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19#include <linux/usb.h>
20#include <linux/gfp.h>
21
22#include "usb_stream.h"
23
24
25
26
27static unsigned usb_stream_next_packet_size(struct usb_stream_kernel *sk)
28{
29 struct usb_stream *s = sk->s;
30 sk->out_phase_peeked = (sk->out_phase & 0xffff) + sk->freqn;
31 return (sk->out_phase_peeked >> 16) * s->cfg.frame_size;
32}
33
34static void playback_prep_freqn(struct usb_stream_kernel *sk, struct urb *urb)
35{
36 struct usb_stream *s = sk->s;
37 int pack, lb = 0;
38
39 for (pack = 0; pack < sk->n_o_ps; pack++) {
40 int l = usb_stream_next_packet_size(sk);
41 if (s->idle_outsize + lb + l > s->period_size)
42 goto check;
43
44 sk->out_phase = sk->out_phase_peeked;
45 urb->iso_frame_desc[pack].offset = lb;
46 urb->iso_frame_desc[pack].length = l;
47 lb += l;
48 }
49 snd_printdd(KERN_DEBUG "%i\n", lb);
50
51check:
52 urb->number_of_packets = pack;
53 urb->transfer_buffer_length = lb;
54 s->idle_outsize += lb - s->period_size;
55 snd_printdd(KERN_DEBUG "idle=%i ul=%i ps=%i\n", s->idle_outsize,
56 lb, s->period_size);
57}
58
59static void init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
60 struct urb **urbs, char *transfer,
61 struct usb_device *dev, int pipe)
62{
63 int u, p;
64 int maxpacket = use_packsize ?
65 use_packsize : usb_maxpacket(dev, pipe, usb_pipeout(pipe));
66 int transfer_length = maxpacket * sk->n_o_ps;
67
68 for (u = 0; u < USB_STREAM_NURBS;
69 ++u, transfer += transfer_length) {
70 struct urb *urb = urbs[u];
71 struct usb_iso_packet_descriptor *desc;
72 urb->transfer_flags = URB_ISO_ASAP;
73 urb->transfer_buffer = transfer;
74 urb->dev = dev;
75 urb->pipe = pipe;
76 urb->number_of_packets = sk->n_o_ps;
77 urb->context = sk;
78 urb->interval = 1;
79 if (usb_pipeout(pipe))
80 continue;
81
82 urb->transfer_buffer_length = transfer_length;
83 desc = urb->iso_frame_desc;
84 desc->offset = 0;
85 desc->length = maxpacket;
86 for (p = 1; p < sk->n_o_ps; ++p) {
87 desc[p].offset = desc[p - 1].offset + maxpacket;
88 desc[p].length = maxpacket;
89 }
90 }
91}
92
93static void init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
94 struct usb_device *dev, int in_pipe, int out_pipe)
95{
96 struct usb_stream *s = sk->s;
97 char *indata = (char *)s + sizeof(*s) +
98 sizeof(struct usb_stream_packet) *
99 s->inpackets;
100 int u;
101
102 for (u = 0; u < USB_STREAM_NURBS; ++u) {
103 sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
104 sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
105 }
106
107 init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe);
108 init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev,
109 out_pipe);
110}
111
112
113
114
115
116
117static inline unsigned get_usb_full_speed_rate(unsigned rate)
118{
119 return ((rate << 13) + 62) / 125;
120}
121
122
123
124
125
126static inline unsigned get_usb_high_speed_rate(unsigned rate)
127{
128 return ((rate << 10) + 62) / 125;
129}
130
131void usb_stream_free(struct usb_stream_kernel *sk)
132{
133 struct usb_stream *s;
134 unsigned u;
135
136 for (u = 0; u < USB_STREAM_NURBS; ++u) {
137 usb_free_urb(sk->inurb[u]);
138 sk->inurb[u] = NULL;
139 usb_free_urb(sk->outurb[u]);
140 sk->outurb[u] = NULL;
141 }
142
143 s = sk->s;
144 if (!s)
145 return;
146
147 free_pages((unsigned long)sk->write_page, get_order(s->write_size));
148 sk->write_page = NULL;
149 free_pages((unsigned long)s, get_order(s->read_size));
150 sk->s = NULL;
151}
152
153struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
154 struct usb_device *dev,
155 unsigned in_endpoint, unsigned out_endpoint,
156 unsigned sample_rate, unsigned use_packsize,
157 unsigned period_frames, unsigned frame_size)
158{
159 int packets, max_packsize;
160 int in_pipe, out_pipe;
161 int read_size = sizeof(struct usb_stream);
162 int write_size;
163 int usb_frames = dev->speed == USB_SPEED_HIGH ? 8000 : 1000;
164 int pg;
165
166 in_pipe = usb_rcvisocpipe(dev, in_endpoint);
167 out_pipe = usb_sndisocpipe(dev, out_endpoint);
168
169 max_packsize = use_packsize ?
170 use_packsize : usb_maxpacket(dev, in_pipe, 0);
171
172
173
174
175
176
177
178 packets = period_frames * usb_frames / sample_rate + 1;
179
180 if (dev->speed == USB_SPEED_HIGH)
181 packets = (packets + 7) & ~7;
182
183 read_size += packets * USB_STREAM_URBDEPTH *
184 (max_packsize + sizeof(struct usb_stream_packet));
185
186 max_packsize = usb_maxpacket(dev, out_pipe, 1);
187 write_size = max_packsize * packets * USB_STREAM_URBDEPTH;
188
189 if (read_size >= 256*PAGE_SIZE || write_size >= 256*PAGE_SIZE) {
190 snd_printk(KERN_WARNING "a size exceeds 128*PAGE_SIZE\n");
191 goto out;
192 }
193
194 pg = get_order(read_size);
195 sk->s = (void *) __get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg);
196 if (!sk->s) {
197 snd_printk(KERN_WARNING "couldn't __get_free_pages()\n");
198 goto out;
199 }
200 sk->s->cfg.version = USB_STREAM_INTERFACE_VERSION;
201
202 sk->s->read_size = read_size;
203
204 sk->s->cfg.sample_rate = sample_rate;
205 sk->s->cfg.frame_size = frame_size;
206 sk->n_o_ps = packets;
207 sk->s->inpackets = packets * USB_STREAM_URBDEPTH;
208 sk->s->cfg.period_frames = period_frames;
209 sk->s->period_size = frame_size * period_frames;
210
211 sk->s->write_size = write_size;
212 pg = get_order(write_size);
213
214 sk->write_page =
215 (void *)__get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg);
216 if (!sk->write_page) {
217 snd_printk(KERN_WARNING "couldn't __get_free_pages()\n");
218 usb_stream_free(sk);
219 return NULL;
220 }
221
222
223 if (dev->speed == USB_SPEED_FULL)
224 sk->freqn = get_usb_full_speed_rate(sample_rate);
225 else
226 sk->freqn = get_usb_high_speed_rate(sample_rate);
227
228 init_urbs(sk, use_packsize, dev, in_pipe, out_pipe);
229 sk->s->state = usb_stream_stopped;
230out:
231 return sk->s;
232}
233
234
235
236
237static bool balance_check(struct usb_stream_kernel *sk, struct urb *urb)
238{
239 bool r;
240 if (unlikely(urb->status)) {
241 if (urb->status != -ESHUTDOWN && urb->status != -ENOENT)
242 snd_printk(KERN_WARNING "status=%i\n", urb->status);
243 sk->iso_frame_balance = 0x7FFFFFFF;
244 return false;
245 }
246 r = sk->iso_frame_balance == 0;
247 if (!r)
248 sk->i_urb = urb;
249 return r;
250}
251
252static bool balance_playback(struct usb_stream_kernel *sk, struct urb *urb)
253{
254 sk->iso_frame_balance += urb->number_of_packets;
255 return balance_check(sk, urb);
256}
257
258static bool balance_capture(struct usb_stream_kernel *sk, struct urb *urb)
259{
260 sk->iso_frame_balance -= urb->number_of_packets;
261 return balance_check(sk, urb);
262}
263
264static void subs_set_complete(struct urb **urbs, void (*complete)(struct urb *))
265{
266 int u;
267
268 for (u = 0; u < USB_STREAM_NURBS; u++) {
269 struct urb *urb = urbs[u];
270 urb->complete = complete;
271 }
272}
273
274static int usb_stream_prepare_playback(struct usb_stream_kernel *sk,
275 struct urb *inurb)
276{
277 struct usb_stream *s = sk->s;
278 struct urb *io;
279 struct usb_iso_packet_descriptor *id, *od;
280 int p = 0, lb = 0, l = 0;
281
282 io = sk->idle_outurb;
283 od = io->iso_frame_desc;
284
285 for (; s->sync_packet < 0; ++p, ++s->sync_packet) {
286 struct urb *ii = sk->completed_inurb;
287 id = ii->iso_frame_desc +
288 ii->number_of_packets + s->sync_packet;
289 l = id->actual_length;
290
291 od[p].length = l;
292 od[p].offset = lb;
293 lb += l;
294 }
295
296 for (;
297 s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps;
298 ++p, ++s->sync_packet) {
299 l = inurb->iso_frame_desc[s->sync_packet].actual_length;
300
301 if (s->idle_outsize + lb + l > s->period_size)
302 goto check_ok;
303
304 od[p].length = l;
305 od[p].offset = lb;
306 lb += l;
307 }
308
309check_ok:
310 s->sync_packet -= inurb->number_of_packets;
311 if (unlikely(s->sync_packet < -2 || s->sync_packet > 0)) {
312 snd_printk(KERN_WARNING "invalid sync_packet = %i;"
313 " p=%i nop=%i %i %x %x %x > %x\n",
314 s->sync_packet, p, inurb->number_of_packets,
315 s->idle_outsize + lb + l,
316 s->idle_outsize, lb, l,
317 s->period_size);
318 return -1;
319 }
320 if (unlikely(lb % s->cfg.frame_size)) {
321 snd_printk(KERN_WARNING"invalid outsize = %i\n",
322 lb);
323 return -1;
324 }
325 s->idle_outsize += lb - s->period_size;
326 io->number_of_packets = p;
327 io->transfer_buffer_length = lb;
328 if (s->idle_outsize <= 0)
329 return 0;
330
331 snd_printk(KERN_WARNING "idle=%i\n", s->idle_outsize);
332 return -1;
333}
334
335static void prepare_inurb(int number_of_packets, struct urb *iu)
336{
337 struct usb_iso_packet_descriptor *id;
338 int p;
339
340 iu->number_of_packets = number_of_packets;
341 id = iu->iso_frame_desc;
342 id->offset = 0;
343 for (p = 0; p < iu->number_of_packets - 1; ++p)
344 id[p + 1].offset = id[p].offset + id[p].length;
345
346 iu->transfer_buffer_length =
347 id[0].length * iu->number_of_packets;
348}
349
350static int submit_urbs(struct usb_stream_kernel *sk,
351 struct urb *inurb, struct urb *outurb)
352{
353 int err;
354 prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb);
355 err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC);
356 if (err < 0) {
357 snd_printk(KERN_ERR "%i\n", err);
358 return err;
359 }
360 sk->idle_inurb = sk->completed_inurb;
361 sk->completed_inurb = inurb;
362 err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC);
363 if (err < 0) {
364 snd_printk(KERN_ERR "%i\n", err);
365 return err;
366 }
367 sk->idle_outurb = sk->completed_outurb;
368 sk->completed_outurb = outurb;
369 return 0;
370}
371
372#ifdef DEBUG_LOOP_BACK
373
374
375
376static void loop_back(struct usb_stream *s)
377{
378 char *i, *o;
379 int il, ol, l, p;
380 struct urb *iu;
381 struct usb_iso_packet_descriptor *id;
382
383 o = s->playback1st_to;
384 ol = s->playback1st_size;
385 l = 0;
386
387 if (s->insplit_pack >= 0) {
388 iu = sk->idle_inurb;
389 id = iu->iso_frame_desc;
390 p = s->insplit_pack;
391 } else
392 goto second;
393loop:
394 for (; p < iu->number_of_packets && l < s->period_size; ++p) {
395 i = iu->transfer_buffer + id[p].offset;
396 il = id[p].actual_length;
397 if (l + il > s->period_size)
398 il = s->period_size - l;
399 if (il <= ol) {
400 memcpy(o, i, il);
401 o += il;
402 ol -= il;
403 } else {
404 memcpy(o, i, ol);
405 singen_6pack(o, ol);
406 o = s->playback_to;
407 memcpy(o, i + ol, il - ol);
408 o += il - ol;
409 ol = s->period_size - s->playback1st_size;
410 }
411 l += il;
412 }
413 if (iu == sk->completed_inurb) {
414 if (l != s->period_size)
415 printk(KERN_DEBUG"%s:%i %i\n", __func__, __LINE__,
416 l/(int)s->cfg.frame_size);
417
418 return;
419 }
420second:
421 iu = sk->completed_inurb;
422 id = iu->iso_frame_desc;
423 p = 0;
424 goto loop;
425
426}
427#else
428static void loop_back(struct usb_stream *s)
429{
430}
431#endif
432
433static void stream_idle(struct usb_stream_kernel *sk,
434 struct urb *inurb, struct urb *outurb)
435{
436 struct usb_stream *s = sk->s;
437 int l, p;
438 int insize = s->idle_insize;
439 int urb_size = 0;
440
441 s->inpacket_split = s->next_inpacket_split;
442 s->inpacket_split_at = s->next_inpacket_split_at;
443 s->next_inpacket_split = -1;
444 s->next_inpacket_split_at = 0;
445
446 for (p = 0; p < inurb->number_of_packets; ++p) {
447 struct usb_iso_packet_descriptor *id = inurb->iso_frame_desc;
448 l = id[p].actual_length;
449 if (unlikely(l == 0 || id[p].status)) {
450 snd_printk(KERN_WARNING "underrun, status=%u\n",
451 id[p].status);
452 goto err_out;
453 }
454 s->inpacket_head++;
455 s->inpacket_head %= s->inpackets;
456 if (s->inpacket_split == -1)
457 s->inpacket_split = s->inpacket_head;
458
459 s->inpacket[s->inpacket_head].offset =
460 id[p].offset + (inurb->transfer_buffer - (void *)s);
461 s->inpacket[s->inpacket_head].length = l;
462 if (insize + l > s->period_size &&
463 s->next_inpacket_split == -1) {
464 s->next_inpacket_split = s->inpacket_head;
465 s->next_inpacket_split_at = s->period_size - insize;
466 }
467 insize += l;
468 urb_size += l;
469 }
470 s->idle_insize += urb_size - s->period_size;
471 if (s->idle_insize < 0) {
472 snd_printk(KERN_WARNING "%i\n",
473 (s->idle_insize)/(int)s->cfg.frame_size);
474 goto err_out;
475 }
476 s->insize_done += urb_size;
477
478 l = s->idle_outsize;
479 s->outpacket[0].offset = (sk->idle_outurb->transfer_buffer -
480 sk->write_page) - l;
481
482 if (usb_stream_prepare_playback(sk, inurb) < 0)
483 goto err_out;
484
485 s->outpacket[0].length = sk->idle_outurb->transfer_buffer_length + l;
486 s->outpacket[1].offset = sk->completed_outurb->transfer_buffer -
487 sk->write_page;
488
489 if (submit_urbs(sk, inurb, outurb) < 0)
490 goto err_out;
491
492 loop_back(s);
493 s->periods_done++;
494 wake_up_all(&sk->sleep);
495 return;
496err_out:
497 s->state = usb_stream_xrun;
498 wake_up_all(&sk->sleep);
499}
500
501static void i_capture_idle(struct urb *urb)
502{
503 struct usb_stream_kernel *sk = urb->context;
504 if (balance_capture(sk, urb))
505 stream_idle(sk, urb, sk->i_urb);
506}
507
508static void i_playback_idle(struct urb *urb)
509{
510 struct usb_stream_kernel *sk = urb->context;
511 if (balance_playback(sk, urb))
512 stream_idle(sk, sk->i_urb, urb);
513}
514
515static void stream_start(struct usb_stream_kernel *sk,
516 struct urb *inurb, struct urb *outurb)
517{
518 struct usb_stream *s = sk->s;
519 if (s->state >= usb_stream_sync1) {
520 int l, p, max_diff, max_diff_0;
521 int urb_size = 0;
522 unsigned frames_per_packet, min_frames = 0;
523 frames_per_packet = (s->period_size - s->idle_insize);
524 frames_per_packet <<= 8;
525 frames_per_packet /=
526 s->cfg.frame_size * inurb->number_of_packets;
527 frames_per_packet++;
528
529 max_diff_0 = s->cfg.frame_size;
530 if (s->cfg.period_frames >= 256)
531 max_diff_0 <<= 1;
532 if (s->cfg.period_frames >= 1024)
533 max_diff_0 <<= 1;
534 max_diff = max_diff_0;
535 for (p = 0; p < inurb->number_of_packets; ++p) {
536 int diff;
537 l = inurb->iso_frame_desc[p].actual_length;
538 urb_size += l;
539
540 min_frames += frames_per_packet;
541 diff = urb_size -
542 (min_frames >> 8) * s->cfg.frame_size;
543 if (diff < max_diff) {
544 snd_printdd(KERN_DEBUG "%i %i %i %i\n",
545 s->insize_done,
546 urb_size / (int)s->cfg.frame_size,
547 inurb->number_of_packets, diff);
548 max_diff = diff;
549 }
550 }
551 s->idle_insize -= max_diff - max_diff_0;
552 s->idle_insize += urb_size - s->period_size;
553 if (s->idle_insize < 0) {
554 snd_printk(KERN_WARNING "%i %i %i\n",
555 s->idle_insize, urb_size, s->period_size);
556 return;
557 } else if (s->idle_insize == 0) {
558 s->next_inpacket_split =
559 (s->inpacket_head + 1) % s->inpackets;
560 s->next_inpacket_split_at = 0;
561 } else {
562 unsigned split = s->inpacket_head;
563 l = s->idle_insize;
564 while (l > s->inpacket[split].length) {
565 l -= s->inpacket[split].length;
566 if (split == 0)
567 split = s->inpackets - 1;
568 else
569 split--;
570 }
571 s->next_inpacket_split = split;
572 s->next_inpacket_split_at =
573 s->inpacket[split].length - l;
574 }
575
576 s->insize_done += urb_size;
577
578 if (usb_stream_prepare_playback(sk, inurb) < 0)
579 return;
580
581 } else
582 playback_prep_freqn(sk, sk->idle_outurb);
583
584 if (submit_urbs(sk, inurb, outurb) < 0)
585 return;
586
587 if (s->state == usb_stream_sync1 && s->insize_done > 360000) {
588
589 s->state = usb_stream_ready;
590 subs_set_complete(sk->inurb, i_capture_idle);
591 subs_set_complete(sk->outurb, i_playback_idle);
592 }
593}
594
595static void i_capture_start(struct urb *urb)
596{
597 struct usb_iso_packet_descriptor *id = urb->iso_frame_desc;
598 struct usb_stream_kernel *sk = urb->context;
599 struct usb_stream *s = sk->s;
600 int p;
601 int empty = 0;
602
603 if (urb->status) {
604 snd_printk(KERN_WARNING "status=%i\n", urb->status);
605 return;
606 }
607
608 for (p = 0; p < urb->number_of_packets; ++p) {
609 int l = id[p].actual_length;
610 if (l < s->cfg.frame_size) {
611 ++empty;
612 if (s->state >= usb_stream_sync0) {
613 snd_printk(KERN_WARNING "%i\n", l);
614 return;
615 }
616 }
617 s->inpacket_head++;
618 s->inpacket_head %= s->inpackets;
619 s->inpacket[s->inpacket_head].offset =
620 id[p].offset + (urb->transfer_buffer - (void *)s);
621 s->inpacket[s->inpacket_head].length = l;
622 }
623#ifdef SHOW_EMPTY
624 if (empty) {
625 printk(KERN_DEBUG"%s:%i: %i", __func__, __LINE__,
626 urb->iso_frame_desc[0].actual_length);
627 for (pack = 1; pack < urb->number_of_packets; ++pack) {
628 int l = urb->iso_frame_desc[pack].actual_length;
629 printk(" %i", l);
630 }
631 printk("\n");
632 }
633#endif
634 if (!empty && s->state < usb_stream_sync1)
635 ++s->state;
636
637 if (balance_capture(sk, urb))
638 stream_start(sk, urb, sk->i_urb);
639}
640
641static void i_playback_start(struct urb *urb)
642{
643 struct usb_stream_kernel *sk = urb->context;
644 if (balance_playback(sk, urb))
645 stream_start(sk, sk->i_urb, urb);
646}
647
648int usb_stream_start(struct usb_stream_kernel *sk)
649{
650 struct usb_stream *s = sk->s;
651 int frame = 0, iters = 0;
652 int u, err;
653 int try = 0;
654
655 if (s->state != usb_stream_stopped)
656 return -EAGAIN;
657
658 subs_set_complete(sk->inurb, i_capture_start);
659 subs_set_complete(sk->outurb, i_playback_start);
660 memset(sk->write_page, 0, s->write_size);
661dotry:
662 s->insize_done = 0;
663 s->idle_insize = 0;
664 s->idle_outsize = 0;
665 s->sync_packet = -1;
666 s->inpacket_head = -1;
667 sk->iso_frame_balance = 0;
668 ++try;
669 for (u = 0; u < 2; u++) {
670 struct urb *inurb = sk->inurb[u];
671 struct urb *outurb = sk->outurb[u];
672 playback_prep_freqn(sk, outurb);
673 inurb->number_of_packets = outurb->number_of_packets;
674 inurb->transfer_buffer_length =
675 inurb->number_of_packets *
676 inurb->iso_frame_desc[0].length;
677
678 if (u == 0) {
679 int now;
680 struct usb_device *dev = inurb->dev;
681 frame = usb_get_current_frame_number(dev);
682 do {
683 now = usb_get_current_frame_number(dev);
684 ++iters;
685 } while (now > -1 && now == frame);
686 }
687 err = usb_submit_urb(inurb, GFP_ATOMIC);
688 if (err < 0) {
689 snd_printk(KERN_ERR"usb_submit_urb(sk->inurb[%i])"
690 " returned %i\n", u, err);
691 return err;
692 }
693 err = usb_submit_urb(outurb, GFP_ATOMIC);
694 if (err < 0) {
695 snd_printk(KERN_ERR"usb_submit_urb(sk->outurb[%i])"
696 " returned %i\n", u, err);
697 return err;
698 }
699
700 if (inurb->start_frame != outurb->start_frame) {
701 snd_printd(KERN_DEBUG
702 "u[%i] start_frames differ in:%u out:%u\n",
703 u, inurb->start_frame, outurb->start_frame);
704 goto check_retry;
705 }
706 }
707 snd_printdd(KERN_DEBUG "%i %i\n", frame, iters);
708 try = 0;
709check_retry:
710 if (try) {
711 usb_stream_stop(sk);
712 if (try < 5) {
713 msleep(1500);
714 snd_printd(KERN_DEBUG "goto dotry;\n");
715 goto dotry;
716 }
717 snd_printk(KERN_WARNING"couldn't start"
718 " all urbs on the same start_frame.\n");
719 return -EFAULT;
720 }
721
722 sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2];
723 sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2];
724 sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1];
725 sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1];
726
727
728 {
729 int wait_ms = 3000;
730 while (s->state != usb_stream_ready && wait_ms > 0) {
731 snd_printdd(KERN_DEBUG "%i\n", s->state);
732 msleep(200);
733 wait_ms -= 200;
734 }
735 }
736
737 return s->state == usb_stream_ready ? 0 : -EFAULT;
738}
739
740
741
742
743void usb_stream_stop(struct usb_stream_kernel *sk)
744{
745 int u;
746 if (!sk->s)
747 return;
748 for (u = 0; u < USB_STREAM_NURBS; ++u) {
749 usb_kill_urb(sk->inurb[u]);
750 usb_kill_urb(sk->outurb[u]);
751 }
752 sk->s->state = usb_stream_stopped;
753 msleep(400);
754}
755
