1// SPDX-License-Identifier: LGPL-2.1-or-later
   2/*
   3 * dvb_demux.c - DVB kernel demux API
   4 *
   5 * Copyright (C) 2000-2001 Ralph  Metzler <ralph@convergence.de>
   6 *		       & Marcus Metzler <marcus@convergence.de>
   7 *			 for convergence integrated media GmbH
   8 */
   9
  10#define pr_fmt(fmt) "dvb_demux: " fmt
  11
  12#include <linux/sched/signal.h>
  13#include <linux/spinlock.h>
  14#include <linux/slab.h>
  15#include <linux/vmalloc.h>
  16#include <linux/module.h>
  17#include <linux/poll.h>
  18#include <linux/string.h>
  19#include <linux/crc32.h>
  20#include <linux/uaccess.h>
  21#include <asm/div64.h>
  22
  23#include <media/dvb_demux.h>
  24
  25static int dvb_demux_tscheck;
  26module_param(dvb_demux_tscheck, int, 0644);
  27MODULE_PARM_DESC(dvb_demux_tscheck,
  28		"enable transport stream continuity and TEI check");
  29
  30static int dvb_demux_speedcheck;
  31module_param(dvb_demux_speedcheck, int, 0644);
  32MODULE_PARM_DESC(dvb_demux_speedcheck,
  33		"enable transport stream speed check");
  34
  35static int dvb_demux_feed_err_pkts = 1;
  36module_param(dvb_demux_feed_err_pkts, int, 0644);
  37MODULE_PARM_DESC(dvb_demux_feed_err_pkts,
  38		 "when set to 0, drop packets with the TEI bit set (1 by default)");
  39
  40#define dprintk(fmt, arg...) \
  41	printk(KERN_DEBUG pr_fmt("%s: " fmt),  __func__, ##arg)
  42
  43#define dprintk_tscheck(x...) do {			\
  44	if (dvb_demux_tscheck && printk_ratelimit())	\
  45		dprintk(x);				\
  46} while (0)
  47
  48#ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
  49#  define dprintk_sect_loss(x...) dprintk(x)
  50#else
  51#  define dprintk_sect_loss(x...)
  52#endif
  53
  54#define set_buf_flags(__feed, __flag)			\
  55	do {						\
  56		(__feed)->buffer_flags |= (__flag);	\
  57	} while (0)
  58
  59/******************************************************************************
  60 * static inlined helper functions
  61 ******************************************************************************/
  62
  63static inline u16 section_length(const u8 *buf)
  64{
  65	return 3 + ((buf[1] & 0x0f) << 8) + buf[2];
  66}
  67
  68static inline u16 ts_pid(const u8 *buf)
  69{
  70	return ((buf[1] & 0x1f) << 8) + buf[2];
  71}
  72
  73static inline u8 payload(const u8 *tsp)
  74{
  75	if (!(tsp[3] & 0x10))	// no payload?
  76		return 0;
  77
  78	if (tsp[3] & 0x20) {	// adaptation field?
  79		if (tsp[4] > 183)	// corrupted data?
  80			return 0;
  81		else
  82			return 184 - 1 - tsp[4];
  83	}
  84
  85	return 184;
  86}
  87
  88static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len)
  89{
  90	return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len));
  91}
  92
  93static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s,
  94			    size_t len)
  95{
  96	memcpy(d, s, len);
  97}
  98
  99/******************************************************************************
 100 * Software filter functions
 101 ******************************************************************************/
 102
 103static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed,
 104					   const u8 *buf)
 105{
 106	int count = payload(buf);
 107	int p;
 108	int ccok;
 109	u8 cc;
 110
 111	if (count == 0)
 112		return -1;
 113
 114	p = 188 - count;
 115
 116	cc = buf[3] & 0x0f;
 117	ccok = ((feed->cc + 1) & 0x0f) == cc;
 118	feed->cc = cc;
 119	if (!ccok) {
 120		set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
 121		dprintk_sect_loss("missed packet: %d instead of %d!\n",
 122				  cc, (feed->cc + 1) & 0x0f);
 123	}
 
 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			   &feed->buffer_flags);
 132}
 133
 134static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed,
 135					  struct dvb_demux_filter *f)
 136{
 137	u8 neq = 0;
 138	int i;
 139
 140	for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 141		u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];
 142
 143		if (f->maskandmode[i] & xor)
 144			return 0;
 145
 146		neq |= f->maskandnotmode[i] & xor;
 147	}
 148
 149	if (f->doneq && !neq)
 150		return 0;
 151
 152	return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen,
 153			    NULL, 0, &f->filter, &feed->buffer_flags);
 154}
 155
 156static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed)
 157{
 158	struct dvb_demux *demux = feed->demux;
 159	struct dvb_demux_filter *f = feed->filter;
 160	struct dmx_section_feed *sec = &feed->feed.sec;
 161	int section_syntax_indicator;
 162
 163	if (!sec->is_filtering)
 164		return 0;
 165
 166	if (!f)
 167		return 0;
 168
 169	if (sec->check_crc) {
 170		section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);
 171		if (section_syntax_indicator &&
 172		    demux->check_crc32(feed, sec->secbuf, sec->seclen)) {
 173			set_buf_flags(feed, DMX_BUFFER_FLAG_HAD_CRC32_DISCARD);
 174			return -1;
 175		}
 176	}
 177
 178	do {
 179		if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)
 180			return -1;
 181	} while ((f = f->next) && sec->is_filtering);
 182
 183	sec->seclen = 0;
 184
 185	return 0;
 186}
 187
 188static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)
 189{
 190	struct dmx_section_feed *sec = &feed->feed.sec;
 191
 192	if (sec->secbufp < sec->tsfeedp) {
 193		int n = sec->tsfeedp - sec->secbufp;
 194
 195		/*
 196		 * Section padding is done with 0xff bytes entirely.
 197		 * Due to speed reasons, we won't check all of them
 198		 * but just first and last.
 199		 */
 200		if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) {
 201			set_buf_flags(feed,
 202				      DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
 203			dprintk_sect_loss("section ts padding loss: %d/%d\n",
 204					  n, sec->tsfeedp);
 205			dprintk_sect_loss("pad data: %*ph\n", n, sec->secbuf);
 206		}
 207	}
 208
 209	sec->tsfeedp = sec->secbufp = sec->seclen = 0;
 210	sec->secbuf = sec->secbuf_base;
 211}
 212
 213/*
 214 * Losless Section Demux 1.4.1 by Emard
 215 * Valsecchi Patrick:
 216 *  - middle of section A  (no PUSI)
 217 *  - end of section A and start of section B
 218 *    (with PUSI pointing to the start of the second section)
 219 *
 220 *  In this case, without feed->pusi_seen you'll receive a garbage section
 221 *  consisting of the end of section A. Basically because tsfeedp
 222 *  is incemented and the use=0 condition is not raised
 223 *  when the second packet arrives.
 224 *
 225 * Fix:
 226 * when demux is started, let feed->pusi_seen = false to
 227 * prevent initial feeding of garbage from the end of
 228 * previous section. When you for the first time see PUSI=1
 229 * then set feed->pusi_seen = true
 230 */
 231static 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;
 237
 238	if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)
 239		return 0;
 240
 241	if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
 242		set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
 243		dprintk_sect_loss("section buffer full loss: %d/%d\n",
 244				  sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,
 245				  DMX_MAX_SECFEED_SIZE);
 246		len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
 247	}
 248
 249	if (len <= 0)
 250		return 0;
 251
 252	demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);
 253	sec->tsfeedp += len;
 254
 255	/*
 256	 * Dump all the sections we can find in the data (Emard)
 257	 */
 258	limit = sec->tsfeedp;
 259	if (limit > DMX_MAX_SECFEED_SIZE)
 260		return -1;	/* internal error should never happen */
 261
 262	/* to be sure always set secbuf */
 263	sec->secbuf = sec->secbuf_base + sec->secbufp;
 264
 265	while (sec->secbufp + 2 < limit) {
 266		seclen = section_length(sec->secbuf);
 267		if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE
 268		    || seclen + sec->secbufp > limit)
 269			return 0;
 270		sec->seclen = seclen;
 271		sec->crc_val = ~0;
 272		/* dump [secbuf .. secbuf+seclen) */
 273		if (feed->pusi_seen) {
 274			dvb_dmx_swfilter_section_feed(feed);
 275		} else {
 276			set_buf_flags(feed,
 277				      DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
 278			dprintk_sect_loss("pusi not seen, discarding section data\n");
 279		}
 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
 287static 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		if (dc_i) {
 313			set_buf_flags(feed,
 314				      DMX_BUFFER_FLAG_DISCONTINUITY_INDICATOR);
 315			dprintk_sect_loss("%d frame with disconnect indicator\n",
 316				cc);
 317		} else {
 318			set_buf_flags(feed,
 319				      DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
 320			dprintk_sect_loss("discontinuity: %d instead of %d. %d bytes lost\n",
 321				cc, (feed->cc + 1) & 0x0f, count + 4);
 322		}
 323		/*
 324		 * those bytes under some circumstances will again be reported
 325		 * in the following dvb_dmx_swfilter_section_new
 326		 */
 327
 328		/*
 329		 * Discontinuity detected. Reset pusi_seen to
 330		 * stop feeding of suspicious data until next PUSI=1 arrives
 331		 *
 332		 * FIXME: does it make sense if the MPEG-TS is the one
 333		 *	reporting discontinuity?
 334		 */
 335
 336		feed->pusi_seen = false;
 337		dvb_dmx_swfilter_section_new(feed);
 338	}
 
 339
 340	if (buf[1] & 0x40) {
 341		/* PUSI=1 (is set), section boundary is here */
 342		if (count > 1 && buf[p] < count) {
 343			const u8 *before = &buf[p + 1];
 344			u8 before_len = buf[p];
 345			const u8 *after = &before[before_len];
 346			u8 after_len = count - 1 - before_len;
 347
 348			dvb_dmx_swfilter_section_copy_dump(feed, before,
 349							   before_len);
 350			/* before start of new section, set pusi_seen */
 351			feed->pusi_seen = true;
 352			dvb_dmx_swfilter_section_new(feed);
 353			dvb_dmx_swfilter_section_copy_dump(feed, after,
 354							   after_len);
 355		} else if (count > 0) {
 356			set_buf_flags(feed,
 357				      DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
 358			dprintk_sect_loss("PUSI=1 but %d bytes lost\n", count);
 359		}
 360	} else {
 361		/* PUSI=0 (is not set), no section boundary */
 362		dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count);
 363	}
 364
 365	return 0;
 366}
 367
 368static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed,
 369						const u8 *buf)
 370{
 371	switch (feed->type) {
 372	case DMX_TYPE_TS:
 373		if (!feed->feed.ts.is_filtering)
 374			break;
 375		if (feed->ts_type & TS_PACKET) {
 376			if (feed->ts_type & TS_PAYLOAD_ONLY)
 377				dvb_dmx_swfilter_payload(feed, buf);
 378			else
 379				feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,
 380					    &feed->buffer_flags);
 381		}
 382		/* Used only on full-featured devices */
 383		if (feed->ts_type & TS_DECODER)
 384			if (feed->demux->write_to_decoder)
 385				feed->demux->write_to_decoder(feed, buf, 188);
 386		break;
 387
 388	case DMX_TYPE_SEC:
 389		if (!feed->feed.sec.is_filtering)
 390			break;
 391		if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)
 392			feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;
 393		break;
 394
 395	default:
 396		break;
 397	}
 398}
 399
 400#define DVR_FEED(f)							\
 401	(((f)->type == DMX_TYPE_TS) &&					\
 402	((f)->feed.ts.is_filtering) &&					\
 403	(((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))
 404
 405static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
 406{
 407	struct dvb_demux_feed *feed;
 408	u16 pid = ts_pid(buf);
 409	int dvr_done = 0;
 410
 411	if (dvb_demux_speedcheck) {
 412		ktime_t cur_time;
 413		u64 speed_bytes, speed_timedelta;
 414
 415		demux->speed_pkts_cnt++;
 416
 417		/* show speed every SPEED_PKTS_INTERVAL packets */
 418		if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) {
 419			cur_time = ktime_get();
 420
 421			if (ktime_to_ns(demux->speed_last_time) != 0) {
 422				speed_bytes = (u64)demux->speed_pkts_cnt
 423					* 188 * 8;
 424				/* convert to 1024 basis */
 425				speed_bytes = 1000 * div64_u64(speed_bytes,
 426						1024);
 427				speed_timedelta = ktime_ms_delta(cur_time,
 428							demux->speed_last_time);
 429				if (speed_timedelta)
 430					dprintk("TS speed %llu Kbits/sec \n",
 431						div64_u64(speed_bytes,
 432							  speed_timedelta));
 433			}
 434
 435			demux->speed_last_time = cur_time;
 436			demux->speed_pkts_cnt = 0;
 437		}
 438	}
 439
 440	if (buf[1] & 0x80) {
 441		list_for_each_entry(feed, &demux->feed_list, list_head) {
 442			if ((feed->pid != pid) && (feed->pid != 0x2000))
 443				continue;
 444			set_buf_flags(feed, DMX_BUFFER_FLAG_TEI);
 445		}
 446		dprintk_tscheck("TEI detected. PID=0x%x data1=0x%x\n",
 447				pid, buf[1]);
 448		/* data in this packet can't be trusted - drop it unless
 449		 * module option dvb_demux_feed_err_pkts is set */
 450		if (!dvb_demux_feed_err_pkts)
 451			return;
 452	} else /* if TEI bit is set, pid may be wrong- skip pkt counter */
 453		if (demux->cnt_storage && dvb_demux_tscheck) {
 454			/* check pkt counter */
 455			if (pid < MAX_PID) {
 456				if (buf[3] & 0x10)
 457					demux->cnt_storage[pid] =
 458						(demux->cnt_storage[pid] + 1) & 0xf;
 459
 460				if ((buf[3] & 0xf) != demux->cnt_storage[pid]) {
 461					list_for_each_entry(feed, &demux->feed_list, list_head) {
 462						if ((feed->pid != pid) && (feed->pid != 0x2000))
 463							continue;
 464						set_buf_flags(feed,
 465							      DMX_BUFFER_PKT_COUNTER_MISMATCH);
 466					}
 467
 468					dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n",
 469							pid, demux->cnt_storage[pid],
 470							buf[3] & 0xf);
 471					demux->cnt_storage[pid] = buf[3] & 0xf;
 472				}
 473			}
 474			/* end check */
 475		}
 476
 477	list_for_each_entry(feed, &demux->feed_list, list_head) {
 478		if ((feed->pid != pid) && (feed->pid != 0x2000))
 479			continue;
 480
 481		/* copy each packet only once to the dvr device, even
 482		 * if a PID is in multiple filters (e.g. video + PCR) */
 483		if ((DVR_FEED(feed)) && (dvr_done++))
 484			continue;
 485
 486		if (feed->pid == pid)
 487			dvb_dmx_swfilter_packet_type(feed, buf);
 488		else if (feed->pid == 0x2000)
 489			feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,
 490				    &feed->buffer_flags);
 491	}
 492}
 493
 494void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
 495			      size_t count)
 496{
 497	unsigned long flags;
 498
 499	spin_lock_irqsave(&demux->lock, flags);
 500
 501	while (count--) {
 502		if (buf[0] == 0x47)
 503			dvb_dmx_swfilter_packet(demux, buf);
 504		buf += 188;
 505	}
 506
 507	spin_unlock_irqrestore(&demux->lock, flags);
 508}
 509
 510EXPORT_SYMBOL(dvb_dmx_swfilter_packets);
 511
 512static inline int find_next_packet(const u8 *buf, int pos, size_t count,
 513				   const int pktsize)
 514{
 515	int start = pos, lost;
 516
 517	while (pos < count) {
 518		if (buf[pos] == 0x47 ||
 519		    (pktsize == 204 && buf[pos] == 0xB8))
 520			break;
 521		pos++;
 522	}
 523
 524	lost = pos - start;
 525	if (lost) {
 526		/* This garbage is part of a valid packet? */
 527		int backtrack = pos - pktsize;
 528		if (backtrack >= 0 && (buf[backtrack] == 0x47 ||
 529		    (pktsize == 204 && buf[backtrack] == 0xB8)))
 530			return backtrack;
 531	}
 532
 533	return pos;
 534}
 535
 536/* Filter all pktsize= 188 or 204 sized packets and skip garbage. */
 537static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf,
 538		size_t count, const int pktsize)
 539{
 540	int p = 0, i, j;
 541	const u8 *q;
 542	unsigned long flags;
 543
 544	spin_lock_irqsave(&demux->lock, flags);
 545
 546	if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */
 547		i = demux->tsbufp;
 548		j = pktsize - i;
 549		if (count < j) {
 550			memcpy(&demux->tsbuf[i], buf, count);
 551			demux->tsbufp += count;
 552			goto bailout;
 553		}
 554		memcpy(&demux->tsbuf[i], buf, j);
 555		if (demux->tsbuf[0] == 0x47) /* double check */
 556			dvb_dmx_swfilter_packet(demux, demux->tsbuf);
 557		demux->tsbufp = 0;
 558		p += j;
 559	}
 560
 561	while (1) {
 562		p = find_next_packet(buf, p, count, pktsize);
 563		if (p >= count)
 564			break;
 565		if (count - p < pktsize)
 566			break;
 567
 568		q = &buf[p];
 569
 570		if (pktsize == 204 && (*q == 0xB8)) {
 571			memcpy(demux->tsbuf, q, 188);
 572			demux->tsbuf[0] = 0x47;
 573			q = demux->tsbuf;
 574		}
 575		dvb_dmx_swfilter_packet(demux, q);
 576		p += pktsize;
 577	}
 578
 579	i = count - p;
 580	if (i) {
 581		memcpy(demux->tsbuf, &buf[p], i);
 582		demux->tsbufp = i;
 583		if (pktsize == 204 && demux->tsbuf[0] == 0xB8)
 584			demux->tsbuf[0] = 0x47;
 585	}
 586
 587bailout:
 588	spin_unlock_irqrestore(&demux->lock, flags);
 589}
 590
 591void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)
 592{
 593	_dvb_dmx_swfilter(demux, buf, count, 188);
 594}
 595EXPORT_SYMBOL(dvb_dmx_swfilter);
 596
 597void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)
 598{
 599	_dvb_dmx_swfilter(demux, buf, count, 204);
 600}
 601EXPORT_SYMBOL(dvb_dmx_swfilter_204);
 602
 603void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count)
 604{
 605	unsigned long flags;
 606
 607	spin_lock_irqsave(&demux->lock, flags);
 608
 609	demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts,
 610			   &demux->feed->buffer_flags);
 611
 612	spin_unlock_irqrestore(&demux->lock, flags);
 613}
 614EXPORT_SYMBOL(dvb_dmx_swfilter_raw);
 615
 616static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)
 617{
 618	int i;
 619
 620	for (i = 0; i < demux->filternum; i++)
 621		if (demux->filter[i].state == DMX_STATE_FREE)
 622			break;
 623
 624	if (i == demux->filternum)
 625		return NULL;
 626
 627	demux->filter[i].state = DMX_STATE_ALLOCATED;
 628
 629	return &demux->filter[i];
 630}
 631
 632static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)
 633{
 634	int i;
 635
 636	for (i = 0; i < demux->feednum; i++)
 637		if (demux->feed[i].state == DMX_STATE_FREE)
 638			break;
 639
 640	if (i == demux->feednum)
 641		return NULL;
 642
 643	demux->feed[i].state = DMX_STATE_ALLOCATED;
 644
 645	return &demux->feed[i];
 646}
 647
 648static int dvb_demux_feed_find(struct dvb_demux_feed *feed)
 649{
 650	struct dvb_demux_feed *entry;
 651
 652	list_for_each_entry(entry, &feed->demux->feed_list, list_head)
 653		if (entry == feed)
 654			return 1;
 655
 656	return 0;
 657}
 658
 659static void dvb_demux_feed_add(struct dvb_demux_feed *feed)
 660{
 661	spin_lock_irq(&feed->demux->lock);
 662	if (dvb_demux_feed_find(feed)) {
 663		pr_err("%s: feed already in list (type=%x state=%x pid=%x)\n",
 664		       __func__, feed->type, feed->state, feed->pid);
 665		goto out;
 666	}
 667
 668	list_add(&feed->list_head, &feed->demux->feed_list);
 669out:
 670	spin_unlock_irq(&feed->demux->lock);
 671}
 672
 673static void dvb_demux_feed_del(struct dvb_demux_feed *feed)
 674{
 675	spin_lock_irq(&feed->demux->lock);
 676	if (!(dvb_demux_feed_find(feed))) {
 677		pr_err("%s: feed not in list (type=%x state=%x pid=%x)\n",
 678		       __func__, feed->type, feed->state, feed->pid);
 679		goto out;
 680	}
 681
 682	list_del(&feed->list_head);
 683out:
 684	spin_unlock_irq(&feed->demux->lock);
 685}
 686
 687static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,
 688			   enum dmx_ts_pes pes_type, ktime_t timeout)
 689{
 690	struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 691	struct dvb_demux *demux = feed->demux;
 692
 693	if (pid > DMX_MAX_PID)
 694		return -EINVAL;
 695
 696	if (mutex_lock_interruptible(&demux->mutex))
 697		return -ERESTARTSYS;
 698
 699	if (ts_type & TS_DECODER) {
 700		if (pes_type >= DMX_PES_OTHER) {
 701			mutex_unlock(&demux->mutex);
 702			return -EINVAL;
 703		}
 704
 705		if (demux->pesfilter[pes_type] &&
 706		    demux->pesfilter[pes_type] != feed) {
 707			mutex_unlock(&demux->mutex);
 708			return -EINVAL;
 709		}
 710
 711		demux->pesfilter[pes_type] = feed;
 712		demux->pids[pes_type] = pid;
 713	}
 714
 715	dvb_demux_feed_add(feed);
 716
 717	feed->pid = pid;
 718	feed->timeout = timeout;
 719	feed->ts_type = ts_type;
 720	feed->pes_type = pes_type;
 721
 722	feed->state = DMX_STATE_READY;
 723	mutex_unlock(&demux->mutex);
 724
 725	return 0;
 726}
 727
 728static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)
 729{
 730	struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 731	struct dvb_demux *demux = feed->demux;
 732	int ret;
 733
 734	if (mutex_lock_interruptible(&demux->mutex))
 735		return -ERESTARTSYS;
 736
 737	if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {
 738		mutex_unlock(&demux->mutex);
 739		return -EINVAL;
 740	}
 741
 742	if (!demux->start_feed) {
 743		mutex_unlock(&demux->mutex);
 744		return -ENODEV;
 745	}
 746
 747	if ((ret = demux->start_feed(feed)) < 0) {
 748		mutex_unlock(&demux->mutex);
 749		return ret;
 750	}
 751
 752	spin_lock_irq(&demux->lock);
 753	ts_feed->is_filtering = 1;
 754	feed->state = DMX_STATE_GO;
 755	spin_unlock_irq(&demux->lock);
 756	mutex_unlock(&demux->mutex);
 757
 758	return 0;
 759}
 760
 761static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)
 762{
 763	struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 764	struct dvb_demux *demux = feed->demux;
 765	int ret;
 766
 767	mutex_lock(&demux->mutex);
 768
 769	if (feed->state < DMX_STATE_GO) {
 770		mutex_unlock(&demux->mutex);
 771		return -EINVAL;
 772	}
 773
 774	if (!demux->stop_feed) {
 775		mutex_unlock(&demux->mutex);
 776		return -ENODEV;
 777	}
 778
 779	ret = demux->stop_feed(feed);
 780
 781	spin_lock_irq(&demux->lock);
 782	ts_feed->is_filtering = 0;
 783	feed->state = DMX_STATE_ALLOCATED;
 784	spin_unlock_irq(&demux->lock);
 785	mutex_unlock(&demux->mutex);
 786
 787	return ret;
 788}
 789
 790static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,
 791				   struct dmx_ts_feed **ts_feed,
 792				   dmx_ts_cb callback)
 793{
 794	struct dvb_demux *demux = (struct dvb_demux *)dmx;
 795	struct dvb_demux_feed *feed;
 796
 797	if (mutex_lock_interruptible(&demux->mutex))
 798		return -ERESTARTSYS;
 799
 800	if (!(feed = dvb_dmx_feed_alloc(demux))) {
 801		mutex_unlock(&demux->mutex);
 802		return -EBUSY;
 803	}
 804
 805	feed->type = DMX_TYPE_TS;
 806	feed->cb.ts = callback;
 807	feed->demux = demux;
 808	feed->pid = 0xffff;
 809	feed->peslen = 0xfffa;
 810	feed->buffer_flags = 0;
 811
 812	(*ts_feed) = &feed->feed.ts;
 813	(*ts_feed)->parent = dmx;
 814	(*ts_feed)->priv = NULL;
 815	(*ts_feed)->is_filtering = 0;
 816	(*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;
 817	(*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;
 818	(*ts_feed)->set = dmx_ts_feed_set;
 819
 820	if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {
 821		feed->state = DMX_STATE_FREE;
 822		mutex_unlock(&demux->mutex);
 823		return -EBUSY;
 824	}
 825
 826	feed->filter->type = DMX_TYPE_TS;
 827	feed->filter->feed = feed;
 828	feed->filter->state = DMX_STATE_READY;
 829
 830	mutex_unlock(&demux->mutex);
 831
 832	return 0;
 833}
 834
 835static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,
 836				  struct dmx_ts_feed *ts_feed)
 837{
 838	struct dvb_demux *demux = (struct dvb_demux *)dmx;
 839	struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;
 840
 841	mutex_lock(&demux->mutex);
 842
 843	if (feed->state == DMX_STATE_FREE) {
 844		mutex_unlock(&demux->mutex);
 845		return -EINVAL;
 846	}
 847
 848	feed->state = DMX_STATE_FREE;
 849	feed->filter->state = DMX_STATE_FREE;
 850
 851	dvb_demux_feed_del(feed);
 852
 853	feed->pid = 0xffff;
 854
 855	if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER)
 856		demux->pesfilter[feed->pes_type] = NULL;
 857
 858	mutex_unlock(&demux->mutex);
 859	return 0;
 860}
 861
 862/******************************************************************************
 863 * dmx_section_feed API calls
 864 ******************************************************************************/
 865
 866static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,
 867					    struct dmx_section_filter **filter)
 868{
 869	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 870	struct dvb_demux *dvbdemux = dvbdmxfeed->demux;
 871	struct dvb_demux_filter *dvbdmxfilter;
 872
 873	if (mutex_lock_interruptible(&dvbdemux->mutex))
 874		return -ERESTARTSYS;
 875
 876	dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);
 877	if (!dvbdmxfilter) {
 878		mutex_unlock(&dvbdemux->mutex);
 879		return -EBUSY;
 880	}
 881
 882	spin_lock_irq(&dvbdemux->lock);
 883	*filter = &dvbdmxfilter->filter;
 884	(*filter)->parent = feed;
 885	(*filter)->priv = NULL;
 886	dvbdmxfilter->feed = dvbdmxfeed;
 887	dvbdmxfilter->type = DMX_TYPE_SEC;
 888	dvbdmxfilter->state = DMX_STATE_READY;
 889	dvbdmxfilter->next = dvbdmxfeed->filter;
 890	dvbdmxfeed->filter = dvbdmxfilter;
 891	spin_unlock_irq(&dvbdemux->lock);
 892
 893	mutex_unlock(&dvbdemux->mutex);
 894	return 0;
 895}
 896
 897static int dmx_section_feed_set(struct dmx_section_feed *feed,
 898				u16 pid, int check_crc)
 899{
 900	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 901	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 902
 903	if (pid > 0x1fff)
 904		return -EINVAL;
 905
 906	if (mutex_lock_interruptible(&dvbdmx->mutex))
 907		return -ERESTARTSYS;
 908
 909	dvb_demux_feed_add(dvbdmxfeed);
 910
 911	dvbdmxfeed->pid = pid;
 912	dvbdmxfeed->feed.sec.check_crc = check_crc;
 913
 914	dvbdmxfeed->state = DMX_STATE_READY;
 915	mutex_unlock(&dvbdmx->mutex);
 916	return 0;
 917}
 918
 919static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)
 920{
 921	int i;
 922	struct dvb_demux_filter *f;
 923	struct dmx_section_filter *sf;
 924	u8 mask, mode, doneq;
 925
 926	if (!(f = dvbdmxfeed->filter))
 927		return;
 928	do {
 929		sf = &f->filter;
 930		doneq = false;
 931		for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {
 932			mode = sf->filter_mode[i];
 933			mask = sf->filter_mask[i];
 934			f->maskandmode[i] = mask & mode;
 935			doneq |= f->maskandnotmode[i] = mask & ~mode;
 936		}
 937		f->doneq = doneq ? true : false;
 938	} while ((f = f->next));
 939}
 940
 941static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)
 942{
 943	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 944	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 945	int ret;
 946
 947	if (mutex_lock_interruptible(&dvbdmx->mutex))
 948		return -ERESTARTSYS;
 949
 950	if (feed->is_filtering) {
 951		mutex_unlock(&dvbdmx->mutex);
 952		return -EBUSY;
 953	}
 954
 955	if (!dvbdmxfeed->filter) {
 956		mutex_unlock(&dvbdmx->mutex);
 957		return -EINVAL;
 958	}
 959
 960	dvbdmxfeed->feed.sec.tsfeedp = 0;
 961	dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
 962	dvbdmxfeed->feed.sec.secbufp = 0;
 963	dvbdmxfeed->feed.sec.seclen = 0;
 964	dvbdmxfeed->pusi_seen = false;
 965
 966	if (!dvbdmx->start_feed) {
 967		mutex_unlock(&dvbdmx->mutex);
 968		return -ENODEV;
 969	}
 970
 971	prepare_secfilters(dvbdmxfeed);
 972
 973	if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {
 974		mutex_unlock(&dvbdmx->mutex);
 975		return ret;
 976	}
 977
 978	spin_lock_irq(&dvbdmx->lock);
 979	feed->is_filtering = 1;
 980	dvbdmxfeed->state = DMX_STATE_GO;
 981	spin_unlock_irq(&dvbdmx->lock);
 982
 983	mutex_unlock(&dvbdmx->mutex);
 984	return 0;
 985}
 986
 987static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)
 988{
 989	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
 990	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 991	int ret;
 992
 993	mutex_lock(&dvbdmx->mutex);
 994
 995	if (!dvbdmx->stop_feed) {
 996		mutex_unlock(&dvbdmx->mutex);
 997		return -ENODEV;
 998	}
 999
1000	ret = dvbdmx->stop_feed(dvbdmxfeed);
1001
1002	spin_lock_irq(&dvbdmx->lock);
1003	dvbdmxfeed->state = DMX_STATE_READY;
1004	feed->is_filtering = 0;
1005	spin_unlock_irq(&dvbdmx->lock);
1006
1007	mutex_unlock(&dvbdmx->mutex);
1008	return ret;
1009}
1010
1011static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,
1012					   struct dmx_section_filter *filter)
1013{
1014	struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;
1015	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1016	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
1017
1018	mutex_lock(&dvbdmx->mutex);
1019
1020	if (dvbdmxfilter->feed != dvbdmxfeed) {
1021		mutex_unlock(&dvbdmx->mutex);
1022		return -EINVAL;
1023	}
1024
1025	if (feed->is_filtering) {
1026		/* release dvbdmx->mutex as far as it is
1027		   acquired by stop_filtering() itself */
1028		mutex_unlock(&dvbdmx->mutex);
1029		feed->stop_filtering(feed);
1030		mutex_lock(&dvbdmx->mutex);
1031	}
1032
1033	spin_lock_irq(&dvbdmx->lock);
1034	f = dvbdmxfeed->filter;
1035
1036	if (f == dvbdmxfilter) {
1037		dvbdmxfeed->filter = dvbdmxfilter->next;
1038	} else {
1039		while (f->next != dvbdmxfilter)
1040			f = f->next;
1041		f->next = f->next->next;
1042	}
1043
1044	dvbdmxfilter->state = DMX_STATE_FREE;
1045	spin_unlock_irq(&dvbdmx->lock);
1046	mutex_unlock(&dvbdmx->mutex);
1047	return 0;
1048}
1049
1050static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,
1051					struct dmx_section_feed **feed,
1052					dmx_section_cb callback)
1053{
1054	struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1055	struct dvb_demux_feed *dvbdmxfeed;
1056
1057	if (mutex_lock_interruptible(&dvbdmx->mutex))
1058		return -ERESTARTSYS;
1059
1060	if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {
1061		mutex_unlock(&dvbdmx->mutex);
1062		return -EBUSY;
1063	}
1064
1065	dvbdmxfeed->type = DMX_TYPE_SEC;
1066	dvbdmxfeed->cb.sec = callback;
1067	dvbdmxfeed->demux = dvbdmx;
1068	dvbdmxfeed->pid = 0xffff;
1069	dvbdmxfeed->buffer_flags = 0;
1070	dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;
1071	dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;
1072	dvbdmxfeed->feed.sec.tsfeedp = 0;
1073	dvbdmxfeed->filter = NULL;
1074
1075	(*feed) = &dvbdmxfeed->feed.sec;
1076	(*feed)->is_filtering = 0;
1077	(*feed)->parent = demux;
1078	(*feed)->priv = NULL;
1079
1080	(*feed)->set = dmx_section_feed_set;
1081	(*feed)->allocate_filter = dmx_section_feed_allocate_filter;
1082	(*feed)->start_filtering = dmx_section_feed_start_filtering;
1083	(*feed)->stop_filtering = dmx_section_feed_stop_filtering;
1084	(*feed)->release_filter = dmx_section_feed_release_filter;
1085
1086	mutex_unlock(&dvbdmx->mutex);
1087	return 0;
1088}
1089
1090static int dvbdmx_release_section_feed(struct dmx_demux *demux,
1091				       struct dmx_section_feed *feed)
1092{
1093	struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;
1094	struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;
1095
1096	mutex_lock(&dvbdmx->mutex);
1097
1098	if (dvbdmxfeed->state == DMX_STATE_FREE) {
1099		mutex_unlock(&dvbdmx->mutex);
1100		return -EINVAL;
1101	}
1102	dvbdmxfeed->state = DMX_STATE_FREE;
1103
1104	dvb_demux_feed_del(dvbdmxfeed);
1105
1106	dvbdmxfeed->pid = 0xffff;
1107
1108	mutex_unlock(&dvbdmx->mutex);
1109	return 0;
1110}
1111
1112/******************************************************************************
1113 * dvb_demux kernel data API calls
1114 ******************************************************************************/
1115
1116static int dvbdmx_open(struct dmx_demux *demux)
1117{
1118	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1119
1120	if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)
1121		return -EUSERS;
1122
1123	dvbdemux->users++;
1124	return 0;
1125}
1126
1127static int dvbdmx_close(struct dmx_demux *demux)
1128{
1129	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1130
1131	if (dvbdemux->users == 0)
1132		return -ENODEV;
1133
1134	dvbdemux->users--;
1135	//FIXME: release any unneeded resources if users==0
1136	return 0;
1137}
1138
1139static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
1140{
1141	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1142	void *p;
1143
1144	if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
1145		return -EINVAL;
1146
1147	p = memdup_user(buf, count);
1148	if (IS_ERR(p))
1149		return PTR_ERR(p);
1150	if (mutex_lock_interruptible(&dvbdemux->mutex)) {
1151		kfree(p);
1152		return -ERESTARTSYS;
1153	}
1154	dvb_dmx_swfilter(dvbdemux, p, count);
1155	kfree(p);
1156	mutex_unlock(&dvbdemux->mutex);
1157
1158	if (signal_pending(current))
1159		return -EINTR;
1160	return count;
1161}
1162
1163static int dvbdmx_add_frontend(struct dmx_demux *demux,
1164			       struct dmx_frontend *frontend)
1165{
1166	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1167	struct list_head *head = &dvbdemux->frontend_list;
1168
1169	list_add(&(frontend->connectivity_list), head);
1170
1171	return 0;
1172}
1173
1174static int dvbdmx_remove_frontend(struct dmx_demux *demux,
1175				  struct dmx_frontend *frontend)
1176{
1177	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1178	struct list_head *pos, *n, *head = &dvbdemux->frontend_list;
1179
1180	list_for_each_safe(pos, n, head) {
1181		if (DMX_FE_ENTRY(pos) == frontend) {
1182			list_del(pos);
1183			return 0;
1184		}
1185	}
1186
1187	return -ENODEV;
1188}
1189
1190static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)
1191{
1192	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1193
1194	if (list_empty(&dvbdemux->frontend_list))
1195		return NULL;
1196
1197	return &dvbdemux->frontend_list;
1198}
1199
1200static int dvbdmx_connect_frontend(struct dmx_demux *demux,
1201				   struct dmx_frontend *frontend)
1202{
1203	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1204
1205	if (demux->frontend)
1206		return -EINVAL;
1207
1208	mutex_lock(&dvbdemux->mutex);
1209
1210	demux->frontend = frontend;
1211	mutex_unlock(&dvbdemux->mutex);
1212	return 0;
1213}
1214
1215static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)
1216{
1217	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1218
1219	mutex_lock(&dvbdemux->mutex);
1220
1221	demux->frontend = NULL;
1222	mutex_unlock(&dvbdemux->mutex);
1223	return 0;
1224}
1225
1226static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)
1227{
1228	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
1229
1230	memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));
1231	return 0;
1232}
1233
1234int dvb_dmx_init(struct dvb_demux *dvbdemux)
1235{
1236	int i;
1237	struct dmx_demux *dmx = &dvbdemux->dmx;
1238
1239	dvbdemux->cnt_storage = NULL;
1240	dvbdemux->users = 0;
1241	dvbdemux->filter = vmalloc(array_size(sizeof(struct dvb_demux_filter),
1242					      dvbdemux->filternum));
1243
1244	if (!dvbdemux->filter)
1245		return -ENOMEM;
1246
1247	dvbdemux->feed = vmalloc(array_size(sizeof(struct dvb_demux_feed),
1248					    dvbdemux->feednum));
1249	if (!dvbdemux->feed) {
1250		vfree(dvbdemux->filter);
1251		dvbdemux->filter = NULL;
1252		return -ENOMEM;
1253	}
1254	for (i = 0; i < dvbdemux->filternum; i++) {
1255		dvbdemux->filter[i].state = DMX_STATE_FREE;
1256		dvbdemux->filter[i].index = i;
1257	}
1258	for (i = 0; i < dvbdemux->feednum; i++) {
1259		dvbdemux->feed[i].state = DMX_STATE_FREE;
1260		dvbdemux->feed[i].index = i;
1261	}
1262
1263	dvbdemux->cnt_storage = vmalloc(MAX_PID + 1);
1264	if (!dvbdemux->cnt_storage)
1265		pr_warn("Couldn't allocate memory for TS/TEI check. Disabling it\n");
1266
1267	INIT_LIST_HEAD(&dvbdemux->frontend_list);
1268
1269	for (i = 0; i < DMX_PES_OTHER; i++) {
1270		dvbdemux->pesfilter[i] = NULL;
1271		dvbdemux->pids[i] = 0xffff;
1272	}
1273
1274	INIT_LIST_HEAD(&dvbdemux->feed_list);
1275
1276	dvbdemux->playing = 0;
1277	dvbdemux->recording = 0;
1278	dvbdemux->tsbufp = 0;
1279
1280	if (!dvbdemux->check_crc32)
1281		dvbdemux->check_crc32 = dvb_dmx_crc32;
1282
1283	if (!dvbdemux->memcopy)
1284		dvbdemux->memcopy = dvb_dmx_memcopy;
1285
1286	dmx->frontend = NULL;
1287	dmx->priv = dvbdemux;
1288	dmx->open = dvbdmx_open;
1289	dmx->close = dvbdmx_close;
1290	dmx->write = dvbdmx_write;
1291	dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;
1292	dmx->release_ts_feed = dvbdmx_release_ts_feed;
1293	dmx->allocate_section_feed = dvbdmx_allocate_section_feed;
1294	dmx->release_section_feed = dvbdmx_release_section_feed;
1295
1296	dmx->add_frontend = dvbdmx_add_frontend;
1297	dmx->remove_frontend = dvbdmx_remove_frontend;
1298	dmx->get_frontends = dvbdmx_get_frontends;
1299	dmx->connect_frontend = dvbdmx_connect_frontend;
1300	dmx->disconnect_frontend = dvbdmx_disconnect_frontend;
1301	dmx->get_pes_pids = dvbdmx_get_pes_pids;
1302
1303	mutex_init(&dvbdemux->mutex);
1304	spin_lock_init(&dvbdemux->lock);
1305
1306	return 0;
1307}
1308
1309EXPORT_SYMBOL(dvb_dmx_init);
1310
1311void dvb_dmx_release(struct dvb_demux *dvbdemux)
1312{
1313	vfree(dvbdemux->cnt_storage);
1314	vfree(dvbdemux->filter);
1315	vfree(dvbdemux->feed);
1316}
1317
1318EXPORT_SYMBOL(dvb_dmx_release);