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Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +01001/*
2 * WUSB Wire Adapter: Radio Control Interface (WUSB[8])
3 * Notification and Event Handling
4 *
5 * Copyright (C) 2005-2006 Intel Corporation
6 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License version
10 * 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
20 * 02110-1301, USA.
21 *
22 *
23 * The RC interface of the Host Wire Adapter (USB dongle) or WHCI PCI
24 * card delivers a stream of notifications and events to the
25 * notification end event endpoint or area. This code takes care of
26 * getting a buffer with that data, breaking it up in separate
27 * notifications and events and then deliver those.
28 *
29 * Events are answers to commands and they carry a context ID that
30 * associates them to the command. Notifications are that,
31 * notifications, they come out of the blue and have a context ID of
32 * zero. Think of the context ID kind of like a handler. The
33 * uwb_rc_neh_* code deals with managing context IDs.
34 *
35 * This is why you require a handle to operate on a UWB host. When you
36 * open a handle a context ID is assigned to you.
37 *
38 * So, as it is done is:
39 *
40 * 1. Add an event handler [uwb_rc_neh_add()] (assigns a ctx id)
41 * 2. Issue command [rc->cmd(rc, ...)]
42 * 3. Arm the timeout timer [uwb_rc_neh_arm()]
43 * 4, Release the reference to the neh [uwb_rc_neh_put()]
44 * 5. Wait for the callback
45 * 6. Command result (RCEB) is passed to the callback
46 *
47 * If (2) fails, you should remove the handle [uwb_rc_neh_rm()]
48 * instead of arming the timer.
49 *
50 * Handles are for using in *serialized* code, single thread.
51 *
52 * When the notification/event comes, the IRQ handler/endpoint
53 * callback passes the data read to uwb_rc_neh_grok() which will break
54 * it up in a discrete series of events, look up who is listening for
55 * them and execute the pertinent callbacks.
56 *
57 * If the reader detects an error while reading the data stream, call
58 * uwb_rc_neh_error().
59 *
60 * CONSTRAINTS/ASSUMPTIONS:
61 *
62 * - Most notifications/events are small (less thank .5k), copying
63 * around is ok.
64 *
65 * - Notifications/events are ALWAYS smaller than PAGE_SIZE
66 *
67 * - Notifications/events always come in a single piece (ie: a buffer
68 * will always contain entire notifications/events).
69 *
70 * - we cannot know in advance how long each event is (because they
71 * lack a length field in their header--smart move by the standards
72 * body, btw). So we need a facility to get the event size given the
73 * header. This is what the EST code does (notif/Event Size
74 * Tables), check nest.c--as well, you can associate the size to
75 * the handle [w/ neh->extra_size()].
76 *
77 * - Most notifications/events are fixed size; only a few are variable
78 * size (NEST takes care of that).
79 *
80 * - Listeners of events expect them, so they usually provide a
81 * buffer, as they know the size. Listeners to notifications don't,
82 * so we allocate their buffers dynamically.
83 */
84#include <linux/kernel.h>
85#include <linux/timer.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090086#include <linux/slab.h>
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +010087#include <linux/err.h>
Paul Gortmaker475c0a62011-07-10 13:18:02 -040088#include <linux/export.h>
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +010089
90#include "uwb-internal.h"
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +010091
92/*
93 * UWB Radio Controller Notification/Event Handle
94 *
95 * Represents an entity waiting for an event coming from the UWB Radio
96 * Controller with a given context id (context) and type (evt_type and
97 * evt). On reception of the notification/event, the callback (cb) is
98 * called with the event.
99 *
100 * If the timer expires before the event is received, the callback is
101 * called with -ETIMEDOUT as the event size.
102 */
103struct uwb_rc_neh {
104 struct kref kref;
105
106 struct uwb_rc *rc;
107 u8 evt_type;
108 __le16 evt;
109 u8 context;
Oliver Neukum9426cd02012-04-16 15:28:28 +0200110 u8 completed;
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100111 uwb_rc_cmd_cb_f cb;
112 void *arg;
113
114 struct timer_list timer;
115 struct list_head list_node;
116};
117
118static void uwb_rc_neh_timer(unsigned long arg);
119
120static void uwb_rc_neh_release(struct kref *kref)
121{
122 struct uwb_rc_neh *neh = container_of(kref, struct uwb_rc_neh, kref);
123
124 kfree(neh);
125}
126
127static void uwb_rc_neh_get(struct uwb_rc_neh *neh)
128{
129 kref_get(&neh->kref);
130}
131
132/**
133 * uwb_rc_neh_put - release reference to a neh
134 * @neh: the neh
135 */
136void uwb_rc_neh_put(struct uwb_rc_neh *neh)
137{
138 kref_put(&neh->kref, uwb_rc_neh_release);
139}
140
141
142/**
143 * Assigns @neh a context id from @rc's pool
144 *
145 * @rc: UWB Radio Controller descriptor; @rc->neh_lock taken
146 * @neh: Notification/Event Handle
147 * @returns 0 if context id was assigned ok; < 0 errno on error (if
148 * all the context IDs are taken).
149 *
150 * (assumes @wa is locked).
151 *
152 * NOTE: WUSB spec reserves context ids 0x00 for notifications and
153 * 0xff is invalid, so they must not be used. Initialization
154 * fills up those two in the bitmap so they are not allocated.
155 *
Dirk Hohndel06fe9fb2009-09-28 21:43:57 -0400156 * We spread the allocation around to reduce the possibility of two
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100157 * consecutive opened @neh's getting the same context ID assigned (to
158 * avoid surprises with late events that timed out long time ago). So
159 * first we search from where @rc->ctx_roll is, if not found, we
160 * search from zero.
161 */
162static
163int __uwb_rc_ctx_get(struct uwb_rc *rc, struct uwb_rc_neh *neh)
164{
165 int result;
166 result = find_next_zero_bit(rc->ctx_bm, UWB_RC_CTX_MAX,
167 rc->ctx_roll++);
168 if (result < UWB_RC_CTX_MAX)
169 goto found;
170 result = find_first_zero_bit(rc->ctx_bm, UWB_RC_CTX_MAX);
171 if (result < UWB_RC_CTX_MAX)
172 goto found;
173 return -ENFILE;
174found:
175 set_bit(result, rc->ctx_bm);
176 neh->context = result;
177 return 0;
178}
179
180
181/** Releases @neh's context ID back to @rc (@rc->neh_lock is locked). */
182static
183void __uwb_rc_ctx_put(struct uwb_rc *rc, struct uwb_rc_neh *neh)
184{
185 struct device *dev = &rc->uwb_dev.dev;
186 if (neh->context == 0)
187 return;
188 if (test_bit(neh->context, rc->ctx_bm) == 0) {
189 dev_err(dev, "context %u not set in bitmap\n",
190 neh->context);
191 WARN_ON(1);
192 }
193 clear_bit(neh->context, rc->ctx_bm);
194 neh->context = 0;
195}
196
197/**
198 * uwb_rc_neh_add - add a neh for a radio controller command
199 * @rc: the radio controller
200 * @cmd: the radio controller command
201 * @expected_type: the type of the expected response event
202 * @expected_event: the expected event ID
203 * @cb: callback for when the event is received
204 * @arg: argument for the callback
205 *
206 * Creates a neh and adds it to the list of those waiting for an
207 * event. A context ID will be assigned to the command.
208 */
209struct uwb_rc_neh *uwb_rc_neh_add(struct uwb_rc *rc, struct uwb_rccb *cmd,
210 u8 expected_type, u16 expected_event,
211 uwb_rc_cmd_cb_f cb, void *arg)
212{
213 int result;
214 unsigned long flags;
215 struct device *dev = &rc->uwb_dev.dev;
216 struct uwb_rc_neh *neh;
217
218 neh = kzalloc(sizeof(*neh), GFP_KERNEL);
219 if (neh == NULL) {
220 result = -ENOMEM;
221 goto error_kzalloc;
222 }
223
224 kref_init(&neh->kref);
225 INIT_LIST_HEAD(&neh->list_node);
226 init_timer(&neh->timer);
227 neh->timer.function = uwb_rc_neh_timer;
228 neh->timer.data = (unsigned long)neh;
229
230 neh->rc = rc;
231 neh->evt_type = expected_type;
232 neh->evt = cpu_to_le16(expected_event);
233 neh->cb = cb;
234 neh->arg = arg;
235
236 spin_lock_irqsave(&rc->neh_lock, flags);
237 result = __uwb_rc_ctx_get(rc, neh);
238 if (result >= 0) {
239 cmd->bCommandContext = neh->context;
240 list_add_tail(&neh->list_node, &rc->neh_list);
241 uwb_rc_neh_get(neh);
242 }
243 spin_unlock_irqrestore(&rc->neh_lock, flags);
244 if (result < 0)
245 goto error_ctx_get;
246
247 return neh;
248
249error_ctx_get:
250 kfree(neh);
251error_kzalloc:
252 dev_err(dev, "cannot open handle to radio controller: %d\n", result);
253 return ERR_PTR(result);
254}
255
256static void __uwb_rc_neh_rm(struct uwb_rc *rc, struct uwb_rc_neh *neh)
257{
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100258 __uwb_rc_ctx_put(rc, neh);
259 list_del(&neh->list_node);
260}
261
262/**
263 * uwb_rc_neh_rm - remove a neh.
264 * @rc: the radio controller
265 * @neh: the neh to remove
266 *
267 * Remove an active neh immediately instead of waiting for the event
268 * (or a time out).
269 */
270void uwb_rc_neh_rm(struct uwb_rc *rc, struct uwb_rc_neh *neh)
271{
272 unsigned long flags;
273
274 spin_lock_irqsave(&rc->neh_lock, flags);
275 __uwb_rc_neh_rm(rc, neh);
276 spin_unlock_irqrestore(&rc->neh_lock, flags);
277
David Vrabel58be81ed2008-11-07 18:19:19 +0000278 del_timer_sync(&neh->timer);
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100279 uwb_rc_neh_put(neh);
280}
281
282/**
283 * uwb_rc_neh_arm - arm an event handler timeout timer
284 *
285 * @rc: UWB Radio Controller
286 * @neh: Notification/event handler for @rc
287 *
288 * The timer is only armed if the neh is active.
289 */
290void uwb_rc_neh_arm(struct uwb_rc *rc, struct uwb_rc_neh *neh)
291{
292 unsigned long flags;
293
294 spin_lock_irqsave(&rc->neh_lock, flags);
295 if (neh->context)
296 mod_timer(&neh->timer,
297 jiffies + msecs_to_jiffies(UWB_RC_CMD_TIMEOUT_MS));
298 spin_unlock_irqrestore(&rc->neh_lock, flags);
299}
300
301static void uwb_rc_neh_cb(struct uwb_rc_neh *neh, struct uwb_rceb *rceb, size_t size)
302{
303 (*neh->cb)(neh->rc, neh->arg, rceb, size);
304 uwb_rc_neh_put(neh);
305}
306
307static bool uwb_rc_neh_match(struct uwb_rc_neh *neh, const struct uwb_rceb *rceb)
308{
309 return neh->evt_type == rceb->bEventType
310 && neh->evt == rceb->wEvent
311 && neh->context == rceb->bEventContext;
312}
313
314/**
315 * Find the handle waiting for a RC Radio Control Event
316 *
317 * @rc: UWB Radio Controller
318 * @rceb: Pointer to the RCEB buffer
319 * @event_size: Pointer to the size of the RCEB buffer. Might be
320 * adjusted to take into account the @neh->extra_size
321 * settings.
322 *
323 * If the listener has no buffer (NULL buffer), one is allocated for
324 * the right size (the amount of data received). @neh->ptr will point
325 * to the event payload, which always starts with a 'struct
326 * uwb_rceb'. kfree() it when done.
327 */
328static
329struct uwb_rc_neh *uwb_rc_neh_lookup(struct uwb_rc *rc,
330 const struct uwb_rceb *rceb)
331{
332 struct uwb_rc_neh *neh = NULL, *h;
333 unsigned long flags;
334
335 spin_lock_irqsave(&rc->neh_lock, flags);
336
337 list_for_each_entry(h, &rc->neh_list, list_node) {
338 if (uwb_rc_neh_match(h, rceb)) {
339 neh = h;
340 break;
341 }
342 }
343
344 if (neh)
345 __uwb_rc_neh_rm(rc, neh);
346
347 spin_unlock_irqrestore(&rc->neh_lock, flags);
348
349 return neh;
350}
351
352
David Vrabel02f11ee2008-12-12 13:28:48 +0000353/*
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100354 * Process notifications coming from the radio control interface
355 *
356 * @rc: UWB Radio Control Interface descriptor
357 * @neh: Notification/Event Handler @neh->ptr points to
358 * @uwb_evt->buffer.
359 *
360 * This function is called by the event/notif handling subsystem when
361 * notifications arrive (hwarc_probe() arms a notification/event handle
362 * that calls back this function for every received notification; this
363 * function then will rearm itself).
364 *
365 * Notification data buffers are dynamically allocated by the NEH
366 * handling code in neh.c [uwb_rc_neh_lookup()]. What is actually
367 * allocated is space to contain the notification data.
368 *
369 * Buffers are prefixed with a Radio Control Event Block (RCEB) as
370 * defined by the WUSB Wired-Adapter Radio Control interface. We
371 * just use it for the notification code.
372 *
373 * On each case statement we just transcode endianess of the different
374 * fields. We declare a pointer to a RCI definition of an event, and
375 * then to a UWB definition of the same event (which are the same,
376 * remember). Event if we use different pointers
377 */
378static
379void uwb_rc_notif(struct uwb_rc *rc, struct uwb_rceb *rceb, ssize_t size)
380{
381 struct device *dev = &rc->uwb_dev.dev;
382 struct uwb_event *uwb_evt;
383
384 if (size == -ESHUTDOWN)
385 return;
386 if (size < 0) {
387 dev_err(dev, "ignoring event with error code %zu\n",
388 size);
389 return;
390 }
391
392 uwb_evt = kzalloc(sizeof(*uwb_evt), GFP_ATOMIC);
393 if (unlikely(uwb_evt == NULL)) {
394 dev_err(dev, "no memory to queue event 0x%02x/%04x/%02x\n",
395 rceb->bEventType, le16_to_cpu(rceb->wEvent),
396 rceb->bEventContext);
397 return;
398 }
399 uwb_evt->rc = __uwb_rc_get(rc); /* will be put by uwbd's uwbd_event_handle() */
400 uwb_evt->ts_jiffies = jiffies;
401 uwb_evt->type = UWB_EVT_TYPE_NOTIF;
402 uwb_evt->notif.size = size;
403 uwb_evt->notif.rceb = rceb;
404
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100405 uwbd_event_queue(uwb_evt);
406}
407
408static void uwb_rc_neh_grok_event(struct uwb_rc *rc, struct uwb_rceb *rceb, size_t size)
409{
410 struct device *dev = &rc->uwb_dev.dev;
411 struct uwb_rc_neh *neh;
412 struct uwb_rceb *notif;
Oliver Neukum9426cd02012-04-16 15:28:28 +0200413 unsigned long flags;
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100414
415 if (rceb->bEventContext == 0) {
416 notif = kmalloc(size, GFP_ATOMIC);
417 if (notif) {
418 memcpy(notif, rceb, size);
419 uwb_rc_notif(rc, notif, size);
420 } else
421 dev_err(dev, "event 0x%02x/%04x/%02x (%zu bytes): no memory\n",
422 rceb->bEventType, le16_to_cpu(rceb->wEvent),
423 rceb->bEventContext, size);
424 } else {
425 neh = uwb_rc_neh_lookup(rc, rceb);
David Vrabel58be81ed2008-11-07 18:19:19 +0000426 if (neh) {
Oliver Neukum9426cd02012-04-16 15:28:28 +0200427 spin_lock_irqsave(&rc->neh_lock, flags);
428 /* to guard against a timeout */
429 neh->completed = 1;
430 del_timer(&neh->timer);
431 spin_unlock_irqrestore(&rc->neh_lock, flags);
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100432 uwb_rc_neh_cb(neh, rceb, size);
David Vrabel58be81ed2008-11-07 18:19:19 +0000433 } else
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100434 dev_warn(dev, "event 0x%02x/%04x/%02x (%zu bytes): nobody cared\n",
435 rceb->bEventType, le16_to_cpu(rceb->wEvent),
436 rceb->bEventContext, size);
437 }
438}
439
440/**
441 * Given a buffer with one or more UWB RC events/notifications, break
442 * them up and dispatch them.
443 *
444 * @rc: UWB Radio Controller
445 * @buf: Buffer with the stream of notifications/events
446 * @buf_size: Amount of data in the buffer
447 *
448 * Note each notification/event starts always with a 'struct
449 * uwb_rceb', so the minimum size if 4 bytes.
450 *
451 * The device may pass us events formatted differently than expected.
452 * These are first filtered, potentially creating a new event in a new
453 * memory location. If a new event is created by the filter it is also
454 * freed here.
455 *
456 * For each notif/event, tries to guess the size looking at the EST
457 * tables, then looks for a neh that is waiting for that event and if
458 * found, copies the payload to the neh's buffer and calls it back. If
459 * not, the data is ignored.
460 *
461 * Note that if we can't find a size description in the EST tables, we
462 * still might find a size in the 'neh' handle in uwb_rc_neh_lookup().
463 *
464 * Assumptions:
465 *
466 * @rc->neh_lock is NOT taken
467 *
468 * We keep track of various sizes here:
469 * size: contains the size of the buffer that is processed for the
470 * incoming event. this buffer may contain events that are not
471 * formatted as WHCI.
472 * real_size: the actual space taken by this event in the buffer.
473 * We need to keep track of the real size of an event to be able to
474 * advance the buffer correctly.
475 * event_size: the size of the event as expected by the core layer
476 * [OR] the size of the event after filtering. if the filtering
477 * created a new event in a new memory location then this is
478 * effectively the size of a new event buffer
479 */
480void uwb_rc_neh_grok(struct uwb_rc *rc, void *buf, size_t buf_size)
481{
482 struct device *dev = &rc->uwb_dev.dev;
483 void *itr;
484 struct uwb_rceb *rceb;
485 size_t size, real_size, event_size;
486 int needtofree;
487
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100488 itr = buf;
489 size = buf_size;
490 while (size > 0) {
491 if (size < sizeof(*rceb)) {
492 dev_err(dev, "not enough data in event buffer to "
493 "process incoming events (%zu left, minimum is "
494 "%zu)\n", size, sizeof(*rceb));
495 break;
496 }
497
498 rceb = itr;
499 if (rc->filter_event) {
500 needtofree = rc->filter_event(rc, &rceb, size,
501 &real_size, &event_size);
502 if (needtofree < 0 && needtofree != -ENOANO) {
503 dev_err(dev, "BUG: Unable to filter event "
504 "(0x%02x/%04x/%02x) from "
505 "device. \n", rceb->bEventType,
506 le16_to_cpu(rceb->wEvent),
507 rceb->bEventContext);
508 break;
509 }
510 } else
511 needtofree = -ENOANO;
512 /* do real processing if there was no filtering or the
513 * filtering didn't act */
514 if (needtofree == -ENOANO) {
515 ssize_t ret = uwb_est_find_size(rc, rceb, size);
516 if (ret < 0)
517 break;
518 if (ret > size) {
519 dev_err(dev, "BUG: hw sent incomplete event "
520 "0x%02x/%04x/%02x (%zd bytes), only got "
521 "%zu bytes. We don't handle that.\n",
522 rceb->bEventType, le16_to_cpu(rceb->wEvent),
523 rceb->bEventContext, ret, size);
524 break;
525 }
526 real_size = event_size = ret;
527 }
528 uwb_rc_neh_grok_event(rc, rceb, event_size);
529
530 if (needtofree == 1)
531 kfree(rceb);
532
533 itr += real_size;
534 size -= real_size;
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100535 }
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100536}
537EXPORT_SYMBOL_GPL(uwb_rc_neh_grok);
538
539
540/**
541 * The entity that reads from the device notification/event channel has
542 * detected an error.
543 *
544 * @rc: UWB Radio Controller
545 * @error: Errno error code
546 *
547 */
548void uwb_rc_neh_error(struct uwb_rc *rc, int error)
549{
David Vrabel58be81ed2008-11-07 18:19:19 +0000550 struct uwb_rc_neh *neh;
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100551 unsigned long flags;
552
David Vrabel58be81ed2008-11-07 18:19:19 +0000553 for (;;) {
554 spin_lock_irqsave(&rc->neh_lock, flags);
555 if (list_empty(&rc->neh_list)) {
556 spin_unlock_irqrestore(&rc->neh_lock, flags);
557 break;
558 }
559 neh = list_first_entry(&rc->neh_list, struct uwb_rc_neh, list_node);
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100560 __uwb_rc_neh_rm(rc, neh);
David Vrabel58be81ed2008-11-07 18:19:19 +0000561 spin_unlock_irqrestore(&rc->neh_lock, flags);
562
563 del_timer_sync(&neh->timer);
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100564 uwb_rc_neh_cb(neh, NULL, error);
565 }
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100566}
567EXPORT_SYMBOL_GPL(uwb_rc_neh_error);
568
569
570static void uwb_rc_neh_timer(unsigned long arg)
571{
572 struct uwb_rc_neh *neh = (struct uwb_rc_neh *)arg;
573 struct uwb_rc *rc = neh->rc;
574 unsigned long flags;
575
576 spin_lock_irqsave(&rc->neh_lock, flags);
Oliver Neukum9426cd02012-04-16 15:28:28 +0200577 if (neh->completed) {
578 spin_unlock_irqrestore(&rc->neh_lock, flags);
579 return;
580 }
David Vrabel58be81ed2008-11-07 18:19:19 +0000581 if (neh->context)
582 __uwb_rc_neh_rm(rc, neh);
583 else
584 neh = NULL;
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100585 spin_unlock_irqrestore(&rc->neh_lock, flags);
586
David Vrabel58be81ed2008-11-07 18:19:19 +0000587 if (neh)
588 uwb_rc_neh_cb(neh, NULL, -ETIMEDOUT);
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100589}
590
591/** Initializes the @rc's neh subsystem
592 */
593void uwb_rc_neh_create(struct uwb_rc *rc)
594{
595 spin_lock_init(&rc->neh_lock);
596 INIT_LIST_HEAD(&rc->neh_list);
597 set_bit(0, rc->ctx_bm); /* 0 is reserved (see [WUSB] table 8-65) */
598 set_bit(0xff, rc->ctx_bm); /* and 0xff is invalid */
599 rc->ctx_roll = 1;
600}
601
602
603/** Release's the @rc's neh subsystem */
604void uwb_rc_neh_destroy(struct uwb_rc *rc)
605{
606 unsigned long flags;
David Vrabel58be81ed2008-11-07 18:19:19 +0000607 struct uwb_rc_neh *neh;
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100608
David Vrabel58be81ed2008-11-07 18:19:19 +0000609 for (;;) {
610 spin_lock_irqsave(&rc->neh_lock, flags);
611 if (list_empty(&rc->neh_list)) {
612 spin_unlock_irqrestore(&rc->neh_lock, flags);
613 break;
614 }
615 neh = list_first_entry(&rc->neh_list, struct uwb_rc_neh, list_node);
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100616 __uwb_rc_neh_rm(rc, neh);
David Vrabel58be81ed2008-11-07 18:19:19 +0000617 spin_unlock_irqrestore(&rc->neh_lock, flags);
618
619 del_timer_sync(&neh->timer);
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100620 uwb_rc_neh_put(neh);
621 }
Inaky Perez-Gonzalez0612edf2008-09-17 16:34:07 +0100622}