xref: /openbmc/linux/drivers/media/dvb-core/dvb_demux.c (revision ae3473231e77a3f1909d48cd144cebe5e1d049b3)
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);
1290