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  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21  *
  22  */
  23
  24 #define pr_fmt(fmt) "dvb_demux: " fmt
  25
  26 #include <linux/sched.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/slab.h>
  29 #include <linux/vmalloc.h>
  30 #include <linux/module.h>
  31 #include <linux/poll.h>
  32 #include <linux/string.h>
  33 #include <linux/crc32.h>
  34 #include <linux/uaccess.h>
  35 #include <asm/div64.h>
  36
  37 #include "dvb_demux.h"
  38
  39 static int dvb_demux_tscheck;
  40 module_param(dvb_demux_tscheck, int, 0644);
  41 MODULE_PARM_DESC(dvb_demux_tscheck,
  42                 "enable transport stream continuity and TEI check");
  43
  44 static int dvb_demux_speedcheck;
  45 module_param(dvb_demux_speedcheck, int, 0644);
  46 MODULE_PARM_DESC(dvb_demux_speedcheck,
  47                 "enable transport stream speed check");
  48
  49 static int dvb_demux_feed_err_pkts = 1;
  50 module_param(dvb_demux_feed_err_pkts, int, 0644);
  51 MODULE_PARM_DESC(dvb_demux_feed_err_pkts,
  52                  "when set to 0, drop packets with the TEI bit set (1 by default)");
  53
  54 #define dprintk(fmt, arg...) \
  55         printk(KERN_DEBUG pr_fmt("%s: " fmt),  __func__, ##arg)
  56
  57 #define dprintk_tscheck(x...) do {                      \
  58         if (dvb_demux_tscheck && printk_ratelimit())    \
  59                 dprintk(x);                             \
  60 } while (0)
  61
  62 /******************************************************************************
  63  * static inlined helper functions
  64  ******************************************************************************/
  65
  66 static inline u16 section_length(const u8 *buf)
  67 {
  68         return 3 + ((buf[1] & 0x0f) << 8) + buf[2];
  69 }
  70
  71 static inline u16 ts_pid(const u8 *buf)
  72 {
  73         return ((buf[1] & 0x1f) << 8) + buf[2];
  74 }
  75
  76 static inline u8 payload(const u8 *tsp)
  77 {
  78         if (!(tsp[3] & 0x10))   // no payload?
  79                 return 0;
  80
  81         if (tsp[3] & 0x20) {    // adaptation field?
  82                 if (tsp[4] > 183)       // corrupted data?
  83                         return 0;
  84                 else
  85                         return 184 - 1 - tsp[4];
  86         }
  87
  88         return 184;
  89 }
  90
  91 static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len)
  92 {
  93         return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len));
  94 }
  95
  96 static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s,
  97                             size_t len)
  98 {
  99         memcpy(d, s, len);
 100 }
 101
 102 /******************************************************************************
 103  * Software filter functions
 104  ******************************************************************************/
 105
 106 static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed,
 107                                            const u8 *buf)
 108 {
 109         int count = payload(buf);
 110         int p;
 111 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 112         int ccok;
 113         u8 cc;
 114 #endif
 115
 116         if (count == 0)
 117                 return -1;
 118
 119         p = 188 - count;
 120
 121 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 122         cc = buf[3] & 0x0f;
 123         ccok = ((feed->cc + 1) & 0x0f) == cc;
 124         feed->cc = cc;
 125         if (!ccok)
 126                 dprintk("missed packet!\n");
 127 #endif
 128
 129         if (buf[1] & 0x40)      // PUSI ?
 130                 feed->peslen = 0xfffa;
 131
 132         feed->peslen += count;
 133
 134         return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts);
 135 }
 136
 137 static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed,
 138                                           struct dvb_demux_filter *f)
 139 {
 140         u8 neq = 0;
 141         int i;
 142
 143         for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 144                 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
 145
 146                 if (f->maskandmode[i] & xor)
 147                         return 0;
 148
 149                 neq |= f->maskandnotmode[i] & xor;
 150         }
 151
 152         if (f->doneq && !neq)
 153                 return 0;
 154
 155         return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen,
 156                             NULL, 0, &f->filter);
 157 }
 158
 159 static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed)
 160 {
 161         struct dvb_demux *demux = feed->demux;
 162         struct dvb_demux_filter *f = feed->filter;
 163         struct dmx_section_feed *sec = &feed->feed.sec;
 164         int section_syntax_indicator;
 165
 166         if (!sec->is_filtering)
 167                 return 0;
 168
 169         if (!f)
 170                 return 0;
 171
 172         if (sec->check_crc) {
 173                 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
 174                 if (section_syntax_indicator &&
 175                     demux->check_crc32(feed, sec->secbuf, sec->seclen))
 176                         return -1;
 177         }
 178
 179         do {
 180                 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)
 181                         return -1;
 182         } while ((f = f->next) && sec->is_filtering);
 183
 184         sec->seclen = 0;
 185
 186         return 0;
 187 }
 188
 189 static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
 190 {
 191         struct dmx_section_feed *sec = &feed->feed.sec;
 192
 193 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 194         if (sec->secbufp < sec->tsfeedp) {
 195                 int i, n = sec->tsfeedp - sec->secbufp;
 196
 197                 /*
 198                  * Section padding is done with 0xff bytes entirely.
 199                  * Due to speed reasons, we won't check all of them
 200                  * but just first and last.
 201                  */
 202                 if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) {
 203                         dprintk("dvb_demux.c section ts padding loss: %d/%d\n",
 204                                n, sec->tsfeedp);
 205                         dprintk("dvb_demux.c pad data:");
 206                         for (i = 0; i < n; i++)
 207                                 pr_cont(" %02x", sec->secbuf[i]);
 208                         pr_cont("\n");
 209                 }
 210         }
 211 #endif
 212
 213         sec->tsfeedp = sec->secbufp = sec->seclen = 0;
 214         sec->secbuf = sec->secbuf_base;
 215 }
 216
 217 /*
 218  * Losless Section Demux 1.4.1 by Emard
 219  * Valsecchi Patrick:
 220  *  - middle of section A  (no PUSI)
 221  *  - end of section A and start of section B
 222  *    (with PUSI pointing to the start of the second section)
 223  *
 224  *  In this case, without feed->pusi_seen you'll receive a garbage section
 225  *  consisting of the end of section A. Basically because tsfeedp
 226  *  is incemented and the use=0 condition is not raised
 227  *  when the second packet arrives.
 228  *
 229  * Fix:
 230  * when demux is started, let feed->pusi_seen = 0 to
 231  * prevent initial feeding of garbage from the end of
 232  * previous section. When you for the first time see PUSI=1
 233  * then set feed->pusi_seen = 1
 234  */
 235 static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed,
 236                                               const u8 *buf, u8 len)
 237 {
 238         struct dvb_demux *demux = feed->demux;
 239         struct dmx_section_feed *sec = &feed->feed.sec;
 240         u16 limit, seclen, n;
 241
 242         if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
 243                 return 0;
 244
 245         if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
 246 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 247                 dprintk("dvb_demux.c section buffer full loss: %d/%d\n",
 248                        sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,
 249                        DMX_MAX_SECFEED_SIZE);
 250 #endif
 251                 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
 252         }
 253
 254         if (len <= 0)
 255                 return 0;
 256
 257         demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
 258         sec->tsfeedp += len;
 259
 260         /*
 261          * Dump all the sections we can find in the data (Emard)
 262          */
 263         limit = sec->tsfeedp;
 264         if (limit > DMX_MAX_SECFEED_SIZE)
 265                 return -1;      /* internal error should never happen */
 266
 267         /* to be sure always set secbuf */
 268         sec->secbuf = sec->secbuf_base + sec->secbufp;
 269
 270         for (n = 0; sec->secbufp + 2 < limit; n++) {
 271                 seclen = section_length(sec->secbuf);
 272                 if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE
 273                     || seclen + sec->secbufp > limit)
 274                         return 0;
 275                 sec->seclen = seclen;
 276                 sec->crc_val = ~0;
 277                 /* dump [secbuf .. secbuf+seclen) */
 278                 if (feed->pusi_seen)
 279                         dvb_dmx_swfilter_section_feed(feed);
 280 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 281                 else
 282                         dprintk("dvb_demux.c pusi not seen, discarding section data\n");
 283 #endif
 284                 sec->secbufp += seclen; /* secbufp and secbuf moving together is */
 285                 sec->secbuf += seclen;  /* redundant but saves pointer arithmetic */
 286         }
 287
 288         return 0;
 289 }
 290
 291 static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,
 292                                            const u8 *buf)
 293 {
 294         u8 p, count;
 295         int ccok, dc_i = 0;
 296         u8 cc;
 297
 298         count = payload(buf);
 299
 300         if (count == 0)         /* count == 0 if no payload or out of range */
 301                 return -1;
 302
 303         p = 188 - count;        /* payload start */
 304
 305         cc = buf[3] & 0x0f;
 306         ccok = ((feed->cc + 1) & 0x0f) == cc;
 307         feed->cc = cc;
 308
 309         if (buf[3] & 0x20) {
 310                 /* adaption field present, check for discontinuity_indicator */
 311                 if ((buf[4] > 0) && (buf[5] & 0x80))
 312                         dc_i = 1;
 313         }
 314
 315         if (!ccok || dc_i) {
 316 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 317                 dprintk("dvb_demux.c discontinuity detected %d bytes lost\n",
 318                         count);
 319                 /*
 320                  * those bytes under sume circumstances will again be reported
 321                  * in the following dvb_dmx_swfilter_section_new
 322                  */
 323 #endif
 324                 /*
 325                  * Discontinuity detected. Reset pusi_seen = 0 to
 326                  * stop feeding of suspicious data until next PUSI=1 arrives
 327                  */
 328                 feed->pusi_seen = 0;
 329                 dvb_dmx_swfilter_section_new(feed);
 330         }
 331
 332         if (buf[1] & 0x40) {
 333                 /* PUSI=1 (is set), section boundary is here */
 334                 if (count > 1 && buf[p] < count) {
 335                         const u8 *before = &buf[p + 1];
 336                         u8 before_len = buf[p];
 337                         const u8 *after = &before[before_len];
 338                         u8 after_len = count - 1 - before_len;
 339
 340                         dvb_dmx_swfilter_section_copy_dump(feed, before,
 341                                                            before_len);
 342                         /* before start of new section, set pusi_seen = 1 */
 343                         feed->pusi_seen = 1;
 344                         dvb_dmx_swfilter_section_new(feed);
 345                         dvb_dmx_swfilter_section_copy_dump(feed, after,
 346                                                            after_len);
 347                 }
 348 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
 349                 else if (count > 0)
 350                         dprintk("dvb_demux.c PUSI=1 but %d bytes lost\n",
 351                                 count);
 352 #endif
 353         } else {
 354                 /* PUSI=0 (is not set), no section boundary */
 355                 dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count);
 356         }
 357
 358         return 0;
 359 }
 360
 361 static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed,
 362                                                 const u8 *buf)
 363 {
 364         switch (feed->type) {
 365         case DMX_TYPE_TS:
 366                 if (!feed->feed.ts.is_filtering)
 367                         break;
 368                 if (feed->ts_type & TS_PACKET) {
 369                         if (feed->ts_type & TS_PAYLOAD_ONLY)
 370                                 dvb_dmx_swfilter_payload(feed, buf);
 371                         else
 372                                 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts);
 373                 }
 374                 if (feed->ts_type & TS_DECODER)
 375                         if (feed->demux->write_to_decoder)
 376                                 feed->demux->write_to_decoder(feed, buf, 188);
 377                 break;
 378
 379         case DMX_TYPE_SEC:
 380                 if (!feed->feed.sec.is_filtering)
 381                         break;
 382                 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
 383                         feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
 384                 break;
 385
 386         default:
 387                 break;
 388         }
 389 }
 390
 391 #define DVR_FEED(f)                                                     \
 392         (((f)->type == DMX_TYPE_TS) &&                                  \
 393         ((f)->feed.ts.is_filtering) &&                                  \
 394         (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))
 395
 396 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
 397 {
 398         struct dvb_demux_feed *feed;
 399         u16 pid = ts_pid(buf);
 400         int dvr_done = 0;
 401
 402         if (dvb_demux_speedcheck) {
 403                 ktime_t cur_time;
 404                 u64 speed_bytes, speed_timedelta;
 405
 406                 demux->speed_pkts_cnt++;
 407
 408                 /* show speed every SPEED_PKTS_INTERVAL packets */
 409                 if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) {
 410                         cur_time = ktime_get();
 411
 412                         if (ktime_to_ns(demux->speed_last_time) != 0) {
 413                                 speed_bytes = (u64)demux->speed_pkts_cnt
 414                                         * 188 * 8;
 415                                 /* convert to 1024 basis */
 416                                 speed_bytes = 1000 * div64_u64(speed_bytes,
 417                                                 1024);
 418                                 speed_timedelta = ktime_ms_delta(cur_time,
 419                                                         demux->speed_last_time);
 420                                 dprintk("TS speed %llu Kbits/sec \n",
 421                                         div64_u64(speed_bytes,
 422                                                   speed_timedelta));
 423                         }
 424
 425                         demux->speed_last_time = cur_time;
 426                         demux->speed_pkts_cnt = 0;
 427                 }
 428         }
 429
 430         if (buf[1] & 0x80) {
 431                 dprintk_tscheck("TEI detected. PID=0x%x data1=0x%x\n",
 432                                 pid, buf[1]);
 433                 /* data in this packet can't be trusted - drop it unless
 434                  * module option dvb_demux_feed_err_pkts is set */
 435                 if (!dvb_demux_feed_err_pkts)
 436                         return;
 437         } else /* if TEI bit is set, pid may be wrong- skip pkt counter */
 438                 if (demux->cnt_storage && dvb_demux_tscheck) {
 439                         /* check pkt counter */
 440                         if (pid < MAX_PID) {
 441                                 if (buf[3] & 0x10)
 442                                         demux->cnt_storage[pid] =
 443                                                 (demux->cnt_storage[pid] + 1) & 0xf;
 444
 445                                 if ((buf[3] & 0xf) != demux->cnt_storage[pid]) {
 446                                         dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n",
 447                                                 pid, demux->cnt_storage[pid],
 448                                                 buf[3] & 0xf);
 449                                         demux->cnt_storage[pid] = buf[3] & 0xf;
 450                                 }
 451                         }
 452                         /* end check */
 453                 }
 454
 455         list_for_each_entry(feed, &demux->feed_list, list_head) {
 456                 if ((feed->pid != pid) && (feed->pid != 0x2000))
 457                         continue;
 458
 459                 /* copy each packet only once to the dvr device, even
 460                  * if a PID is in multiple filters (e.g. video + PCR) */
 461                 if ((DVR_FEED(feed)) && (dvr_done++))
 462                         continue;
 463
 464                 if (feed->pid == pid)
 465                         dvb_dmx_swfilter_packet_type(feed, buf);
 466                 else if (feed->pid == 0x2000)
 467                         feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts);
 468         }
 469 }
 470
 471 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
 472                               size_t count)
 473 {
 474         unsigned long flags;
 475
 476         spin_lock_irqsave(&demux->lock, flags);
 477
 478         while (count--) {
 479                 if (buf[0] == 0x47)
 480                         dvb_dmx_swfilter_packet(demux, buf);
 481                 buf += 188;
 482         }
 483
 484         spin_unlock_irqrestore(&demux->lock, flags);
 485 }
 486
 487 EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
 488
 489 static inline int find_next_packet(const u8 *buf, int pos, size_t count,
 490                                    const int pktsize)
 491 {
 492         int start = pos, lost;
 493
 494         while (pos < count) {
 495                 if (buf[pos] == 0x47 ||
 496                     (pktsize == 204 && buf[pos] == 0xB8))
 497                         break;
 498                 pos++;
 499         }
 500
 501         lost = pos - start;
 502         if (lost) {
 503                 /* This garbage is part of a valid packet? */
 504                 int backtrack = pos - pktsize;
 505                 if (backtrack >= 0 && (buf[backtrack] == 0x47 ||
 506                     (pktsize == 204 && buf[backtrack] == 0xB8)))
 507                         return backtrack;
 508         }
 509
 510         return pos;
 511 }
 512
 513 /* Filter all pktsize= 188 or 204 sized packets and skip garbage. */
 514 static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf,
 515                 size_t count, const int pktsize)
 516 {
 517         int p = 0, i, j;
 518         const u8 *q;
 519         unsigned long flags;
 520
 521         spin_lock_irqsave(&demux->lock, flags);
 522
 523         if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */
 524                 i = demux->tsbufp;
 525                 j = pktsize - i;
 526                 if (count < j) {
 527                         memcpy(&demux->tsbuf[i], buf, count);
 528                         demux->tsbufp += count;
 529                         goto bailout;
 530                 }
 531                 memcpy(&demux->tsbuf[i], buf, j);
 532                 if (demux->tsbuf[0] == 0x47) /* double check */
 533                         dvb_dmx_swfilter_packet(demux, demux->tsbuf);
 534                 demux->tsbufp = 0;
 535                 p += j;
 536         }
 537
 538         while (1) {
 539                 p = find_next_packet(buf, p, count, pktsize);
 540                 if (p >= count)
 541                         break;
 542                 if (count - p < pktsize)
 543                         break;
 544
 545                 q = &buf[p];
 546
 547                 if (pktsize == 204 && (*q == 0xB8)) {
 548                         memcpy(demux->tsbuf, q, 188);
 549                         demux->tsbuf[0] = 0x47;
 550                         q = demux->tsbuf;
 551                 }
 552                 dvb_dmx_swfilter_packet(demux, q);
 553                 p += pktsize;
 554         }
 555
 556         i = count - p;
 557         if (i) {
 558                 memcpy(demux->tsbuf, &buf[p], i);
 559                 demux->tsbufp = i;
 560                 if (pktsize == 204 && demux->tsbuf[0] == 0xB8)
 561                         demux->tsbuf[0] = 0x47;
 562         }
 563
 564 bailout:
 565         spin_unlock_irqrestore(&demux->lock, flags);
 566 }
 567
 568 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
 569 {
 570         _dvb_dmx_swfilter(demux, buf, count, 188);
 571 }
 572 EXPORT_SYMBOL(dvb_dmx_swfilter);
 573
 574 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
 575 {
 576         _dvb_dmx_swfilter(demux, buf, count, 204);
 577 }
 578 EXPORT_SYMBOL(dvb_dmx_swfilter_204);
 579
 580 void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count)
 581 {
 582         unsigned long flags;
 583
 584         spin_lock_irqsave(&demux->lock, flags);
 585
 586         demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts);
 587
 588         spin_unlock_irqrestore(&demux->lock, flags);
 589 }
 590 EXPORT_SYMBOL(dvb_dmx_swfilter_raw);
 591
 592 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
 593 {
 594         int i;
 595
 596         for (i = 0; i < demux->filternum; i++)
 597                 if (demux->filter[i].state == DMX_STATE_FREE)
 598                         break;
 599
 600         if (i == demux->filternum)
 601                 return NULL;
 602
 603         demux->filter[i].state = DMX_STATE_ALLOCATED;
 604
 605         return &demux->filter[i];
 606 }
 607
 608 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
 609 {
 610         int i;
 611
 612         for (i = 0; i < demux->feednum; i++)
 613                 if (demux->feed[i].state == DMX_STATE_FREE)
 614                         break;
 615
 616         if (i == demux->feednum)
 617                 return NULL;
 618
 619         demux->feed[i].state = DMX_STATE_ALLOCATED;
 620
 621         return &demux->feed[i];
 622 }
 623
 624 static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
 625 {
 626         struct dvb_demux_feed *entry;
 627
 628         list_for_each_entry(entry, &feed->demux->feed_list, list_head)
 629                 if (entry == feed)
 630                         return 1;
 631
 632         return 0;
 633 }
 634
 635 static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
 636 {
 637         spin_lock_irq(&feed->demux->lock);
 638         if (dvb_demux_feed_find(feed)) {
 639                 pr_err("%s: feed already in list (type=%x state=%x pid=%x)\n",
 640                        __func__, feed->type, feed->state, feed->pid);
 641                 goto out;
 642         }
 643
 644         list_add(&feed->list_head, &feed->demux->feed_list);
 645 out:
 646         spin_unlock_irq(&feed->demux->lock);
 647 }
 648
 649 static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
 650 {
 651         spin_lock_irq(&feed->demux->lock);
 652         if (!(dvb_demux_feed_find(feed))) {
 653                 pr_err("%s: feed not in list (type=%x state=%x pid=%x)\n",
 654                        __func__, feed->type, feed->state, feed->pid);
 655                 goto out;
 656         }
 657
 658         list_del(&feed->list_head);
 659 out:
 660         spin_unlock_irq(&feed->demux->lock);
 661 }
 662
 663 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
 664                            enum dmx_ts_pes pes_type, ktime_t timeout)
 665 {
 666         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 667         struct dvb_demux *demux = feed->demux;
 668
 669         if (pid > DMX_MAX_PID)
 670                 return -EINVAL;
 671
 672         if (mutex_lock_interruptible(&demux->mutex))
 673                 return -ERESTARTSYS;
 674
 675         if (ts_type & TS_DECODER) {
 676                 if (pes_type >= DMX_PES_OTHER) {
 677                         mutex_unlock(&demux->mutex);
 678                         return -EINVAL;
 679                 }
 680
 681                 if (demux->pesfilter[pes_type] &&
 682                     demux->pesfilter[pes_type] != feed) {
 683                         mutex_unlock(&demux->mutex);
 684                         return -EINVAL;
 685                 }
 686
 687                 demux->pesfilter[pes_type] = feed;
 688                 demux->pids[pes_type] = pid;
 689         }
 690
 691         dvb_demux_feed_add(feed);
 692
 693         feed->pid = pid;
 694         feed->timeout = timeout;
 695         feed->ts_type = ts_type;
 696         feed->pes_type = pes_type;
 697
 698         feed->state = DMX_STATE_READY;
 699         mutex_unlock(&demux->mutex);
 700
 701         return 0;
 702 }
 703
 704 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
 705 {
 706         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 707         struct dvb_demux *demux = feed->demux;
 708         int ret;
 709
 710         if (mutex_lock_interruptible(&demux->mutex))
 711                 return -ERESTARTSYS;
 712
 713         if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
 714                 mutex_unlock(&demux->mutex);
 715                 return -EINVAL;
 716         }
 717
 718         if (!demux->start_feed) {
 719                 mutex_unlock(&demux->mutex);
 720                 return -ENODEV;
 721         }
 722
 723         if ((ret = demux->start_feed(feed)) < 0) {
 724                 mutex_unlock(&demux->mutex);
 725                 return ret;
 726         }
 727
 728         spin_lock_irq(&demux->lock);
 729         ts_feed->is_filtering = 1;
 730         feed->state = DMX_STATE_GO;
 731         spin_unlock_irq(&demux->lock);
 732         mutex_unlock(&demux->mutex);
 733
 734         return 0;
 735 }
 736
 737 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
 738 {
 739         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 740         struct dvb_demux *demux = feed->demux;
 741         int ret;
 742
 743         mutex_lock(&demux->mutex);
 744
 745         if (feed->state < DMX_STATE_GO) {
 746                 mutex_unlock(&demux->mutex);
 747                 return -EINVAL;
 748         }
 749
 750         if (!demux->stop_feed) {
 751                 mutex_unlock(&demux->mutex);
 752                 return -ENODEV;
 753         }
 754
 755         ret = demux->stop_feed(feed);
 756
 757         spin_lock_irq(&demux->lock);
 758         ts_feed->is_filtering = 0;
 759         feed->state = DMX_STATE_ALLOCATED;
 760         spin_unlock_irq(&demux->lock);
 761         mutex_unlock(&demux->mutex);
 762
 763         return ret;
 764 }
 765
 766 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
 767                                    struct dmx_ts_feed **ts_feed,
 768                                    dmx_ts_cb callback)
 769 {
 770         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 771         struct dvb_demux_feed *feed;
 772
 773         if (mutex_lock_interruptible(&demux->mutex))
 774                 return -ERESTARTSYS;
 775
 776         if (!(feed = dvb_dmx_feed_alloc(demux))) {
 777                 mutex_unlock(&demux->mutex);
 778                 return -EBUSY;
 779         }
 780
 781         feed->type = DMX_TYPE_TS;
 782         feed->cb.ts = callback;
 783         feed->demux = demux;
 784         feed->pid = 0xffff;
 785         feed->peslen = 0xfffa;
 786
 787         (*ts_feed) = &feed->feed.ts;
 788         (*ts_feed)->parent = dmx;
 789         (*ts_feed)->priv = NULL;
 790         (*ts_feed)->is_filtering = 0;
 791         (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
 792         (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
 793         (*ts_feed)->set = dmx_ts_feed_set;
 794
 795         if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
 796                 feed->state = DMX_STATE_FREE;
 797                 mutex_unlock(&demux->mutex);
 798                 return -EBUSY;
 799         }
 800
 801         feed->filter->type = DMX_TYPE_TS;
 802         feed->filter->feed = feed;
 803         feed->filter->state = DMX_STATE_READY;
 804
 805         mutex_unlock(&demux->mutex);
 806
 807         return 0;
 808 }
 809
 810 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
 811                                   struct dmx_ts_feed *ts_feed)
 812 {
 813         struct dvb_demux *demux = (struct dvb_demux *)dmx;
 814         struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 815
 816         mutex_lock(&demux->mutex);
 817
 818         if (feed->state == DMX_STATE_FREE) {
 819                 mutex_unlock(&demux->mutex);
 820                 return -EINVAL;
 821         }
 822
 823         feed->state = DMX_STATE_FREE;
 824         feed->filter->state = DMX_STATE_FREE;
 825
 826         dvb_demux_feed_del(feed);
 827
 828         feed->pid = 0xffff;
 829
 830         if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER)
 831                 demux->pesfilter[feed->pes_type] = NULL;
 832
 833         mutex_unlock(&demux->mutex);
 834         return 0;
 835 }
 836
 837 /******************************************************************************
 838  * dmx_section_feed API calls
 839  ******************************************************************************/
 840
 841 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
 842                                             struct dmx_section_filter **filter)
 843 {
 844         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 845         struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
 846         struct dvb_demux_filter *dvbdmxfilter;
 847
 848         if (mutex_lock_interruptible(&dvbdemux->mutex))
 849                 return -ERESTARTSYS;
 850
 851         dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
 852         if (!dvbdmxfilter) {
 853                 mutex_unlock(&dvbdemux->mutex);
 854                 return -EBUSY;
 855         }
 856
 857         spin_lock_irq(&dvbdemux->lock);
 858         *filter = &dvbdmxfilter->filter;
 859         (*filter)->parent = feed;
 860         (*filter)->priv = NULL;
 861         dvbdmxfilter->feed = dvbdmxfeed;
 862         dvbdmxfilter->type = DMX_TYPE_SEC;
 863         dvbdmxfilter->state = DMX_STATE_READY;
 864         dvbdmxfilter->next = dvbdmxfeed->filter;
 865         dvbdmxfeed->filter = dvbdmxfilter;
 866         spin_unlock_irq(&dvbdemux->lock);
 867
 868         mutex_unlock(&dvbdemux->mutex);
 869         return 0;
 870 }
 871
 872 static int dmx_section_feed_set(struct dmx_section_feed *feed,
 873                                 u16 pid, int check_crc)
 874 {
 875         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 876         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 877
 878         if (pid > 0x1fff)
 879                 return -EINVAL;
 880
 881         if (mutex_lock_interruptible(&dvbdmx->mutex))
 882                 return -ERESTARTSYS;
 883
 884         dvb_demux_feed_add(dvbdmxfeed);
 885
 886         dvbdmxfeed->pid = pid;
 887         dvbdmxfeed->feed.sec.check_crc = check_crc;
 888
 889         dvbdmxfeed->state = DMX_STATE_READY;
 890         mutex_unlock(&dvbdmx->mutex);
 891         return 0;
 892 }
 893
 894 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
 895 {
 896         int i;
 897         struct dvb_demux_filter *f;
 898         struct dmx_section_filter *sf;
 899         u8 mask, mode, doneq;
 900
 901         if (!(f = dvbdmxfeed->filter))
 902                 return;
 903         do {
 904                 sf = &f->filter;
 905                 doneq = 0;
 906                 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 907                         mode = sf->filter_mode[i];
 908                         mask = sf->filter_mask[i];
 909                         f->maskandmode[i] = mask & mode;
 910                         doneq |= f->maskandnotmode[i] = mask & ~mode;
 911                 }
 912                 f->doneq = doneq ? 1 : 0;
 913         } while ((f = f->next));
 914 }
 915
 916 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
 917 {
 918         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 919         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 920         int ret;
 921
 922         if (mutex_lock_interruptible(&dvbdmx->mutex))
 923                 return -ERESTARTSYS;
 924
 925         if (feed->is_filtering) {
 926                 mutex_unlock(&dvbdmx->mutex);
 927                 return -EBUSY;
 928         }
 929
 930         if (!dvbdmxfeed->filter) {
 931                 mutex_unlock(&dvbdmx->mutex);
 932                 return -EINVAL;
 933         }
 934
 935         dvbdmxfeed->feed.sec.tsfeedp = 0;
 936         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
 937         dvbdmxfeed->feed.sec.secbufp = 0;
 938         dvbdmxfeed->feed.sec.seclen = 0;
 939
 940         if (!dvbdmx->start_feed) {
 941                 mutex_unlock(&dvbdmx->mutex);
 942                 return -ENODEV;
 943         }
 944
 945         prepare_secfilters(dvbdmxfeed);
 946
 947         if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
 948                 mutex_unlock(&dvbdmx->mutex);
 949                 return ret;
 950         }
 951
 952         spin_lock_irq(&dvbdmx->lock);
 953         feed->is_filtering = 1;
 954         dvbdmxfeed->state = DMX_STATE_GO;
 955         spin_unlock_irq(&dvbdmx->lock);
 956
 957         mutex_unlock(&dvbdmx->mutex);
 958         return 0;
 959 }
 960
 961 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
 962 {
 963         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 964         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 965         int ret;
 966
 967         mutex_lock(&dvbdmx->mutex);
 968
 969         if (!dvbdmx->stop_feed) {
 970                 mutex_unlock(&dvbdmx->mutex);
 971                 return -ENODEV;
 972         }
 973
 974         ret = dvbdmx->stop_feed(dvbdmxfeed);
 975
 976         spin_lock_irq(&dvbdmx->lock);
 977         dvbdmxfeed->state = DMX_STATE_READY;
 978         feed->is_filtering = 0;
 979         spin_unlock_irq(&dvbdmx->lock);
 980
 981         mutex_unlock(&dvbdmx->mutex);
 982         return ret;
 983 }
 984
 985 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
 986                                            struct dmx_section_filter *filter)
 987 {
 988         struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
 989         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 990         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 991
 992         mutex_lock(&dvbdmx->mutex);
 993
 994         if (dvbdmxfilter->feed != dvbdmxfeed) {
 995                 mutex_unlock(&dvbdmx->mutex);
 996                 return -EINVAL;
 997         }
 998
 999         if (feed->is_filtering) {
1000                 /* release dvbdmx->mutex as far as it is
1001                    acquired by stop_filtering() itself */
1002                 mutex_unlock(&dvbdmx->mutex);
1003                 feed->stop_filtering(feed);
1004                 mutex_lock(&dvbdmx->mutex);
1005         }
1006
1007         spin_lock_irq(&dvbdmx->lock);
1008         f = dvbdmxfeed->filter;
1009
1010         if (f == dvbdmxfilter) {
1011                 dvbdmxfeed->filter = dvbdmxfilter->next;
1012         } else {
1013                 while (f->next != dvbdmxfilter)
1014                         f = f->next;
1015                 f->next = f->next->next;
1016         }
1017
1018         dvbdmxfilter->state = DMX_STATE_FREE;
1019         spin_unlock_irq(&dvbdmx->lock);
1020         mutex_unlock(&dvbdmx->mutex);
1021         return 0;
1022 }
1023
1024 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
1025                                         struct dmx_section_feed **feed,
1026                                         dmx_section_cb callback)
1027 {
1028         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1029         struct dvb_demux_feed *dvbdmxfeed;
1030
1031         if (mutex_lock_interruptible(&dvbdmx->mutex))
1032                 return -ERESTARTSYS;
1033
1034         if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
1035                 mutex_unlock(&dvbdmx->mutex);
1036                 return -EBUSY;
1037         }
1038
1039         dvbdmxfeed->type = DMX_TYPE_SEC;
1040         dvbdmxfeed->cb.sec = callback;
1041         dvbdmxfeed->demux = dvbdmx;
1042         dvbdmxfeed->pid = 0xffff;
1043         dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
1044         dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
1045         dvbdmxfeed->feed.sec.tsfeedp = 0;
1046         dvbdmxfeed->filter = NULL;
1047
1048         (*feed) = &dvbdmxfeed->feed.sec;
1049         (*feed)->is_filtering = 0;
1050         (*feed)->parent = demux;
1051         (*feed)->priv = NULL;
1052
1053         (*feed)->set = dmx_section_feed_set;
1054         (*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1055         (*feed)->start_filtering = dmx_section_feed_start_filtering;
1056         (*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1057         (*feed)->release_filter = dmx_section_feed_release_filter;
1058
1059         mutex_unlock(&dvbdmx->mutex);
1060         return 0;
1061 }
1062
1063 static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1064                                        struct dmx_section_feed *feed)
1065 {
1066         struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1067         struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1068
1069         mutex_lock(&dvbdmx->mutex);
1070
1071         if (dvbdmxfeed->state == DMX_STATE_FREE) {
1072                 mutex_unlock(&dvbdmx->mutex);
1073                 return -EINVAL;
1074         }
1075         dvbdmxfeed->state = DMX_STATE_FREE;
1076
1077         dvb_demux_feed_del(dvbdmxfeed);
1078
1079         dvbdmxfeed->pid = 0xffff;
1080
1081         mutex_unlock(&dvbdmx->mutex);
1082         return 0;
1083 }
1084
1085 /******************************************************************************
1086  * dvb_demux kernel data API calls
1087  ******************************************************************************/
1088
1089 static int dvbdmx_open(struct dmx_demux *demux)
1090 {
1091         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1092
1093         if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1094                 return -EUSERS;
1095
1096         dvbdemux->users++;
1097         return 0;
1098 }
1099
1100 static int dvbdmx_close(struct dmx_demux *demux)
1101 {
1102         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1103
1104         if (dvbdemux->users == 0)
1105                 return -ENODEV;
1106
1107         dvbdemux->users--;
1108         //FIXME: release any unneeded resources if users==0
1109         return 0;
1110 }
1111
1112 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
1113 {
1114         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1115         void *p;
1116
1117         if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1118                 return -EINVAL;
1119
1120         p = memdup_user(buf, count);
1121         if (IS_ERR(p))
1122                 return PTR_ERR(p);
1123         if (mutex_lock_interruptible(&dvbdemux->mutex)) {
1124                 kfree(p);
1125                 return -ERESTARTSYS;
1126         }
1127         dvb_dmx_swfilter(dvbdemux, p, count);
1128         kfree(p);
1129         mutex_unlock(&dvbdemux->mutex);
1130
1131         if (signal_pending(current))
1132                 return -EINTR;
1133         return count;
1134 }
1135
1136 static int dvbdmx_add_frontend(struct dmx_demux *demux,
1137                                struct dmx_frontend *frontend)
1138 {
1139         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1140         struct list_head *head = &dvbdemux->frontend_list;
1141
1142         list_add(&(frontend->connectivity_list), head);
1143
1144         return 0;
1145 }
1146
1147 static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1148                                   struct dmx_frontend *frontend)
1149 {
1150         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1151         struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1152
1153         list_for_each_safe(pos, n, head) {
1154                 if (DMX_FE_ENTRY(pos) == frontend) {
1155                         list_del(pos);
1156                         return 0;
1157                 }
1158         }
1159
1160         return -ENODEV;
1161 }
1162
1163 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1164 {
1165         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1166
1167         if (list_empty(&dvbdemux->frontend_list))
1168                 return NULL;
1169
1170         return &dvbdemux->frontend_list;
1171 }
1172
1173 static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1174                                    struct dmx_frontend *frontend)
1175 {
1176         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1177
1178         if (demux->frontend)
1179                 return -EINVAL;
1180
1181         mutex_lock(&dvbdemux->mutex);
1182
1183         demux->frontend = frontend;
1184         mutex_unlock(&dvbdemux->mutex);
1185         return 0;
1186 }
1187
1188 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1189 {
1190         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1191
1192         mutex_lock(&dvbdemux->mutex);
1193
1194         demux->frontend = NULL;
1195         mutex_unlock(&dvbdemux->mutex);
1196         return 0;
1197 }
1198
1199 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1200 {
1201         struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1202
1203         memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1204         return 0;
1205 }
1206
1207 int dvb_dmx_init(struct dvb_demux *dvbdemux)
1208 {
1209         int i;
1210         struct dmx_demux *dmx = &dvbdemux->dmx;
1211
1212         dvbdemux->cnt_storage = NULL;
1213         dvbdemux->users = 0;
1214         dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter));
1215
1216         if (!dvbdemux->filter)
1217                 return -ENOMEM;
1218
1219         dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed));
1220         if (!dvbdemux->feed) {
1221                 vfree(dvbdemux->filter);
1222                 dvbdemux->filter = NULL;
1223                 return -ENOMEM;
1224         }
1225         for (i = 0; i < dvbdemux->filternum; i++) {
1226                 dvbdemux->filter[i].state = DMX_STATE_FREE;
1227                 dvbdemux->filter[i].index = i;
1228         }
1229         for (i = 0; i < dvbdemux->feednum; i++) {
1230                 dvbdemux->feed[i].state = DMX_STATE_FREE;
1231                 dvbdemux->feed[i].index = i;
1232         }
1233
1234         dvbdemux->cnt_storage = vmalloc(MAX_PID + 1);
1235         if (!dvbdemux->cnt_storage)
1236                 pr_warn("Couldn't allocate memory for TS/TEI check. Disabling it\n");
1237
1238         INIT_LIST_HEAD(&dvbdemux->frontend_list);
1239
1240         for (i = 0; i < DMX_PES_OTHER; i++) {
1241                 dvbdemux->pesfilter[i] = NULL;
1242                 dvbdemux->pids[i] = 0xffff;
1243         }
1244
1245         INIT_LIST_HEAD(&dvbdemux->feed_list);
1246
1247         dvbdemux->playing = 0;
1248         dvbdemux->recording = 0;
1249         dvbdemux->tsbufp = 0;
1250
1251         if (!dvbdemux->check_crc32)
1252                 dvbdemux->check_crc32 = dvb_dmx_crc32;
1253
1254         if (!dvbdemux->memcopy)
1255                 dvbdemux->memcopy = dvb_dmx_memcopy;
1256
1257         dmx->frontend = NULL;
1258         dmx->priv = dvbdemux;
1259         dmx->open = dvbdmx_open;
1260         dmx->close = dvbdmx_close;
1261         dmx->write = dvbdmx_write;
1262         dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1263         dmx->release_ts_feed = dvbdmx_release_ts_feed;
1264         dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1265         dmx->release_section_feed = dvbdmx_release_section_feed;
1266
1267         dmx->add_frontend = dvbdmx_add_frontend;
1268         dmx->remove_frontend = dvbdmx_remove_frontend;
1269         dmx->get_frontends = dvbdmx_get_frontends;
1270         dmx->connect_frontend = dvbdmx_connect_frontend;
1271         dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1272         dmx->get_pes_pids = dvbdmx_get_pes_pids;
1273
1274         mutex_init(&dvbdemux->mutex);
1275         spin_lock_init(&dvbdemux->lock);
1276
1277         return 0;
1278 }
1279
1280 EXPORT_SYMBOL(dvb_dmx_init);
1281
1282 void dvb_dmx_release(struct dvb_demux *dvbdemux)
1283 {
1284         vfree(dvbdemux->cnt_storage);
1285         vfree(dvbdemux->filter);
1286         vfree(dvbdemux->feed);
1287 }
1288
1289 EXPORT_SYMBOL(dvb_dmx_release);