Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IEEE 1394 for Linux | |
3 | * | |
4 | * kernel ISO transmission/reception | |
5 | * | |
6 | * Copyright (C) 2002 Maas Digital LLC | |
7 | * | |
8 | * This code is licensed under the GPL. See the file COPYING in the root | |
9 | * directory of the kernel sources for details. | |
10 | */ | |
11 | ||
de4394f1 | 12 | #include <linux/pci.h> |
b9e5eb06 | 13 | #include <linux/sched.h> |
27ac792c | 14 | #include <linux/mm.h> |
de4394f1 SR |
15 | #include <linux/slab.h> |
16 | ||
17 | #include "hosts.h" | |
1da177e4 LT |
18 | #include "iso.h" |
19 | ||
afd6546d SR |
20 | /** |
21 | * hpsb_iso_stop - stop DMA | |
22 | */ | |
1da177e4 LT |
23 | void hpsb_iso_stop(struct hpsb_iso *iso) |
24 | { | |
25 | if (!(iso->flags & HPSB_ISO_DRIVER_STARTED)) | |
26 | return; | |
27 | ||
28 | iso->host->driver->isoctl(iso, iso->type == HPSB_ISO_XMIT ? | |
29 | XMIT_STOP : RECV_STOP, 0); | |
30 | iso->flags &= ~HPSB_ISO_DRIVER_STARTED; | |
31 | } | |
32 | ||
afd6546d SR |
33 | /** |
34 | * hpsb_iso_shutdown - deallocate buffer and DMA context | |
35 | */ | |
1da177e4 LT |
36 | void hpsb_iso_shutdown(struct hpsb_iso *iso) |
37 | { | |
38 | if (iso->flags & HPSB_ISO_DRIVER_INIT) { | |
39 | hpsb_iso_stop(iso); | |
40 | iso->host->driver->isoctl(iso, iso->type == HPSB_ISO_XMIT ? | |
41 | XMIT_SHUTDOWN : RECV_SHUTDOWN, 0); | |
42 | iso->flags &= ~HPSB_ISO_DRIVER_INIT; | |
43 | } | |
44 | ||
45 | dma_region_free(&iso->data_buf); | |
46 | kfree(iso); | |
47 | } | |
48 | ||
066ef9c2 JMH |
49 | static struct hpsb_iso *hpsb_iso_common_init(struct hpsb_host *host, |
50 | enum hpsb_iso_type type, | |
1da177e4 LT |
51 | unsigned int data_buf_size, |
52 | unsigned int buf_packets, | |
066ef9c2 | 53 | int channel, int dma_mode, |
1da177e4 | 54 | int irq_interval, |
066ef9c2 JMH |
55 | void (*callback) (struct hpsb_iso |
56 | *)) | |
1da177e4 LT |
57 | { |
58 | struct hpsb_iso *iso; | |
59 | int dma_direction; | |
60 | ||
61 | /* make sure driver supports the ISO API */ | |
62 | if (!host->driver->isoctl) { | |
066ef9c2 JMH |
63 | printk(KERN_INFO |
64 | "ieee1394: host driver '%s' does not support the rawiso API\n", | |
1da177e4 LT |
65 | host->driver->name); |
66 | return NULL; | |
67 | } | |
68 | ||
69 | /* sanitize parameters */ | |
70 | ||
71 | if (buf_packets < 2) | |
72 | buf_packets = 2; | |
73 | ||
066ef9c2 JMH |
74 | if ((dma_mode < HPSB_ISO_DMA_DEFAULT) |
75 | || (dma_mode > HPSB_ISO_DMA_PACKET_PER_BUFFER)) | |
76 | dma_mode = HPSB_ISO_DMA_DEFAULT; | |
1da177e4 | 77 | |
1934b8b6 | 78 | if ((irq_interval < 0) || (irq_interval > buf_packets / 4)) |
066ef9c2 JMH |
79 | irq_interval = buf_packets / 4; |
80 | if (irq_interval == 0) /* really interrupt for each packet */ | |
1da177e4 | 81 | irq_interval = 1; |
1da177e4 LT |
82 | |
83 | if (channel < -1 || channel >= 64) | |
84 | return NULL; | |
85 | ||
86 | /* channel = -1 is OK for multi-channel recv but not for xmit */ | |
87 | if (type == HPSB_ISO_XMIT && channel < 0) | |
88 | return NULL; | |
89 | ||
90 | /* allocate and write the struct hpsb_iso */ | |
91 | ||
066ef9c2 JMH |
92 | iso = |
93 | kmalloc(sizeof(*iso) + | |
94 | buf_packets * sizeof(struct hpsb_iso_packet_info), | |
95 | GFP_KERNEL); | |
1da177e4 LT |
96 | if (!iso) |
97 | return NULL; | |
98 | ||
99 | iso->infos = (struct hpsb_iso_packet_info *)(iso + 1); | |
100 | ||
101 | iso->type = type; | |
102 | iso->host = host; | |
103 | iso->hostdata = NULL; | |
104 | iso->callback = callback; | |
105 | init_waitqueue_head(&iso->waitq); | |
106 | iso->channel = channel; | |
107 | iso->irq_interval = irq_interval; | |
108 | iso->dma_mode = dma_mode; | |
109 | dma_region_init(&iso->data_buf); | |
110 | iso->buf_size = PAGE_ALIGN(data_buf_size); | |
111 | iso->buf_packets = buf_packets; | |
112 | iso->pkt_dma = 0; | |
113 | iso->first_packet = 0; | |
114 | spin_lock_init(&iso->lock); | |
115 | ||
116 | if (iso->type == HPSB_ISO_XMIT) { | |
117 | iso->n_ready_packets = iso->buf_packets; | |
118 | dma_direction = PCI_DMA_TODEVICE; | |
119 | } else { | |
120 | iso->n_ready_packets = 0; | |
121 | dma_direction = PCI_DMA_FROMDEVICE; | |
122 | } | |
123 | ||
124 | atomic_set(&iso->overflows, 0); | |
1934b8b6 | 125 | iso->bytes_discarded = 0; |
1da177e4 LT |
126 | iso->flags = 0; |
127 | iso->prebuffer = 0; | |
128 | ||
129 | /* allocate the packet buffer */ | |
066ef9c2 JMH |
130 | if (dma_region_alloc |
131 | (&iso->data_buf, iso->buf_size, host->pdev, dma_direction)) | |
1da177e4 LT |
132 | goto err; |
133 | ||
134 | return iso; | |
135 | ||
066ef9c2 | 136 | err: |
1da177e4 LT |
137 | hpsb_iso_shutdown(iso); |
138 | return NULL; | |
139 | } | |
140 | ||
afd6546d SR |
141 | /** |
142 | * hpsb_iso_n_ready - returns number of packets ready to send or receive | |
143 | */ | |
066ef9c2 | 144 | int hpsb_iso_n_ready(struct hpsb_iso *iso) |
1da177e4 LT |
145 | { |
146 | unsigned long flags; | |
147 | int val; | |
148 | ||
149 | spin_lock_irqsave(&iso->lock, flags); | |
150 | val = iso->n_ready_packets; | |
151 | spin_unlock_irqrestore(&iso->lock, flags); | |
152 | ||
153 | return val; | |
154 | } | |
155 | ||
afd6546d SR |
156 | /** |
157 | * hpsb_iso_xmit_init - allocate the buffer and DMA context | |
158 | */ | |
066ef9c2 | 159 | struct hpsb_iso *hpsb_iso_xmit_init(struct hpsb_host *host, |
1da177e4 LT |
160 | unsigned int data_buf_size, |
161 | unsigned int buf_packets, | |
162 | int channel, | |
163 | int speed, | |
164 | int irq_interval, | |
066ef9c2 | 165 | void (*callback) (struct hpsb_iso *)) |
1da177e4 LT |
166 | { |
167 | struct hpsb_iso *iso = hpsb_iso_common_init(host, HPSB_ISO_XMIT, | |
168 | data_buf_size, buf_packets, | |
066ef9c2 JMH |
169 | channel, |
170 | HPSB_ISO_DMA_DEFAULT, | |
171 | irq_interval, callback); | |
1da177e4 LT |
172 | if (!iso) |
173 | return NULL; | |
174 | ||
175 | iso->speed = speed; | |
176 | ||
177 | /* tell the driver to start working */ | |
178 | if (host->driver->isoctl(iso, XMIT_INIT, 0)) | |
179 | goto err; | |
180 | ||
181 | iso->flags |= HPSB_ISO_DRIVER_INIT; | |
182 | return iso; | |
183 | ||
066ef9c2 | 184 | err: |
1da177e4 LT |
185 | hpsb_iso_shutdown(iso); |
186 | return NULL; | |
187 | } | |
188 | ||
afd6546d SR |
189 | /** |
190 | * hpsb_iso_recv_init - allocate the buffer and DMA context | |
191 | * | |
192 | * Note, if channel = -1, multi-channel receive is enabled. | |
193 | */ | |
066ef9c2 | 194 | struct hpsb_iso *hpsb_iso_recv_init(struct hpsb_host *host, |
1da177e4 LT |
195 | unsigned int data_buf_size, |
196 | unsigned int buf_packets, | |
197 | int channel, | |
198 | int dma_mode, | |
199 | int irq_interval, | |
066ef9c2 | 200 | void (*callback) (struct hpsb_iso *)) |
1da177e4 LT |
201 | { |
202 | struct hpsb_iso *iso = hpsb_iso_common_init(host, HPSB_ISO_RECV, | |
203 | data_buf_size, buf_packets, | |
066ef9c2 JMH |
204 | channel, dma_mode, |
205 | irq_interval, callback); | |
1da177e4 LT |
206 | if (!iso) |
207 | return NULL; | |
208 | ||
209 | /* tell the driver to start working */ | |
210 | if (host->driver->isoctl(iso, RECV_INIT, 0)) | |
211 | goto err; | |
212 | ||
213 | iso->flags |= HPSB_ISO_DRIVER_INIT; | |
214 | return iso; | |
215 | ||
066ef9c2 | 216 | err: |
1da177e4 LT |
217 | hpsb_iso_shutdown(iso); |
218 | return NULL; | |
219 | } | |
220 | ||
afd6546d SR |
221 | /** |
222 | * hpsb_iso_recv_listen_channel | |
223 | * | |
224 | * multi-channel only | |
225 | */ | |
1da177e4 LT |
226 | int hpsb_iso_recv_listen_channel(struct hpsb_iso *iso, unsigned char channel) |
227 | { | |
228 | if (iso->type != HPSB_ISO_RECV || iso->channel != -1 || channel >= 64) | |
229 | return -EINVAL; | |
230 | return iso->host->driver->isoctl(iso, RECV_LISTEN_CHANNEL, channel); | |
231 | } | |
232 | ||
afd6546d SR |
233 | /** |
234 | * hpsb_iso_recv_unlisten_channel | |
235 | * | |
236 | * multi-channel only | |
237 | */ | |
1da177e4 LT |
238 | int hpsb_iso_recv_unlisten_channel(struct hpsb_iso *iso, unsigned char channel) |
239 | { | |
066ef9c2 JMH |
240 | if (iso->type != HPSB_ISO_RECV || iso->channel != -1 || channel >= 64) |
241 | return -EINVAL; | |
242 | return iso->host->driver->isoctl(iso, RECV_UNLISTEN_CHANNEL, channel); | |
1da177e4 LT |
243 | } |
244 | ||
afd6546d SR |
245 | /** |
246 | * hpsb_iso_recv_set_channel_mask | |
247 | * | |
248 | * multi-channel only | |
249 | */ | |
1da177e4 LT |
250 | int hpsb_iso_recv_set_channel_mask(struct hpsb_iso *iso, u64 mask) |
251 | { | |
252 | if (iso->type != HPSB_ISO_RECV || iso->channel != -1) | |
253 | return -EINVAL; | |
066ef9c2 JMH |
254 | return iso->host->driver->isoctl(iso, RECV_SET_CHANNEL_MASK, |
255 | (unsigned long)&mask); | |
1da177e4 LT |
256 | } |
257 | ||
afd6546d SR |
258 | /** |
259 | * hpsb_iso_recv_flush - check for arrival of new packets | |
260 | * | |
261 | * check for arrival of new packets immediately (even if irq_interval | |
262 | * has not yet been reached) | |
263 | */ | |
1da177e4 LT |
264 | int hpsb_iso_recv_flush(struct hpsb_iso *iso) |
265 | { | |
266 | if (iso->type != HPSB_ISO_RECV) | |
267 | return -EINVAL; | |
268 | return iso->host->driver->isoctl(iso, RECV_FLUSH, 0); | |
269 | } | |
270 | ||
271 | static int do_iso_xmit_start(struct hpsb_iso *iso, int cycle) | |
272 | { | |
273 | int retval = iso->host->driver->isoctl(iso, XMIT_START, cycle); | |
274 | if (retval) | |
275 | return retval; | |
276 | ||
277 | iso->flags |= HPSB_ISO_DRIVER_STARTED; | |
278 | return retval; | |
279 | } | |
280 | ||
afd6546d SR |
281 | /** |
282 | * hpsb_iso_xmit_start - start DMA | |
283 | */ | |
1da177e4 LT |
284 | int hpsb_iso_xmit_start(struct hpsb_iso *iso, int cycle, int prebuffer) |
285 | { | |
286 | if (iso->type != HPSB_ISO_XMIT) | |
287 | return -1; | |
288 | ||
289 | if (iso->flags & HPSB_ISO_DRIVER_STARTED) | |
290 | return 0; | |
291 | ||
292 | if (cycle < -1) | |
293 | cycle = -1; | |
294 | else if (cycle >= 8000) | |
295 | cycle %= 8000; | |
296 | ||
297 | iso->xmit_cycle = cycle; | |
298 | ||
299 | if (prebuffer < 0) | |
1934b8b6 | 300 | prebuffer = iso->buf_packets - 1; |
1da177e4 LT |
301 | else if (prebuffer == 0) |
302 | prebuffer = 1; | |
303 | ||
1934b8b6 BC |
304 | if (prebuffer >= iso->buf_packets) |
305 | prebuffer = iso->buf_packets - 1; | |
1da177e4 LT |
306 | |
307 | iso->prebuffer = prebuffer; | |
308 | ||
309 | /* remember the starting cycle; DMA will commence from xmit_queue_packets() | |
310 | once enough packets have been buffered */ | |
311 | iso->start_cycle = cycle; | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
afd6546d SR |
316 | /** |
317 | * hpsb_iso_recv_start - start DMA | |
318 | */ | |
1da177e4 LT |
319 | int hpsb_iso_recv_start(struct hpsb_iso *iso, int cycle, int tag_mask, int sync) |
320 | { | |
321 | int retval = 0; | |
322 | int isoctl_args[3]; | |
323 | ||
324 | if (iso->type != HPSB_ISO_RECV) | |
325 | return -1; | |
326 | ||
327 | if (iso->flags & HPSB_ISO_DRIVER_STARTED) | |
328 | return 0; | |
329 | ||
330 | if (cycle < -1) | |
331 | cycle = -1; | |
332 | else if (cycle >= 8000) | |
333 | cycle %= 8000; | |
334 | ||
335 | isoctl_args[0] = cycle; | |
336 | ||
337 | if (tag_mask < 0) | |
338 | /* match all tags */ | |
339 | tag_mask = 0xF; | |
340 | isoctl_args[1] = tag_mask; | |
341 | ||
342 | isoctl_args[2] = sync; | |
343 | ||
066ef9c2 JMH |
344 | retval = |
345 | iso->host->driver->isoctl(iso, RECV_START, | |
346 | (unsigned long)&isoctl_args[0]); | |
1da177e4 LT |
347 | if (retval) |
348 | return retval; | |
349 | ||
350 | iso->flags |= HPSB_ISO_DRIVER_STARTED; | |
351 | return retval; | |
352 | } | |
353 | ||
354 | /* check to make sure the user has not supplied bogus values of offset/len | |
afd6546d | 355 | * that would cause the kernel to access memory outside the buffer */ |
1da177e4 LT |
356 | static int hpsb_iso_check_offset_len(struct hpsb_iso *iso, |
357 | unsigned int offset, unsigned short len, | |
066ef9c2 JMH |
358 | unsigned int *out_offset, |
359 | unsigned short *out_len) | |
1da177e4 LT |
360 | { |
361 | if (offset >= iso->buf_size) | |
362 | return -EFAULT; | |
363 | ||
364 | /* make sure the packet does not go beyond the end of the buffer */ | |
365 | if (offset + len > iso->buf_size) | |
366 | return -EFAULT; | |
367 | ||
368 | /* check for wrap-around */ | |
369 | if (offset + len < offset) | |
370 | return -EFAULT; | |
371 | ||
372 | /* now we can trust 'offset' and 'length' */ | |
373 | *out_offset = offset; | |
374 | *out_len = len; | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
afd6546d SR |
379 | /** |
380 | * hpsb_iso_xmit_queue_packet - queue a packet for transmission. | |
381 | * | |
382 | * @offset is relative to the beginning of the DMA buffer, where the packet's | |
383 | * data payload should already have been placed. | |
384 | */ | |
066ef9c2 JMH |
385 | int hpsb_iso_xmit_queue_packet(struct hpsb_iso *iso, u32 offset, u16 len, |
386 | u8 tag, u8 sy) | |
1da177e4 LT |
387 | { |
388 | struct hpsb_iso_packet_info *info; | |
389 | unsigned long flags; | |
390 | int rv; | |
391 | ||
392 | if (iso->type != HPSB_ISO_XMIT) | |
393 | return -EINVAL; | |
394 | ||
395 | /* is there space in the buffer? */ | |
396 | if (iso->n_ready_packets <= 0) { | |
397 | return -EBUSY; | |
398 | } | |
399 | ||
400 | info = &iso->infos[iso->first_packet]; | |
401 | ||
402 | /* check for bogus offset/length */ | |
066ef9c2 JMH |
403 | if (hpsb_iso_check_offset_len |
404 | (iso, offset, len, &info->offset, &info->len)) | |
1da177e4 LT |
405 | return -EFAULT; |
406 | ||
407 | info->tag = tag; | |
408 | info->sy = sy; | |
409 | ||
410 | spin_lock_irqsave(&iso->lock, flags); | |
411 | ||
066ef9c2 | 412 | rv = iso->host->driver->isoctl(iso, XMIT_QUEUE, (unsigned long)info); |
1da177e4 LT |
413 | if (rv) |
414 | goto out; | |
415 | ||
416 | /* increment cursors */ | |
066ef9c2 JMH |
417 | iso->first_packet = (iso->first_packet + 1) % iso->buf_packets; |
418 | iso->xmit_cycle = (iso->xmit_cycle + 1) % 8000; | |
1da177e4 LT |
419 | iso->n_ready_packets--; |
420 | ||
421 | if (iso->prebuffer != 0) { | |
422 | iso->prebuffer--; | |
423 | if (iso->prebuffer <= 0) { | |
424 | iso->prebuffer = 0; | |
425 | rv = do_iso_xmit_start(iso, iso->start_cycle); | |
426 | } | |
427 | } | |
428 | ||
066ef9c2 | 429 | out: |
1da177e4 LT |
430 | spin_unlock_irqrestore(&iso->lock, flags); |
431 | return rv; | |
432 | } | |
433 | ||
afd6546d SR |
434 | /** |
435 | * hpsb_iso_xmit_sync - wait until all queued packets have been transmitted | |
436 | */ | |
1da177e4 LT |
437 | int hpsb_iso_xmit_sync(struct hpsb_iso *iso) |
438 | { | |
439 | if (iso->type != HPSB_ISO_XMIT) | |
440 | return -EINVAL; | |
441 | ||
066ef9c2 JMH |
442 | return wait_event_interruptible(iso->waitq, |
443 | hpsb_iso_n_ready(iso) == | |
444 | iso->buf_packets); | |
1da177e4 LT |
445 | } |
446 | ||
afd6546d SR |
447 | /** |
448 | * hpsb_iso_packet_sent | |
449 | * | |
450 | * Available to low-level drivers. | |
451 | * | |
452 | * Call after a packet has been transmitted to the bus (interrupt context is | |
453 | * OK). @cycle is the _exact_ cycle the packet was sent on. @error should be | |
454 | * non-zero if some sort of error occurred when sending the packet. | |
455 | */ | |
1da177e4 LT |
456 | void hpsb_iso_packet_sent(struct hpsb_iso *iso, int cycle, int error) |
457 | { | |
458 | unsigned long flags; | |
459 | spin_lock_irqsave(&iso->lock, flags); | |
460 | ||
461 | /* predict the cycle of the next packet to be queued */ | |
462 | ||
463 | /* jump ahead by the number of packets that are already buffered */ | |
464 | cycle += iso->buf_packets - iso->n_ready_packets; | |
465 | cycle %= 8000; | |
466 | ||
467 | iso->xmit_cycle = cycle; | |
468 | iso->n_ready_packets++; | |
469 | iso->pkt_dma = (iso->pkt_dma + 1) % iso->buf_packets; | |
470 | ||
471 | if (iso->n_ready_packets == iso->buf_packets || error != 0) { | |
472 | /* the buffer has run empty! */ | |
473 | atomic_inc(&iso->overflows); | |
474 | } | |
475 | ||
476 | spin_unlock_irqrestore(&iso->lock, flags); | |
477 | } | |
478 | ||
afd6546d SR |
479 | /** |
480 | * hpsb_iso_packet_received | |
481 | * | |
482 | * Available to low-level drivers. | |
483 | * | |
484 | * Call after a packet has been received (interrupt context is OK). | |
485 | */ | |
1da177e4 | 486 | void hpsb_iso_packet_received(struct hpsb_iso *iso, u32 offset, u16 len, |
066ef9c2 JMH |
487 | u16 total_len, u16 cycle, u8 channel, u8 tag, |
488 | u8 sy) | |
1da177e4 LT |
489 | { |
490 | unsigned long flags; | |
491 | spin_lock_irqsave(&iso->lock, flags); | |
492 | ||
493 | if (iso->n_ready_packets == iso->buf_packets) { | |
494 | /* overflow! */ | |
495 | atomic_inc(&iso->overflows); | |
1934b8b6 BC |
496 | /* Record size of this discarded packet */ |
497 | iso->bytes_discarded += total_len; | |
1da177e4 LT |
498 | } else { |
499 | struct hpsb_iso_packet_info *info = &iso->infos[iso->pkt_dma]; | |
500 | info->offset = offset; | |
501 | info->len = len; | |
1934b8b6 | 502 | info->total_len = total_len; |
1da177e4 LT |
503 | info->cycle = cycle; |
504 | info->channel = channel; | |
505 | info->tag = tag; | |
506 | info->sy = sy; | |
507 | ||
066ef9c2 | 508 | iso->pkt_dma = (iso->pkt_dma + 1) % iso->buf_packets; |
1da177e4 LT |
509 | iso->n_ready_packets++; |
510 | } | |
511 | ||
512 | spin_unlock_irqrestore(&iso->lock, flags); | |
513 | } | |
514 | ||
afd6546d SR |
515 | /** |
516 | * hpsb_iso_recv_release_packets - release packets, reuse buffer | |
517 | * | |
518 | * @n_packets have been read out of the buffer, re-use the buffer space | |
519 | */ | |
1da177e4 LT |
520 | int hpsb_iso_recv_release_packets(struct hpsb_iso *iso, unsigned int n_packets) |
521 | { | |
522 | unsigned long flags; | |
523 | unsigned int i; | |
524 | int rv = 0; | |
525 | ||
526 | if (iso->type != HPSB_ISO_RECV) | |
527 | return -1; | |
528 | ||
529 | spin_lock_irqsave(&iso->lock, flags); | |
530 | for (i = 0; i < n_packets; i++) { | |
531 | rv = iso->host->driver->isoctl(iso, RECV_RELEASE, | |
066ef9c2 JMH |
532 | (unsigned long)&iso->infos[iso-> |
533 | first_packet]); | |
1da177e4 LT |
534 | if (rv) |
535 | break; | |
536 | ||
066ef9c2 | 537 | iso->first_packet = (iso->first_packet + 1) % iso->buf_packets; |
1da177e4 | 538 | iso->n_ready_packets--; |
1934b8b6 BC |
539 | |
540 | /* release memory from packets discarded when queue was full */ | |
066ef9c2 | 541 | if (iso->n_ready_packets == 0) { /* Release only after all prior packets handled */ |
1934b8b6 BC |
542 | if (iso->bytes_discarded != 0) { |
543 | struct hpsb_iso_packet_info inf; | |
544 | inf.total_len = iso->bytes_discarded; | |
545 | iso->host->driver->isoctl(iso, RECV_RELEASE, | |
066ef9c2 | 546 | (unsigned long)&inf); |
1934b8b6 BC |
547 | iso->bytes_discarded = 0; |
548 | } | |
549 | } | |
1da177e4 LT |
550 | } |
551 | spin_unlock_irqrestore(&iso->lock, flags); | |
552 | return rv; | |
553 | } | |
554 | ||
afd6546d SR |
555 | /** |
556 | * hpsb_iso_wake | |
557 | * | |
558 | * Available to low-level drivers. | |
559 | * | |
560 | * Call to wake waiting processes after buffer space has opened up. | |
561 | */ | |
1da177e4 LT |
562 | void hpsb_iso_wake(struct hpsb_iso *iso) |
563 | { | |
564 | wake_up_interruptible(&iso->waitq); | |
565 | ||
566 | if (iso->callback) | |
567 | iso->callback(iso); | |
568 | } |