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