
 514         int p = 0, i, j;
 515         const u8 *q;
 516         unsigned long flags;
 517
 518         spin_lock_irqsave(&demux->lock, flags);
 519
 520         if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */
 521                 i = demux->tsbufp;
 522                 j = pktsize - i;
 523                 if (count < j) {
 524                         memcpy(&demux->tsbuf[i], buf, count);
 525                         demux->tsbufp += count;
 526                         goto bailout;
 527                 }
 528                 memcpy(&demux->tsbuf[i], buf, j);
 529                 if (demux->tsbuf[0] == 0x47) /* double check */
 530                         dvb_dmx_swfilter_packet(demux, demux->tsbuf);
 531                 demux->tsbufp = 0;
 532                 p += j;
 533         }
 534
 535         while (1) {
 536                 p = find_next_packet(buf, p, count, pktsize);
 537                 if (p >= count)
 538                         break;
 539                 if (count - p < pktsize)
 540                         break;
 541
 542                 q = &buf[p];
 543
 544                 if (pktsize == 204 && (*q == 0xB8)) {
 545                         memcpy(demux->tsbuf, q, 188);
 546                         demux->tsbuf[0] = 0x47;
 547                         q = demux->tsbuf;
 548                 }
 549                 dvb_dmx_swfilter_packet(demux, q);
 550                 p += pktsize;
 551         }
 552
 553         i = count - p;
 554         if (i) {
 555                 memcpy(demux->tsbuf, &buf[p], i);
 556                 demux->tsbufp = i;
 557                 if (pktsize == 204 && demux->tsbuf[0] == 0xB8)
 558                         demux->tsbuf[0] = 0x47;
 559         }
 560
 561 bailout:
 562         spin_unlock_irqrestore(&demux->lock, flags);
 563 }
 564
 565 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
 566 {
 567         _dvb_dmx_swfilter(demux, buf, count, 188);
 568 }
 569 EXPORT_SYMBOL(dvb_dmx_swfilter);
 570
 571 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
 572 {
 573         _dvb_dmx_swfilter(demux, buf, count, 204);
 574 }
 575 EXPORT_SYMBOL(dvb_dmx_swfilter_204);
 576
 577 void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count)
 578 {
 579         unsigned long flags;
 580
 581         spin_lock_irqsave(&demux->lock, flags);
 582
 583         demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts);
 584
 585         spin_unlock_irqrestore(&demux->lock, flags);
 586 }
 587 EXPORT_SYMBOL(dvb_dmx_swfilter_raw);
 588
 589 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
 590 {
 591         int i;
 592
 593         for (i = 0; i < demux->filternum; i++)
 594                 if (demux->filter[i].state == DMX_STATE_FREE)
 595                         break;
 596
 597         if (i == demux->filternum)
 598                 return NULL;
 599
 600         demux->filter[i].state = DMX_STATE_ALLOCATED;
 601
 602         return &demux->filter[i];
 603 }
 604
 605 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
 606 {
 607         int i;
 608
 609         for (i = 0; i < demux->feednum; i++)
 610                 if (demux->feed[i].state == DMX_STATE_FREE)
 611                         break;
 612
 613         if (i == demux->feednum)
 614                 return NULL;
 615
 616         demux->feed[i].state = DMX_STATE_ALLOCATED;
 617
 618         return &demux->feed[i];
 619 }
 620
 621 static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
 622 {
 623         struct dvb_demux_feed *entry;
 624
 625         list_for_each_entry(entry, &feed->demux->feed_list, list_head)
 626                 if (entry == feed)
 627                         return 1;
 628
 629         return 0;
 630 }
 631
 632 static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
 633 {
 634         spin_lock_irq(&feed->demux->lock);
 635         if (dvb_demux_feed_find(feed)) {
 636                 pr_err("%s: feed already in list (type=%x state=%x pid=%x)\n",
 637                        __func__, feed->type, feed->state, feed->pid);
 638                 goto out;
 639         }
 640
 641         list_add(&feed->list_head, &feed->demux->feed_list);
 642 out:
 643         spin_unlock_irq(&feed->demux->lock);
 644 }
 645
 646 static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
 647 {
 648         spin_lock_irq(&feed->demux->lock);
 649         if (!(dvb_demux_feed_find(feed))) {
 650                 pr_err("%s: feed not in list (type=%x state=%x pid=%x)\n",
 651                        __func__, feed->type, feed->state, feed->pid);
 652                 goto out;
 653         }
 654
 655         list_del(&feed->list_head);
 656 out:
 657         spin_unlock_irq(&feed->demux->lock);
 658 }
 659
 660 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
 661                            enum dmx_ts_pes pes_type, ktime_t timeout)
 662 {
 663         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 664         struct dvb_demux *demux = feed->demux;
 665
 666         if (pid > DMX_MAX_PID)
 667                 return -EINVAL;
 668
 669         if (mutex_lock_interruptible(&demux->mutex))
 670                 return -ERESTARTSYS;
 671
 672         if (ts_type & TS_DECODER) {
 673                 if (pes_type >= DMX_PES_OTHER) {
 674                         mutex_unlock(&demux->mutex);
 675                         return -EINVAL;
 676                 }
 677
 678                 if (demux->pesfilter[pes_type] &&
 679                     demux->pesfilter[pes_type] != feed) {
 680                         mutex_unlock(&demux->mutex);
 681                         return -EINVAL;
 682                 }
 683
 684                 demux->pesfilter[pes_type] = feed;
 685                 demux->pids[pes_type] = pid;
 686         }
 687
 688         dvb_demux_feed_add(feed);
 689
 690         feed->pid = pid;
 691         feed->timeout = timeout;
 692         feed->ts_type = ts_type;
 693         feed->pes_type = pes_type;
 694
 695         feed->state = DMX_STATE_READY;
 696         mutex_unlock(&demux->mutex);
 697
 698         return 0;
 699 }
 700
 701 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
 702 {
 703         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 704         struct dvb_demux *demux = feed->demux;
 705         int ret;
 706
 707         if (mutex_lock_interruptible(&demux->mutex))
 708                 return -ERESTARTSYS;
 709
 710         if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
 711                 mutex_unlock(&demux->mutex);
 712                 return -EINVAL;
 713         }
 714
 715         if (!demux->start_feed) {
 716                 mutex_unlock(&demux->mutex);
 717                 return -ENODEV;
 718         }
 719
 720         if ((ret = demux->start_feed(feed)) < 0) {
 721                 mutex_unlock(&demux->mutex);
 722                 return ret;
 723         }
 724
 725         spin_lock_irq(&demux->lock);
 726         ts_feed->is_filtering = 1;
 727         feed->state = DMX_STATE_GO;
 728         spin_unlock_irq(&demux->lock);
 729         mutex_unlock(&demux->mutex);
 730
 731         return 0;
 732 }
 733
 734 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
 735 {
 736         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 737         struct dvb_demux *demux = feed->demux;
 738         int ret;
 739
 740         mutex_lock(&demux->mutex);
 741
 742         if (feed->state < DMX_STATE_GO) {
 743                 mutex_unlock(&demux->mutex);
 744                 return -EINVAL;
 745         }
 746
 747         if (!demux->stop_feed) {
 748                 mutex_unlock(&demux->mutex);
 749                 return -ENODEV;
 750         }
 751
 752         ret = demux->stop_feed(feed);
 753
 754         spin_lock_irq(&demux->lock);
 755         ts_feed->is_filtering = 0;
 756         feed->state = DMX_STATE_ALLOCATED;
 757         spin_unlock_irq(&demux->lock);
 758         mutex_unlock(&demux->mutex);
 759
 760         return ret;
 761 }
 762
 763 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
 764                                    struct dmx_ts_feed **ts_feed,
 765                                    dmx_ts_cb callback)
 766 {
 767         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 768         struct dvb_demux_feed *feed;
 769
 770         if (mutex_lock_interruptible(&demux->mutex))
 771                 return -ERESTARTSYS;
 772
 773         if (!(feed = dvb_dmx_feed_alloc(demux))) {
 774                 mutex_unlock(&demux->mutex);
 775                 return -EBUSY;
 776         }
 777
 778         feed->type = DMX_TYPE_TS;
 779         feed->cb.ts = callback;
 780         feed->demux = demux;
 781         feed->pid = 0xffff;
 782         feed->peslen = 0xfffa;
 783
 784         (*ts_feed) = &feed->feed.ts;
 785         (*ts_feed)->parent = dmx;
 786         (*ts_feed)->priv = NULL;
 787         (*ts_feed)->is_filtering = 0;
 788         (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
 789         (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
 790         (*ts_feed)->set = dmx_ts_feed_set;
 791
 792         if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
 793                 feed->state = DMX_STATE_FREE;
 794                 mutex_unlock(&demux->mutex);
 795                 return -EBUSY;
 796         }
 797
 798         feed->filter->type = DMX_TYPE_TS;
 799         feed->filter->feed = feed;
 800         feed->filter->state = DMX_STATE_READY;
 801
 802         mutex_unlock(&demux->mutex);
 803
 804         return 0;
 805 }
 806
 807 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
 808                                   struct dmx_ts_feed *ts_feed)
 809 {
 810         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 811         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 812
 813         mutex_lock(&demux->mutex);
 814
 815         if (feed->state == DMX_STATE_FREE) {
 816                 mutex_unlock(&demux->mutex);
 817                 return -EINVAL;
 818         }
 819
 820         feed->state = DMX_STATE_FREE;
 821         feed->filter->state = DMX_STATE_FREE;
 822
 823         dvb_demux_feed_del(feed);
 824
 825         feed->pid = 0xffff;
 826
 827         if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER)
 828                 demux->pesfilter[feed->pes_type] = NULL;
 829
 830         mutex_unlock(&demux->mutex);
 831         return 0;
 832 }
 833
 834 /******************************************************************************
 835  * dmx_section_feed API calls
 836  ******************************************************************************/
 837
 838 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
 839                                             struct dmx_section_filter **filter)
 840 {
 841         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 842         struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
 843         struct dvb_demux_filter *dvbdmxfilter;
 844
 845         if (mutex_lock_interruptible(&dvbdemux->mutex))
 846                 return -ERESTARTSYS;
 847
 848         dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
 849         if (!dvbdmxfilter) {
 850                 mutex_unlock(&dvbdemux->mutex);
 851                 return -EBUSY;
 852         }
 853
 854         spin_lock_irq(&dvbdemux->lock);
 855         *filter = &dvbdmxfilter->filter;
 856         (*filter)->parent = feed;
 857         (*filter)->priv = NULL;
 858         dvbdmxfilter->feed = dvbdmxfeed;
 859         dvbdmxfilter->type = DMX_TYPE_SEC;
 860         dvbdmxfilter->state = DMX_STATE_READY;
 861         dvbdmxfilter->next = dvbdmxfeed->filter;
 862         dvbdmxfeed->filter = dvbdmxfilter;
 863         spin_unlock_irq(&dvbdemux->lock);
 864
 865         mutex_unlock(&dvbdemux->mutex);
 866         return 0;
 867 }
 868
 869 static int dmx_section_feed_set(struct dmx_section_feed *feed,
 870                                 u16 pid, int check_crc)
 871 {
 872         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 873         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 874
 875         if (pid > 0x1fff)
 876                 return -EINVAL;
 877
 878         if (mutex_lock_interruptible(&dvbdmx->mutex))
 879                 return -ERESTARTSYS;
 880
 881         dvb_demux_feed_add(dvbdmxfeed);
 882
 883         dvbdmxfeed->pid = pid;
 884         dvbdmxfeed->feed.sec.check_crc = check_crc;
 885
 886         dvbdmxfeed->state = DMX_STATE_READY;
 887         mutex_unlock(&dvbdmx->mutex);
 888         return 0;
 889 }
 890
 891 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
 892 {
 893         int i;
 894         struct dvb_demux_filter *f;
 895         struct dmx_section_filter *sf;
 896         u8 mask, mode, doneq;
 897
 898         if (!(f = dvbdmxfeed->filter))
 899                 return;
 900         do {
 901                 sf = &f->filter;
 902                 doneq = false;
 903                 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 904                         mode = sf->filter_mode[i];
 905                         mask = sf->filter_mask[i];
 906                         f->maskandmode[i] = mask & mode;
 907                         doneq |= f->maskandnotmode[i] = mask & ~mode;
 908                 }
 909                 f->doneq = doneq ? true : false;
 910         } while ((f = f->next));
 911 }
 912
 913 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
 914 {
 915         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 916         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 917         int ret;
 918
 919         if (mutex_lock_interruptible(&dvbdmx->mutex))
 920                 return -ERESTARTSYS;
 921
 922         if (feed->is_filtering) {
 923                 mutex_unlock(&dvbdmx->mutex);
 924                 return -EBUSY;
 925         }
 926
 927         if (!dvbdmxfeed->filter) {
 928                 mutex_unlock(&dvbdmx->mutex);
 929                 return -EINVAL;
 930         }
 931
 932         dvbdmxfeed->feed.sec.tsfeedp = 0;
 933         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
 934         dvbdmxfeed->feed.sec.secbufp = 0;
 935         dvbdmxfeed->feed.sec.seclen = 0;
 936
 937         if (!dvbdmx->start_feed) {
 938                 mutex_unlock(&dvbdmx->mutex);
 939                 return -ENODEV;
 940         }
 941
 942         prepare_secfilters(dvbdmxfeed);
 943
 944         if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
 945                 mutex_unlock(&dvbdmx->mutex);
 946                 return ret;
 947         }
 948
 949         spin_lock_irq(&dvbdmx->lock);
 950         feed->is_filtering = 1;
 951         dvbdmxfeed->state = DMX_STATE_GO;
 952         spin_unlock_irq(&dvbdmx->lock);
 953
 954         mutex_unlock(&dvbdmx->mutex);
 955         return 0;
 956 }
 957
 958 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
 959 {
 960         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 961         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 962         int ret;
 963
 964         mutex_lock(&dvbdmx->mutex);
 965
 966         if (!dvbdmx->stop_feed) {
 967                 mutex_unlock(&dvbdmx->mutex);
 968                 return -ENODEV;
 969         }
 970
 971         ret = dvbdmx->stop_feed(dvbdmxfeed);
 972
 973         spin_lock_irq(&dvbdmx->lock);
 974         dvbdmxfeed->state = DMX_STATE_READY;
 975         feed->is_filtering = 0;
 976         spin_unlock_irq(&dvbdmx->lock);
 977
 978         mutex_unlock(&dvbdmx->mutex);
 979         return ret;
 980 }
 981
 982 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
 983                                            struct dmx_section_filter *filter)
 984 {
 985         struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
 986         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 987         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 988
 989         mutex_lock(&dvbdmx->mutex);
 990
 991         if (dvbdmxfilter->feed != dvbdmxfeed) {
 992                 mutex_unlock(&dvbdmx->mutex);
 993                 return -EINVAL;
 994         }
 995
 996         if (feed->is_filtering) {
 997                 /* release dvbdmx->mutex as far as it is
 998                    acquired by stop_filtering() itself */
 999                 mutex_unlock(&dvbdmx->mutex);
1000                 feed->stop_filtering(feed);
1001                 mutex_lock(&dvbdmx->mutex);
1002         }
1003
1004         spin_lock_irq(&dvbdmx->lock);
1005         f = dvbdmxfeed->filter;
1006
1007         if (f == dvbdmxfilter) {
1008                 dvbdmxfeed->filter = dvbdmxfilter->next;
1009         } else {
1010                 while (f->next != dvbdmxfilter)
1011                         f = f->next;
1012                 f->next = f->next->next;
1013         }
1014
1015         dvbdmxfilter->state = DMX_STATE_FREE;
1016         spin_unlock_irq(&dvbdmx->lock);
1017         mutex_unlock(&dvbdmx->mutex);
1018         return 0;
1019 }
1020
1021 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
1022                                         struct dmx_section_feed **feed,
1023                                         dmx_section_cb callback)
1024 {
1025         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1026         struct dvb_demux_feed *dvbdmxfeed;
1027
1028         if (mutex_lock_interruptible(&dvbdmx->mutex))
1029                 return -ERESTARTSYS;
1030
1031         if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
1032                 mutex_unlock(&dvbdmx->mutex);
1033                 return -EBUSY;
1034         }
1035
1036         dvbdmxfeed->type = DMX_TYPE_SEC;
1037         dvbdmxfeed->cb.sec = callback;
1038         dvbdmxfeed->demux = dvbdmx;
1039         dvbdmxfeed->pid = 0xffff;
1040         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
1041         dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
1042         dvbdmxfeed->feed.sec.tsfeedp = 0;
1043         dvbdmxfeed->filter = NULL;
1044
1045         (*feed) = &dvbdmxfeed->feed.sec;
1046         (*feed)->is_filtering = 0;
1047         (*feed)->parent = demux;
1048         (*feed)->priv = NULL;
1049
1050         (*feed)->set = dmx_section_feed_set;
1051         (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1052         (*feed)->start_filtering = dmx_section_feed_start_filtering;
1053         (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1054         (*feed)->release_filter = dmx_section_feed_release_filter;
1055
1056         mutex_unlock(&dvbdmx->mutex);
1057         return 0;
1058 }
1059
1060 static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1061                                        struct dmx_section_feed *feed)
1062 {
1063         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1064         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1065
1066         mutex_lock(&dvbdmx->mutex);
1067
1068         if (dvbdmxfeed->state == DMX_STATE_FREE) {
1069                 mutex_unlock(&dvbdmx->mutex);
1070                 return -EINVAL;
1071         }
1072         dvbdmxfeed->state = DMX_STATE_FREE;
1073
1074         dvb_demux_feed_del(dvbdmxfeed);
1075
1076         dvbdmxfeed->pid = 0xffff;
1077
1078         mutex_unlock(&dvbdmx->mutex);
1079         return 0;
1080 }
1081
1082 /******************************************************************************
1083  * dvb_demux kernel data API calls
1084  ******************************************************************************/
1085
1086 static int dvbdmx_open(struct dmx_demux *demux)
1087 {
1088         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1089
1090         if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1091                 return -EUSERS;
1092
1093         dvbdemux->users++;
1094         return 0;
1095 }
1096
1097 static int dvbdmx_close(struct dmx_demux *demux)
1098 {
1099         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1100
1101         if (dvbdemux->users == 0)
1102                 return -ENODEV;
1103
1104         dvbdemux->users--;
1105         //FIXME: release any unneeded resources if users==0
1106         return 0;
1107 }
1108
1109 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
1110 {
1111         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1112         void *p;
1113
1114         if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1115                 return -EINVAL;
1116
1117         p = memdup_user(buf, count);
1118         if (IS_ERR(p))
1119                 return PTR_ERR(p);
1120         if (mutex_lock_interruptible(&dvbdemux->mutex)) {
1121                 kfree(p);
1122                 return -ERESTARTSYS;
1123         }
1124         dvb_dmx_swfilter(dvbdemux, p, count);
1125         kfree(p);
1126         mutex_unlock(&dvbdemux->mutex);
1127
1128         if (signal_pending(current))
1129                 return -EINTR;
1130         return count;
1131 }
1132
1133 static int dvbdmx_add_frontend(struct dmx_demux *demux,
1134                                struct dmx_frontend *frontend)
1135 {
1136         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1137         struct list_head *head = &dvbdemux->frontend_list;
1138
1139         list_add(&(frontend->connectivity_list), head);
1140
1141         return 0;
1142 }
1143
1144 static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1145                                   struct dmx_frontend *frontend)
1146 {
1147         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1148         struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1149
1150         list_for_each_safe(pos, n, head) {
1151                 if (DMX_FE_ENTRY(pos) == frontend) {
1152                         list_del(pos);
1153                         return 0;
1154                 }
1155         }
1156
1157         return -ENODEV;
1158 }
1159
1160 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1161 {
1162         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1163
1164         if (list_empty(&dvbdemux->frontend_list))
1165                 return NULL;
1166
1167         return &dvbdemux->frontend_list;
1168 }
1169
1170 static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1171                                    struct dmx_frontend *frontend)
1172 {
1173         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1174
1175         if (demux->frontend)
1176                 return -EINVAL;
1177
1178         mutex_lock(&dvbdemux->mutex);
1179
1180         demux->frontend = frontend;
1181         mutex_unlock(&dvbdemux->mutex);
1182         return 0;
1183 }
1184
1185 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1186 {
1187         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1188
1189         mutex_lock(&dvbdemux->mutex);
1190
1191         demux->frontend = NULL;
1192         mutex_unlock(&dvbdemux->mutex);
1193         return 0;
1194 }
1195
1196 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1197 {
1198         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1199
1200         memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1201         return 0;
1202 }
1203
1204 int dvb_dmx_init(struct dvb_demux *dvbdemux)
1205 {
1206         int i;
1207         struct dmx_demux *dmx = &dvbdemux->dmx;
1208
1209         dvbdemux->cnt_storage = NULL;
1210         dvbdemux->users = 0;
1211         dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter));
1212
1213         if (!dvbdemux->filter)
1214                 return -ENOMEM;
1215
1216         dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed));
1217         if (!dvbdemux->feed) {
1218                 vfree(dvbdemux->filter);
1219                 dvbdemux->filter = NULL;
1220                 return -ENOMEM;
1221         }
1222         for (i = 0; i < dvbdemux->filternum; i++) {
1223                 dvbdemux->filter[i].state = DMX_STATE_FREE;
1224                 dvbdemux->filter[i].index = i;
1225         }
1226         for (i = 0; i < dvbdemux->feednum; i++) {
1227                 dvbdemux->feed[i].state = DMX_STATE_FREE;
1228                 dvbdemux->feed[i].index = i;
1229         }
1230
1231         dvbdemux->cnt_storage = vmalloc(MAX_PID + 1);
1232         if (!dvbdemux->cnt_storage)
1233                 pr_warn("Couldn't allocate memory for TS/TEI check. Disabling it\n");
1234
1235         INIT_LIST_HEAD(&dvbdemux->frontend_list);
1236
1237         for (i = 0; i < DMX_PES_OTHER; i++) {
1238                 dvbdemux->pesfilter[i] = NULL;
1239                 dvbdemux->pids[i] = 0xffff;
1240         }
1241
1242         INIT_LIST_HEAD(&dvbdemux->feed_list);
1243
1244         dvbdemux->playing = 0;
1245         dvbdemux->recording = 0;
1246         dvbdemux->tsbufp = 0;
1247
1248         if (!dvbdemux->check_crc32)
1249                 dvbdemux->check_crc32 = dvb_dmx_crc32;
1250
1251         if (!dvbdemux->memcopy)
1252                 dvbdemux->memcopy = dvb_dmx_memcopy;
1253
1254         dmx->frontend = NULL;
1255         dmx->priv = dvbdemux;
1256         dmx->open = dvbdmx_open;
1257         dmx->close = dvbdmx_close;
1258         dmx->write = dvbdmx_write;
1259         dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1260         dmx->release_ts_feed = dvbdmx_release_ts_feed;
1261         dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1262         dmx->release_section_feed = dvbdmx_release_section_feed;
1263
1264         dmx->add_frontend = dvbdmx_add_frontend;
1265         dmx->remove_frontend = dvbdmx_remove_frontend;
1266         dmx->get_frontends = dvbdmx_get_frontends;
1267         dmx->connect_frontend = dvbdmx_connect_frontend;
1268         dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1269         dmx->get_pes_pids = dvbdmx_get_pes_pids;
1270
1271         mutex_init(&dvbdemux->mutex);
1272         spin_lock_init(&dvbdemux->lock);
1273
1274         return 0;
1275 }
1276
1277 EXPORT_SYMBOL(dvb_dmx_init);
1278
1279 void dvb_dmx_release(struct dvb_demux *dvbdemux)
1280 {
1281         vfree(dvbdemux->cnt_storage);
1282         vfree(dvbdemux->filter);
1283         vfree(dvbdemux->feed);
1284 }
1285
1286 EXPORT_SYMBOL(dvb_dmx_release);