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 = 0 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 = 1
 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 = 0 to
 322                  * stop feeding of suspicious data until next PUSI=1 arrives
 323                  */
 324                 feed->pusi_seen = 0;
 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 = 1 */
 339                         feed->pusi_seen = 1;
 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                 if (feed->ts_type & TS_DECODER)
 371                         if (feed->demux->write_to_decoder)
 372                                 feed->demux->write_to_decoder(feed, buf, 188);
 373                 break;
 374
 375         case DMX_TYPE_SEC:
 376                 if (!feed->feed.sec.is_filtering)
 377                         break;
 378                 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
 379                         feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
 380                 break;
 381
 382         default:
 383                 break;
 384         }
 385 }
 386
 387 #define DVR_FEED(f)                                                     \
 388         (((f)->type == DMX_TYPE_TS) &&                                  \
 389         ((f)->feed.ts.is_filtering) &&                                  \
 390         (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))
 391
 392 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
 393 {
 394         struct dvb_demux_feed *feed;
 395         u16 pid = ts_pid(buf);
 396         int dvr_done = 0;
 397
 398         if (dvb_demux_speedcheck) {
 399                 ktime_t cur_time;
 400                 u64 speed_bytes, speed_timedelta;
 401
 402                 demux->speed_pkts_cnt++;
 403
 404                 /* show speed every SPEED_PKTS_INTERVAL packets */
 405                 if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) {
 406                         cur_time = ktime_get();
 407
 408                         if (ktime_to_ns(demux->speed_last_time) != 0) {
 409                                 speed_bytes = (u64)demux->speed_pkts_cnt
 410                                         * 188 * 8;
 411                                 /* convert to 1024 basis */
 412                                 speed_bytes = 1000 * div64_u64(speed_bytes,
 413                                                 1024);
 414                                 speed_timedelta = ktime_ms_delta(cur_time,
 415                                                         demux->speed_last_time);
 416                                 dprintk("TS speed %llu Kbits/sec \n",
 417                                         div64_u64(speed_bytes,
 418                                                   speed_timedelta));
 419                         }
 420
 421                         demux->speed_last_time = cur_time;
 422                         demux->speed_pkts_cnt = 0;
 423                 }
 424         }
 425
 426         if (buf[1] & 0x80) {
 427                 dprintk_tscheck("TEI detected. PID=0x%x data1=0x%x\n",
 428                                 pid, buf[1]);
 429                 /* data in this packet can't be trusted - drop it unless
 430                  * module option dvb_demux_feed_err_pkts is set */
 431                 if (!dvb_demux_feed_err_pkts)
 432                         return;
 433         } else /* if TEI bit is set, pid may be wrong- skip pkt counter */
 434                 if (demux->cnt_storage && dvb_demux_tscheck) {
 435                         /* check pkt counter */
 436                         if (pid < MAX_PID) {
 437                                 if (buf[3] & 0x10)
 438                                         demux->cnt_storage[pid] =
 439                                                 (demux->cnt_storage[pid] + 1) & 0xf;
 440
 441                                 if ((buf[3] & 0xf) != demux->cnt_storage[pid]) {
 442                                         dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n",
 443                                                 pid, demux->cnt_storage[pid],
 444                                                 buf[3] & 0xf);
 445                                         demux->cnt_storage[pid] = buf[3] & 0xf;
 446                                 }
 447                         }
 448                         /* end check */
 449                 }
 450
 451         list_for_each_entry(feed, &demux->feed_list, list_head) {
 452                 if ((feed->pid != pid) && (feed->pid != 0x2000))
 453                         continue;
 454
 455                 /* copy each packet only once to the dvr device, even
 456                  * if a PID is in multiple filters (e.g. video + PCR) */
 457                 if ((DVR_FEED(feed)) && (dvr_done++))
 458                         continue;
 459
 460                 if (feed->pid == pid)
 461                         dvb_dmx_swfilter_packet_type(feed, buf);
 462                 else if (feed->pid == 0x2000)
 463                         feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts);
 464         }
 465 }
 466
 467 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
 468                               size_t count)
 469 {
 470         unsigned long flags;
 471
 472         spin_lock_irqsave(&demux->lock, flags);
 473
 474         while (count--) {
 475                 if (buf[0] == 0x47)
 476                         dvb_dmx_swfilter_packet(demux, buf);
 477                 buf += 188;
 478         }
 479
 480         spin_unlock_irqrestore(&demux->lock, flags);
 481 }
 482
 483 EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
 484
 485 static inline int find_next_packet(const u8 *buf, int pos, size_t count,
 486                                    const int pktsize)
 487 {
 488         int start = pos, lost;
 489
 490         while (pos < count) {
 491                 if (buf[pos] == 0x47 ||
 492                     (pktsize == 204 && buf[pos] == 0xB8))
 493                         break;
 494                 pos++;
 495         }
 496
 497         lost = pos - start;
 498         if (lost) {
 499                 /* This garbage is part of a valid packet? */
 500                 int backtrack = pos - pktsize;
 501                 if (backtrack >= 0 && (buf[backtrack] == 0x47 ||
 502                     (pktsize == 204 && buf[backtrack] == 0xB8)))
 503                         return backtrack;
 504         }
 505
 506         return pos;
 507 }
 508
 509 /* Filter all pktsize= 188 or 204 sized packets and skip garbage. */
 510 static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf,
 511                 size_t count, const int pktsize)
 512 {
 513         int p = 0, i, j;
 514         const u8 *q;
 515         unsigned long flags;
 516
 517         spin_lock_irqsave(&demux->lock, flags);
 518
 519         if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */
 520                 i = demux->tsbufp;
 521                 j = pktsize - i;
 522                 if (count < j) {
 523                         memcpy(&demux->tsbuf[i], buf, count);
 524                         demux->tsbufp += count;
 525                         goto bailout;
 526                 }
 527                 memcpy(&demux->tsbuf[i], buf, j);
 528                 if (demux->tsbuf[0] == 0x47) /* double check */
 529                         dvb_dmx_swfilter_packet(demux, demux->tsbuf);
 530                 demux->tsbufp = 0;
 531                 p += j;
 532         }
 533
 534         while (1) {
 535                 p = find_next_packet(buf, p, count, pktsize);
 536                 if (p >= count)
 537                         break;
 538                 if (count - p < pktsize)
 539                         break;
 540
 541                 q = &buf[p];
 542
 543                 if (pktsize == 204 && (*q == 0xB8)) {
 544                         memcpy(demux->tsbuf, q, 188);
 545                         demux->tsbuf[0] = 0x47;
 546                         q = demux->tsbuf;
 547                 }
 548                 dvb_dmx_swfilter_packet(demux, q);
 549                 p += pktsize;
 550         }
 551
 552         i = count - p;
 553         if (i) {
 554                 memcpy(demux->tsbuf, &buf[p], i);
 555                 demux->tsbufp = i;
 556                 if (pktsize == 204 && demux->tsbuf[0] == 0xB8)
 557                         demux->tsbuf[0] = 0x47;
 558         }
 559
 560 bailout:
 561         spin_unlock_irqrestore(&demux->lock, flags);
 562 }
 563
 564 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
 565 {
 566         _dvb_dmx_swfilter(demux, buf, count, 188);
 567 }
 568 EXPORT_SYMBOL(dvb_dmx_swfilter);
 569
 570 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
 571 {
 572         _dvb_dmx_swfilter(demux, buf, count, 204);
 573 }
 574 EXPORT_SYMBOL(dvb_dmx_swfilter_204);
 575
 576 void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count)
 577 {
 578         unsigned long flags;
 579
 580         spin_lock_irqsave(&demux->lock, flags);
 581
 582         demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts);
 583
 584         spin_unlock_irqrestore(&demux->lock, flags);
 585 }
 586 EXPORT_SYMBOL(dvb_dmx_swfilter_raw);
 587
 588 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
 589 {
 590         int i;
 591
 592         for (i = 0; i < demux->filternum; i++)
 593                 if (demux->filter[i].state == DMX_STATE_FREE)
 594                         break;
 595
 596         if (i == demux->filternum)
 597                 return NULL;
 598
 599         demux->filter[i].state = DMX_STATE_ALLOCATED;
 600
 601         return &demux->filter[i];
 602 }
 603
 604 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
 605 {
 606         int i;
 607
 608         for (i = 0; i < demux->feednum; i++)
 609                 if (demux->feed[i].state == DMX_STATE_FREE)
 610                         break;
 611
 612         if (i == demux->feednum)
 613                 return NULL;
 614
 615         demux->feed[i].state = DMX_STATE_ALLOCATED;
 616
 617         return &demux->feed[i];
 618 }
 619
 620 static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
 621 {
 622         struct dvb_demux_feed *entry;
 623
 624         list_for_each_entry(entry, &feed->demux->feed_list, list_head)
 625                 if (entry == feed)
 626                         return 1;
 627
 628         return 0;
 629 }
 630
 631 static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
 632 {
 633         spin_lock_irq(&feed->demux->lock);
 634         if (dvb_demux_feed_find(feed)) {
 635                 pr_err("%s: feed already in list (type=%x state=%x pid=%x)\n",
 636                        __func__, feed->type, feed->state, feed->pid);
 637                 goto out;
 638         }
 639
 640         list_add(&feed->list_head, &feed->demux->feed_list);
 641 out:
 642         spin_unlock_irq(&feed->demux->lock);
 643 }
 644
 645 static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
 646 {
 647         spin_lock_irq(&feed->demux->lock);
 648         if (!(dvb_demux_feed_find(feed))) {
 649                 pr_err("%s: feed not in list (type=%x state=%x pid=%x)\n",
 650                        __func__, feed->type, feed->state, feed->pid);
 651                 goto out;
 652         }
 653
 654         list_del(&feed->list_head);
 655 out:
 656         spin_unlock_irq(&feed->demux->lock);
 657 }
 658
 659 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
 660                            enum dmx_ts_pes pes_type, ktime_t timeout)
 661 {
 662         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 663         struct dvb_demux *demux = feed->demux;
 664
 665         if (pid > DMX_MAX_PID)
 666                 return -EINVAL;
 667
 668         if (mutex_lock_interruptible(&demux->mutex))
 669                 return -ERESTARTSYS;
 670
 671         if (ts_type & TS_DECODER) {
 672                 if (pes_type >= DMX_PES_OTHER) {
 673                         mutex_unlock(&demux->mutex);
 674                         return -EINVAL;
 675                 }
 676
 677                 if (demux->pesfilter[pes_type] &&
 678                     demux->pesfilter[pes_type] != feed) {
 679                         mutex_unlock(&demux->mutex);
 680                         return -EINVAL;
 681                 }
 682
 683                 demux->pesfilter[pes_type] = feed;
 684                 demux->pids[pes_type] = pid;
 685         }
 686
 687         dvb_demux_feed_add(feed);
 688
 689         feed->pid = pid;
 690         feed->timeout = timeout;
 691         feed->ts_type = ts_type;
 692         feed->pes_type = pes_type;
 693
 694         feed->state = DMX_STATE_READY;
 695         mutex_unlock(&demux->mutex);
 696
 697         return 0;
 698 }
 699
 700 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
 701 {
 702         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 703         struct dvb_demux *demux = feed->demux;
 704         int ret;
 705
 706         if (mutex_lock_interruptible(&demux->mutex))
 707                 return -ERESTARTSYS;
 708
 709         if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
 710                 mutex_unlock(&demux->mutex);
 711                 return -EINVAL;
 712         }
 713
 714         if (!demux->start_feed) {
 715                 mutex_unlock(&demux->mutex);
 716                 return -ENODEV;
 717         }
 718
 719         if ((ret = demux->start_feed(feed)) < 0) {
 720                 mutex_unlock(&demux->mutex);
 721                 return ret;
 722         }
 723
 724         spin_lock_irq(&demux->lock);
 725         ts_feed->is_filtering = 1;
 726         feed->state = DMX_STATE_GO;
 727         spin_unlock_irq(&demux->lock);
 728         mutex_unlock(&demux->mutex);
 729
 730         return 0;
 731 }
 732
 733 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
 734 {
 735         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 736         struct dvb_demux *demux = feed->demux;
 737         int ret;
 738
 739         mutex_lock(&demux->mutex);
 740
 741         if (feed->state < DMX_STATE_GO) {
 742                 mutex_unlock(&demux->mutex);
 743                 return -EINVAL;
 744         }
 745
 746         if (!demux->stop_feed) {
 747                 mutex_unlock(&demux->mutex);
 748                 return -ENODEV;
 749         }
 750
 751         ret = demux->stop_feed(feed);
 752
 753         spin_lock_irq(&demux->lock);
 754         ts_feed->is_filtering = 0;
 755         feed->state = DMX_STATE_ALLOCATED;
 756         spin_unlock_irq(&demux->lock);
 757         mutex_unlock(&demux->mutex);
 758
 759         return ret;
 760 }
 761
 762 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
 763                                    struct dmx_ts_feed **ts_feed,
 764                                    dmx_ts_cb callback)
 765 {
 766         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 767         struct dvb_demux_feed *feed;
 768
 769         if (mutex_lock_interruptible(&demux->mutex))
 770                 return -ERESTARTSYS;
 771
 772         if (!(feed = dvb_dmx_feed_alloc(demux))) {
 773                 mutex_unlock(&demux->mutex);
 774                 return -EBUSY;
 775         }
 776
 777         feed->type = DMX_TYPE_TS;
 778         feed->cb.ts = callback;
 779         feed->demux = demux;
 780         feed->pid = 0xffff;
 781         feed->peslen = 0xfffa;
 782
 783         (*ts_feed) = &feed->feed.ts;
 784         (*ts_feed)->parent = dmx;
 785         (*ts_feed)->priv = NULL;
 786         (*ts_feed)->is_filtering = 0;
 787         (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
 788         (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
 789         (*ts_feed)->set = dmx_ts_feed_set;
 790
 791         if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
 792                 feed->state = DMX_STATE_FREE;
 793                 mutex_unlock(&demux->mutex);
 794                 return -EBUSY;
 795         }
 796
 797         feed->filter->type = DMX_TYPE_TS;
 798         feed->filter->feed = feed;
 799         feed->filter->state = DMX_STATE_READY;
 800
 801         mutex_unlock(&demux->mutex);
 802
 803         return 0;
 804 }
 805
 806 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
 807                                   struct dmx_ts_feed *ts_feed)
 808 {
 809         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 810         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 811
 812         mutex_lock(&demux->mutex);
 813
 814         if (feed->state == DMX_STATE_FREE) {
 815                 mutex_unlock(&demux->mutex);
 816                 return -EINVAL;
 817         }
 818
 819         feed->state = DMX_STATE_FREE;
 820         feed->filter->state = DMX_STATE_FREE;
 821
 822         dvb_demux_feed_del(feed);
 823
 824         feed->pid = 0xffff;
 825
 826         if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER)
 827                 demux->pesfilter[feed->pes_type] = NULL;
 828
 829         mutex_unlock(&demux->mutex);
 830         return 0;
 831 }
 832
 833 /******************************************************************************
 834  * dmx_section_feed API calls
 835  ******************************************************************************/
 836
 837 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
 838                                             struct dmx_section_filter **filter)
 839 {
 840         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 841         struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
 842         struct dvb_demux_filter *dvbdmxfilter;
 843
 844         if (mutex_lock_interruptible(&dvbdemux->mutex))
 845                 return -ERESTARTSYS;
 846
 847         dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
 848         if (!dvbdmxfilter) {
 849                 mutex_unlock(&dvbdemux->mutex);
 850                 return -EBUSY;
 851         }
 852
 853         spin_lock_irq(&dvbdemux->lock);
 854         *filter = &dvbdmxfilter->filter;
 855         (*filter)->parent = feed;
 856         (*filter)->priv = NULL;
 857         dvbdmxfilter->feed = dvbdmxfeed;
 858         dvbdmxfilter->type = DMX_TYPE_SEC;
 859         dvbdmxfilter->state = DMX_STATE_READY;
 860         dvbdmxfilter->next = dvbdmxfeed->filter;
 861         dvbdmxfeed->filter = dvbdmxfilter;
 862         spin_unlock_irq(&dvbdemux->lock);
 863
 864         mutex_unlock(&dvbdemux->mutex);
 865         return 0;
 866 }
 867
 868 static int dmx_section_feed_set(struct dmx_section_feed *feed,
 869                                 u16 pid, int check_crc)
 870 {
 871         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 872         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 873
 874         if (pid > 0x1fff)
 875                 return -EINVAL;
 876
 877         if (mutex_lock_interruptible(&dvbdmx->mutex))
 878                 return -ERESTARTSYS;
 879
 880         dvb_demux_feed_add(dvbdmxfeed);
 881
 882         dvbdmxfeed->pid = pid;
 883         dvbdmxfeed->feed.sec.check_crc = check_crc;
 884
 885         dvbdmxfeed->state = DMX_STATE_READY;
 886         mutex_unlock(&dvbdmx->mutex);
 887         return 0;
 888 }
 889
 890 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
 891 {
 892         int i;
 893         struct dvb_demux_filter *f;
 894         struct dmx_section_filter *sf;
 895         u8 mask, mode, doneq;
 896
 897         if (!(f = dvbdmxfeed->filter))
 898                 return;
 899         do {
 900                 sf = &f->filter;
 901                 doneq = 0;
 902                 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 903                         mode = sf->filter_mode[i];
 904                         mask = sf->filter_mask[i];
 905                         f->maskandmode[i] = mask & mode;
 906                         doneq |= f->maskandnotmode[i] = mask & ~mode;
 907                 }
 908                 f->doneq = doneq ? 1 : 0;
 909         } while ((f = f->next));
 910 }
 911
 912 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
 913 {
 914         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 915         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 916         int ret;
 917
 918         if (mutex_lock_interruptible(&dvbdmx->mutex))
 919                 return -ERESTARTSYS;
 920
 921         if (feed->is_filtering) {
 922                 mutex_unlock(&dvbdmx->mutex);
 923                 return -EBUSY;
 924         }
 925
 926         if (!dvbdmxfeed->filter) {
 927                 mutex_unlock(&dvbdmx->mutex);
 928                 return -EINVAL;
 929         }
 930
 931         dvbdmxfeed->feed.sec.tsfeedp = 0;
 932         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
 933         dvbdmxfeed->feed.sec.secbufp = 0;
 934         dvbdmxfeed->feed.sec.seclen = 0;
 935
 936         if (!dvbdmx->start_feed) {
 937                 mutex_unlock(&dvbdmx->mutex);
 938                 return -ENODEV;
 939         }
 940
 941         prepare_secfilters(dvbdmxfeed);
 942
 943         if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
 944                 mutex_unlock(&dvbdmx->mutex);
 945                 return ret;
 946         }
 947
 948         spin_lock_irq(&dvbdmx->lock);
 949         feed->is_filtering = 1;
 950         dvbdmxfeed->state = DMX_STATE_GO;
 951         spin_unlock_irq(&dvbdmx->lock);
 952
 953         mutex_unlock(&dvbdmx->mutex);
 954         return 0;
 955 }
 956
 957 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
 958 {
 959         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 960         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 961         int ret;
 962
 963         mutex_lock(&dvbdmx->mutex);
 964
 965         if (!dvbdmx->stop_feed) {
 966                 mutex_unlock(&dvbdmx->mutex);
 967                 return -ENODEV;
 968         }
 969
 970         ret = dvbdmx->stop_feed(dvbdmxfeed);
 971
 972         spin_lock_irq(&dvbdmx->lock);
 973         dvbdmxfeed->state = DMX_STATE_READY;
 974         feed->is_filtering = 0;
 975         spin_unlock_irq(&dvbdmx->lock);
 976
 977         mutex_unlock(&dvbdmx->mutex);
 978         return ret;
 979 }
 980
 981 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
 982                                            struct dmx_section_filter *filter)
 983 {
 984         struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
 985         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 986         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 987
 988         mutex_lock(&dvbdmx->mutex);
 989
 990         if (dvbdmxfilter->feed != dvbdmxfeed) {
 991                 mutex_unlock(&dvbdmx->mutex);
 992                 return -EINVAL;
 993         }
 994
 995         if (feed->is_filtering) {
 996                 /* release dvbdmx->mutex as far as it is
 997                    acquired by stop_filtering() itself */
 998                 mutex_unlock(&dvbdmx->mutex);
 999                 feed->stop_filtering(feed);
1000                 mutex_lock(&dvbdmx->mutex);
1001         }
1002
1003         spin_lock_irq(&dvbdmx->lock);
1004         f = dvbdmxfeed->filter;
1005
1006         if (f == dvbdmxfilter) {
1007                 dvbdmxfeed->filter = dvbdmxfilter->next;
1008         } else {
1009                 while (f->next != dvbdmxfilter)
1010                         f = f->next;
1011                 f->next = f->next->next;
1012         }
1013
1014         dvbdmxfilter->state = DMX_STATE_FREE;
1015         spin_unlock_irq(&dvbdmx->lock);
1016         mutex_unlock(&dvbdmx->mutex);
1017         return 0;
1018 }
1019
1020 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
1021                                         struct dmx_section_feed **feed,
1022                                         dmx_section_cb callback)
1023 {
1024         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1025         struct dvb_demux_feed *dvbdmxfeed;
1026
1027         if (mutex_lock_interruptible(&dvbdmx->mutex))
1028                 return -ERESTARTSYS;
1029
1030         if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
1031                 mutex_unlock(&dvbdmx->mutex);
1032                 return -EBUSY;
1033         }
1034
1035         dvbdmxfeed->type = DMX_TYPE_SEC;
1036         dvbdmxfeed->cb.sec = callback;
1037         dvbdmxfeed->demux = dvbdmx;
1038         dvbdmxfeed->pid = 0xffff;
1039         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
1040         dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
1041         dvbdmxfeed->feed.sec.tsfeedp = 0;
1042         dvbdmxfeed->filter = NULL;
1043
1044         (*feed) = &dvbdmxfeed->feed.sec;
1045         (*feed)->is_filtering = 0;
1046         (*feed)->parent = demux;
1047         (*feed)->priv = NULL;
1048
1049         (*feed)->set = dmx_section_feed_set;
1050         (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1051         (*feed)->start_filtering = dmx_section_feed_start_filtering;
1052         (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1053         (*feed)->release_filter = dmx_section_feed_release_filter;
1054
1055         mutex_unlock(&dvbdmx->mutex);
1056         return 0;
1057 }
1058
1059 static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1060                                        struct dmx_section_feed *feed)
1061 {
1062         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1063         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1064
1065         mutex_lock(&dvbdmx->mutex);
1066
1067         if (dvbdmxfeed->state == DMX_STATE_FREE) {
1068                 mutex_unlock(&dvbdmx->mutex);
1069                 return -EINVAL;
1070         }
1071         dvbdmxfeed->state = DMX_STATE_FREE;
1072
1073         dvb_demux_feed_del(dvbdmxfeed);
1074
1075         dvbdmxfeed->pid = 0xffff;
1076
1077         mutex_unlock(&dvbdmx->mutex);
1078         return 0;
1079 }
1080
1081 /******************************************************************************
1082  * dvb_demux kernel data API calls
1083  ******************************************************************************/
1084
1085 static int dvbdmx_open(struct dmx_demux *demux)
1086 {
1087         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1088
1089         if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1090                 return -EUSERS;
1091
1092         dvbdemux->users++;
1093         return 0;
1094 }
1095
1096 static int dvbdmx_close(struct dmx_demux *demux)
1097 {
1098         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1099
1100         if (dvbdemux->users == 0)
1101                 return -ENODEV;
1102
1103         dvbdemux->users--;
1104         //FIXME: release any unneeded resources if users==0
1105         return 0;
1106 }
1107
1108 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
1109 {
1110         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1111         void *p;
1112
1113         if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1114                 return -EINVAL;
1115
1116         p = memdup_user(buf, count);
1117         if (IS_ERR(p))
1118                 return PTR_ERR(p);
1119         if (mutex_lock_interruptible(&dvbdemux->mutex)) {
1120                 kfree(p);
1121                 return -ERESTARTSYS;
1122         }
1123         dvb_dmx_swfilter(dvbdemux, p, count);
1124         kfree(p);
1125         mutex_unlock(&dvbdemux->mutex);
1126
1127         if (signal_pending(current))
1128                 return -EINTR;
1129         return count;
1130 }
1131
1132 static int dvbdmx_add_frontend(struct dmx_demux *demux,
1133                                struct dmx_frontend *frontend)
1134 {
1135         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1136         struct list_head *head = &dvbdemux->frontend_list;
1137
1138         list_add(&(frontend->connectivity_list), head);
1139
1140         return 0;
1141 }
1142
1143 static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1144                                   struct dmx_frontend *frontend)
1145 {
1146         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1147         struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1148
1149         list_for_each_safe(pos, n, head) {
1150                 if (DMX_FE_ENTRY(pos) == frontend) {
1151                         list_del(pos);
1152                         return 0;
1153                 }
1154         }
1155
1156         return -ENODEV;
1157 }
1158
1159 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1160 {
1161         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1162
1163         if (list_empty(&dvbdemux->frontend_list))
1164                 return NULL;
1165
1166         return &dvbdemux->frontend_list;
1167 }
1168
1169 static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1170                                    struct dmx_frontend *frontend)
1171 {
1172         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1173
1174         if (demux->frontend)
1175                 return -EINVAL;
1176
1177         mutex_lock(&dvbdemux->mutex);
1178
1179         demux->frontend = frontend;
1180         mutex_unlock(&dvbdemux->mutex);
1181         return 0;
1182 }
1183
1184 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1185 {
1186         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1187
1188         mutex_lock(&dvbdemux->mutex);
1189
1190         demux->frontend = NULL;
1191         mutex_unlock(&dvbdemux->mutex);
1192         return 0;
1193 }
1194
1195 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1196 {
1197         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1198
1199         memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1200         return 0;
1201 }
1202
1203 int dvb_dmx_init(struct dvb_demux *dvbdemux)
1204 {
1205         int i;
1206         struct dmx_demux *dmx = &dvbdemux->dmx;
1207
1208         dvbdemux->cnt_storage = NULL;
1209         dvbdemux->users = 0;
1210         dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter));
1211
1212         if (!dvbdemux->filter)
1213                 return -ENOMEM;
1214
1215         dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed));
1216         if (!dvbdemux->feed) {
1217                 vfree(dvbdemux->filter);
1218                 dvbdemux->filter = NULL;
1219                 return -ENOMEM;
1220         }
1221         for (i = 0; i < dvbdemux->filternum; i++) {
1222                 dvbdemux->filter[i].state = DMX_STATE_FREE;
1223                 dvbdemux->filter[i].index = i;
1224         }
1225         for (i = 0; i < dvbdemux->feednum; i++) {
1226                 dvbdemux->feed[i].state = DMX_STATE_FREE;
1227                 dvbdemux->feed[i].index = i;
1228         }
1229
1230         dvbdemux->cnt_storage = vmalloc(MAX_PID + 1);
1231         if (!dvbdemux->cnt_storage)
1232                 pr_warn("Couldn't allocate memory for TS/TEI check. Disabling it\n");
1233
1234         INIT_LIST_HEAD(&dvbdemux->frontend_list);
1235
1236         for (i = 0; i < DMX_PES_OTHER; i++) {
1237                 dvbdemux->pesfilter[i] = NULL;
1238                 dvbdemux->pids[i] = 0xffff;
1239         }
1240
1241         INIT_LIST_HEAD(&dvbdemux->feed_list);
1242
1243         dvbdemux->playing = 0;
1244         dvbdemux->recording = 0;
1245         dvbdemux->tsbufp = 0;
1246
1247         if (!dvbdemux->check_crc32)
1248                 dvbdemux->check_crc32 = dvb_dmx_crc32;
1249
1250         if (!dvbdemux->memcopy)
1251                 dvbdemux->memcopy = dvb_dmx_memcopy;
1252
1253         dmx->frontend = NULL;
1254         dmx->priv = dvbdemux;
1255         dmx->open = dvbdmx_open;
1256         dmx->close = dvbdmx_close;
1257         dmx->write = dvbdmx_write;
1258         dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1259         dmx->release_ts_feed = dvbdmx_release_ts_feed;
1260         dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1261         dmx->release_section_feed = dvbdmx_release_section_feed;
1262
1263         dmx->add_frontend = dvbdmx_add_frontend;
1264         dmx->remove_frontend = dvbdmx_remove_frontend;
1265         dmx->get_frontends = dvbdmx_get_frontends;
1266         dmx->connect_frontend = dvbdmx_connect_frontend;
1267         dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1268         dmx->get_pes_pids = dvbdmx_get_pes_pids;
1269
1270         mutex_init(&dvbdemux->mutex);
1271         spin_lock_init(&dvbdemux->lock);
1272
1273         return 0;
1274 }
1275
1276 EXPORT_SYMBOL(dvb_dmx_init);
1277
1278 void dvb_dmx_release(struct dvb_demux *dvbdemux)
1279 {
1280         vfree(dvbdemux->cnt_storage);
1281         vfree(dvbdemux->filter);
1282         vfree(dvbdemux->feed);
1283 }
1284
1285 EXPORT_SYMBOL(dvb_dmx_release);