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accel/ivpu: Move recovery work to system_unbound_wq
[drm/drm-misc.git] / drivers / net / wireless / ath / ath9k / htc_drv_txrx.c
blobce9c04e418b8d7d8cfc23e9e5d40968022d73daa
1 /*
2 * Copyright (c) 2010-2011 Atheros Communications Inc.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 #include "htc.h"
18
19 /******/
20 /* TX */
21 /******/
22
23 static const int subtype_txq_to_hwq[] = {
24 [IEEE80211_AC_BE] = ATH_TXQ_AC_BE,
25 [IEEE80211_AC_BK] = ATH_TXQ_AC_BK,
26 [IEEE80211_AC_VI] = ATH_TXQ_AC_VI,
27 [IEEE80211_AC_VO] = ATH_TXQ_AC_VO,
28 };
29
30 #define ATH9K_HTC_INIT_TXQ(subtype) do { \
31 qi.tqi_subtype = subtype_txq_to_hwq[subtype]; \
32 qi.tqi_aifs = ATH9K_TXQ_USEDEFAULT; \
33 qi.tqi_cwmin = ATH9K_TXQ_USEDEFAULT; \
34 qi.tqi_cwmax = ATH9K_TXQ_USEDEFAULT; \
35 qi.tqi_physCompBuf = 0; \
36 qi.tqi_qflags = TXQ_FLAG_TXEOLINT_ENABLE | \
37 TXQ_FLAG_TXDESCINT_ENABLE; \
38 } while (0)
39
40 int get_hw_qnum(u16 queue, int *hwq_map)
41 {
42 switch (queue) {
43 case 0:
44 return hwq_map[IEEE80211_AC_VO];
45 case 1:
46 return hwq_map[IEEE80211_AC_VI];
47 case 2:
48 return hwq_map[IEEE80211_AC_BE];
49 case 3:
50 return hwq_map[IEEE80211_AC_BK];
51 default:
52 return hwq_map[IEEE80211_AC_BE];
53 }
54 }
55
56 void ath9k_htc_check_stop_queues(struct ath9k_htc_priv *priv)
57 {
58 spin_lock_bh(&priv->tx.tx_lock);
59 priv->tx.queued_cnt++;
60 if ((priv->tx.queued_cnt >= ATH9K_HTC_TX_THRESHOLD) &&
61 !(priv->tx.flags & ATH9K_HTC_OP_TX_QUEUES_STOP)) {
62 priv->tx.flags |= ATH9K_HTC_OP_TX_QUEUES_STOP;
63 ieee80211_stop_queues(priv->hw);
64 }
65 spin_unlock_bh(&priv->tx.tx_lock);
66 }
67
68 void ath9k_htc_check_wake_queues(struct ath9k_htc_priv *priv)
69 {
70 spin_lock_bh(&priv->tx.tx_lock);
71 if ((priv->tx.queued_cnt < ATH9K_HTC_TX_THRESHOLD) &&
72 (priv->tx.flags & ATH9K_HTC_OP_TX_QUEUES_STOP)) {
73 priv->tx.flags &= ~ATH9K_HTC_OP_TX_QUEUES_STOP;
74 ieee80211_wake_queues(priv->hw);
75 }
76 spin_unlock_bh(&priv->tx.tx_lock);
77 }
78
79 int ath9k_htc_tx_get_slot(struct ath9k_htc_priv *priv)
80 {
81 int slot;
82
83 spin_lock_bh(&priv->tx.tx_lock);
84 slot = find_first_zero_bit(priv->tx.tx_slot, MAX_TX_BUF_NUM);
85 if (slot >= MAX_TX_BUF_NUM) {
86 spin_unlock_bh(&priv->tx.tx_lock);
87 return -ENOBUFS;
88 }
89 __set_bit(slot, priv->tx.tx_slot);
90 spin_unlock_bh(&priv->tx.tx_lock);
91
92 return slot;
93 }
94
95 void ath9k_htc_tx_clear_slot(struct ath9k_htc_priv *priv, int slot)
96 {
97 spin_lock_bh(&priv->tx.tx_lock);
98 __clear_bit(slot, priv->tx.tx_slot);
99 spin_unlock_bh(&priv->tx.tx_lock);
100 }
101
102 static inline enum htc_endpoint_id get_htc_epid(struct ath9k_htc_priv *priv,
103 u16 qnum)
104 {
105 enum htc_endpoint_id epid;
106
107 switch (qnum) {
108 case 0:
109 TX_QSTAT_INC(priv, IEEE80211_AC_VO);
110 epid = priv->data_vo_ep;
111 break;
112 case 1:
113 TX_QSTAT_INC(priv, IEEE80211_AC_VI);
114 epid = priv->data_vi_ep;
115 break;
116 case 2:
117 TX_QSTAT_INC(priv, IEEE80211_AC_BE);
118 epid = priv->data_be_ep;
119 break;
120 case 3:
121 default:
122 TX_QSTAT_INC(priv, IEEE80211_AC_BK);
123 epid = priv->data_bk_ep;
124 break;
125 }
126
127 return epid;
128 }
129
130 static inline struct sk_buff_head*
131 get_htc_epid_queue(struct ath9k_htc_priv *priv, u8 epid)
132 {
133 struct ath_common *common = ath9k_hw_common(priv->ah);
134 struct sk_buff_head *epid_queue = NULL;
135
136 if (epid == priv->mgmt_ep)
137 epid_queue = &priv->tx.mgmt_ep_queue;
138 else if (epid == priv->cab_ep)
139 epid_queue = &priv->tx.cab_ep_queue;
140 else if (epid == priv->data_be_ep)
141 epid_queue = &priv->tx.data_be_queue;
142 else if (epid == priv->data_bk_ep)
143 epid_queue = &priv->tx.data_bk_queue;
144 else if (epid == priv->data_vi_ep)
145 epid_queue = &priv->tx.data_vi_queue;
146 else if (epid == priv->data_vo_ep)
147 epid_queue = &priv->tx.data_vo_queue;
148 else
149 ath_err(common, "Invalid EPID: %d\n", epid);
150
151 return epid_queue;
152 }
153
154 /*
155 * Removes the driver header and returns the TX slot number
156 */
157 static inline int strip_drv_header(struct ath9k_htc_priv *priv,
158 struct sk_buff *skb)
159 {
160 struct ath_common *common = ath9k_hw_common(priv->ah);
161 struct ath9k_htc_tx_ctl *tx_ctl;
162 int slot;
163
164 tx_ctl = HTC_SKB_CB(skb);
165
166 if (tx_ctl->epid == priv->mgmt_ep) {
167 struct tx_mgmt_hdr *tx_mhdr =
168 (struct tx_mgmt_hdr *)skb->data;
169 slot = tx_mhdr->cookie;
170 skb_pull(skb, sizeof(struct tx_mgmt_hdr));
171 } else if ((tx_ctl->epid == priv->data_bk_ep) ||
172 (tx_ctl->epid == priv->data_be_ep) ||
173 (tx_ctl->epid == priv->data_vi_ep) ||
174 (tx_ctl->epid == priv->data_vo_ep) ||
175 (tx_ctl->epid == priv->cab_ep)) {
176 struct tx_frame_hdr *tx_fhdr =
177 (struct tx_frame_hdr *)skb->data;
178 slot = tx_fhdr->cookie;
179 skb_pull(skb, sizeof(struct tx_frame_hdr));
180 } else {
181 ath_err(common, "Unsupported EPID: %d\n", tx_ctl->epid);
182 slot = -EINVAL;
183 }
184
185 return slot;
186 }
187
188 int ath_htc_txq_update(struct ath9k_htc_priv *priv, int qnum,
189 struct ath9k_tx_queue_info *qinfo)
190 {
191 struct ath_hw *ah = priv->ah;
192 int error = 0;
193 struct ath9k_tx_queue_info qi;
194
195 ath9k_hw_get_txq_props(ah, qnum, &qi);
196
197 qi.tqi_aifs = qinfo->tqi_aifs;
198 qi.tqi_cwmin = qinfo->tqi_cwmin / 2; /* XXX */
199 qi.tqi_cwmax = qinfo->tqi_cwmax;
200 qi.tqi_burstTime = qinfo->tqi_burstTime;
201 qi.tqi_readyTime = qinfo->tqi_readyTime;
202
203 if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) {
204 ath_err(ath9k_hw_common(ah),
205 "Unable to update hardware queue %u!\n", qnum);
206 error = -EIO;
207 } else {
208 ath9k_hw_resettxqueue(ah, qnum);
209 }
210
211 return error;
212 }
213
214 static void ath9k_htc_tx_mgmt(struct ath9k_htc_priv *priv,
215 struct ath9k_htc_vif *avp,
216 struct sk_buff *skb,
217 u8 sta_idx, u8 vif_idx, u8 slot)
218 {
219 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
220 struct ieee80211_mgmt *mgmt;
221 struct ieee80211_hdr *hdr;
222 struct tx_mgmt_hdr mgmt_hdr;
223 struct ath9k_htc_tx_ctl *tx_ctl;
224 u8 *tx_fhdr;
225
226 tx_ctl = HTC_SKB_CB(skb);
227 hdr = (struct ieee80211_hdr *) skb->data;
228
229 memset(tx_ctl, 0, sizeof(*tx_ctl));
230 memset(&mgmt_hdr, 0, sizeof(struct tx_mgmt_hdr));
231
232 /*
233 * Set the TSF adjust value for probe response
234 * frame also.
235 */
236 if (avp && unlikely(ieee80211_is_probe_resp(hdr->frame_control))) {
237 mgmt = (struct ieee80211_mgmt *)skb->data;
238 mgmt->u.probe_resp.timestamp = avp->tsfadjust;
239 }
240
241 tx_ctl->type = ATH9K_HTC_MGMT;
242
243 mgmt_hdr.node_idx = sta_idx;
244 mgmt_hdr.vif_idx = vif_idx;
245 mgmt_hdr.tidno = 0;
246 mgmt_hdr.flags = 0;
247 mgmt_hdr.cookie = slot;
248
249 mgmt_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
250 if (mgmt_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
251 mgmt_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
252 else
253 mgmt_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
254
255 tx_fhdr = skb_push(skb, sizeof(mgmt_hdr));
256 memcpy(tx_fhdr, (u8 *) &mgmt_hdr, sizeof(mgmt_hdr));
257 tx_ctl->epid = priv->mgmt_ep;
258 }
259
260 static void ath9k_htc_tx_data(struct ath9k_htc_priv *priv,
261 struct ieee80211_vif *vif,
262 struct sk_buff *skb,
263 u8 sta_idx, u8 vif_idx, u8 slot,
264 bool is_cab)
265 {
266 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
267 struct ieee80211_hdr *hdr;
268 struct ath9k_htc_tx_ctl *tx_ctl;
269 struct tx_frame_hdr tx_hdr;
270 u32 flags = 0;
271 u8 *qc, *tx_fhdr;
272 u16 qnum;
273
274 tx_ctl = HTC_SKB_CB(skb);
275 hdr = (struct ieee80211_hdr *) skb->data;
276
277 memset(tx_ctl, 0, sizeof(*tx_ctl));
278 memset(&tx_hdr, 0, sizeof(struct tx_frame_hdr));
279
280 tx_hdr.node_idx = sta_idx;
281 tx_hdr.vif_idx = vif_idx;
282 tx_hdr.cookie = slot;
283
284 /*
285 * This is a bit redundant but it helps to get
286 * the per-packet index quickly when draining the
287 * TX queue in the HIF layer. Otherwise we would
288 * have to parse the packet contents ...
289 */
290 tx_ctl->sta_idx = sta_idx;
291
292 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
293 tx_ctl->type = ATH9K_HTC_AMPDU;
294 tx_hdr.data_type = ATH9K_HTC_AMPDU;
295 } else {
296 tx_ctl->type = ATH9K_HTC_NORMAL;
297 tx_hdr.data_type = ATH9K_HTC_NORMAL;
298 }
299
300 /* Transmit all frames that should not be reordered relative
301 * to each other using the same priority. For other QoS data
302 * frames extract the priority from the header.
303 */
304 if (!(tx_info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER) &&
305 ieee80211_is_data_qos(hdr->frame_control)) {
306 qc = ieee80211_get_qos_ctl(hdr);
307 tx_hdr.tidno = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
308 }
309
310 /* Check for RTS protection */
311 if (priv->hw->wiphy->rts_threshold != (u32) -1)
312 if (skb->len > priv->hw->wiphy->rts_threshold)
313 flags |= ATH9K_HTC_TX_RTSCTS;
314
315 /* CTS-to-self */
316 if (!(flags & ATH9K_HTC_TX_RTSCTS) &&
317 (vif && vif->bss_conf.use_cts_prot))
318 flags |= ATH9K_HTC_TX_CTSONLY;
319
320 tx_hdr.flags = cpu_to_be32(flags);
321 tx_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
322 if (tx_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
323 tx_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
324 else
325 tx_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
326
327 tx_fhdr = skb_push(skb, sizeof(tx_hdr));
328 memcpy(tx_fhdr, (u8 *) &tx_hdr, sizeof(tx_hdr));
329
330 if (is_cab) {
331 CAB_STAT_INC(priv);
332 tx_ctl->epid = priv->cab_ep;
333 return;
334 }
335
336 qnum = skb_get_queue_mapping(skb);
337 tx_ctl->epid = get_htc_epid(priv, qnum);
338 }
339
340 int ath9k_htc_tx_start(struct ath9k_htc_priv *priv,
341 struct ieee80211_sta *sta,
342 struct sk_buff *skb,
343 u8 slot, bool is_cab)
344 {
345 struct ieee80211_hdr *hdr;
346 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
347 struct ieee80211_vif *vif = tx_info->control.vif;
348 struct ath9k_htc_sta *ista;
349 struct ath9k_htc_vif *avp = NULL;
350 u8 sta_idx, vif_idx;
351
352 hdr = (struct ieee80211_hdr *) skb->data;
353
354 /*
355 * Find out on which interface this packet has to be
356 * sent out.
357 */
358 if (vif) {
359 avp = (struct ath9k_htc_vif *) vif->drv_priv;
360 vif_idx = avp->index;
361 } else {
362 if (!priv->ah->is_monitoring) {
363 ath_dbg(ath9k_hw_common(priv->ah), XMIT,
364 "VIF is null, but no monitor interface !\n");
365 return -EINVAL;
366 }
367
368 vif_idx = priv->mon_vif_idx;
369 }
370
371 /*
372 * Find out which station this packet is destined for.
373 */
374 if (sta) {
375 ista = (struct ath9k_htc_sta *) sta->drv_priv;
376 sta_idx = ista->index;
377 } else {
378 sta_idx = priv->vif_sta_pos[vif_idx];
379 }
380
381 if (ieee80211_is_data(hdr->frame_control))
382 ath9k_htc_tx_data(priv, vif, skb,
383 sta_idx, vif_idx, slot, is_cab);
384 else
385 ath9k_htc_tx_mgmt(priv, avp, skb,
386 sta_idx, vif_idx, slot);
387
388
389 return htc_send(priv->htc, skb);
390 }
391
392 static inline bool __ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
393 struct ath9k_htc_sta *ista, u8 tid)
394 {
395 bool ret = false;
396
397 spin_lock_bh(&priv->tx.tx_lock);
398 if ((tid < ATH9K_HTC_MAX_TID) && (ista->tid_state[tid] == AGGR_STOP))
399 ret = true;
400 spin_unlock_bh(&priv->tx.tx_lock);
401
402 return ret;
403 }
404
405 static void ath9k_htc_check_tx_aggr(struct ath9k_htc_priv *priv,
406 struct ieee80211_vif *vif,
407 struct sk_buff *skb)
408 {
409 struct ieee80211_sta *sta;
410 struct ieee80211_hdr *hdr;
411 __le16 fc;
412
413 hdr = (struct ieee80211_hdr *) skb->data;
414 fc = hdr->frame_control;
415
416 rcu_read_lock();
417
418 sta = ieee80211_find_sta(vif, hdr->addr1);
419 if (!sta) {
420 rcu_read_unlock();
421 return;
422 }
423
424 if (sta && conf_is_ht(&priv->hw->conf) &&
425 !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
426 if (ieee80211_is_data_qos(fc)) {
427 u8 *qc, tid;
428 struct ath9k_htc_sta *ista;
429
430 qc = ieee80211_get_qos_ctl(hdr);
431 tid = qc[0] & 0xf;
432 ista = (struct ath9k_htc_sta *)sta->drv_priv;
433 if (__ath9k_htc_check_tx_aggr(priv, ista, tid)) {
434 ieee80211_start_tx_ba_session(sta, tid, 0);
435 spin_lock_bh(&priv->tx.tx_lock);
436 ista->tid_state[tid] = AGGR_PROGRESS;
437 spin_unlock_bh(&priv->tx.tx_lock);
438 }
439 }
440 }
441
442 rcu_read_unlock();
443 }
444
445 static void ath9k_htc_tx_process(struct ath9k_htc_priv *priv,
446 struct sk_buff *skb,
447 struct __wmi_event_txstatus *txs)
448 {
449 struct ieee80211_vif *vif;
450 struct ath9k_htc_tx_ctl *tx_ctl;
451 struct ieee80211_tx_info *tx_info;
452 struct ieee80211_tx_rate *rate;
453 struct ieee80211_conf *cur_conf = &priv->hw->conf;
454 bool txok;
455 int slot;
456 int hdrlen, padsize;
457
458 slot = strip_drv_header(priv, skb);
459 if (slot < 0) {
460 dev_kfree_skb_any(skb);
461 return;
462 }
463
464 tx_ctl = HTC_SKB_CB(skb);
465 txok = tx_ctl->txok;
466 tx_info = IEEE80211_SKB_CB(skb);
467 vif = tx_info->control.vif;
468 rate = &tx_info->status.rates[0];
469
470 memset(&tx_info->status, 0, sizeof(tx_info->status));
471
472 /*
473 * URB submission failed for this frame, it never reached
474 * the target.
475 */
476 if (!txok || !vif || !txs)
477 goto send_mac80211;
478
479 if (txs->ts_flags & ATH9K_HTC_TXSTAT_ACK) {
480 tx_info->flags |= IEEE80211_TX_STAT_ACK;
481 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
482 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
483 }
484
485 if (txs->ts_flags & ATH9K_HTC_TXSTAT_FILT)
486 tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
487
488 if (txs->ts_flags & ATH9K_HTC_TXSTAT_RTC_CTS)
489 rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
490
491 rate->count = 1;
492 rate->idx = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_RATE);
493
494 if (txs->ts_flags & ATH9K_HTC_TXSTAT_MCS) {
495 rate->flags |= IEEE80211_TX_RC_MCS;
496
497 if (txs->ts_flags & ATH9K_HTC_TXSTAT_CW40)
498 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
499 if (txs->ts_flags & ATH9K_HTC_TXSTAT_SGI)
500 rate->flags |= IEEE80211_TX_RC_SHORT_GI;
501 } else {
502 if (cur_conf->chandef.chan->band == NL80211_BAND_5GHZ)
503 rate->idx += 4; /* No CCK rates */
504 }
505
506 ath9k_htc_check_tx_aggr(priv, vif, skb);
507
508 send_mac80211:
509 spin_lock_bh(&priv->tx.tx_lock);
510 if (WARN_ON(--priv->tx.queued_cnt < 0))
511 priv->tx.queued_cnt = 0;
512 spin_unlock_bh(&priv->tx.tx_lock);
513
514 ath9k_htc_tx_clear_slot(priv, slot);
515
516 /* Remove padding before handing frame back to mac80211 */
517 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
518
519 padsize = hdrlen & 3;
520 if (padsize && skb->len > hdrlen + padsize) {
521 memmove(skb->data + padsize, skb->data, hdrlen);
522 skb_pull(skb, padsize);
523 }
524
525 /* Send status to mac80211 */
526 ieee80211_tx_status_skb(priv->hw, skb);
527 }
528
529 static inline void ath9k_htc_tx_drainq(struct ath9k_htc_priv *priv,
530 struct sk_buff_head *queue)
531 {
532 struct sk_buff *skb;
533
534 while ((skb = skb_dequeue(queue)) != NULL) {
535 ath9k_htc_tx_process(priv, skb, NULL);
536 }
537 }
538
539 void ath9k_htc_tx_drain(struct ath9k_htc_priv *priv)
540 {
541 struct ath9k_htc_tx_event *event, *tmp;
542
543 spin_lock_bh(&priv->tx.tx_lock);
544 priv->tx.flags |= ATH9K_HTC_OP_TX_DRAIN;
545 spin_unlock_bh(&priv->tx.tx_lock);
546
547 /*
548 * Ensure that all pending TX frames are flushed,
549 * and that the TX completion/failed tasklets is killed.
550 */
551 htc_stop(priv->htc);
552 tasklet_kill(&priv->wmi->wmi_event_tasklet);
553 tasklet_kill(&priv->tx_failed_tasklet);
554
555 ath9k_htc_tx_drainq(priv, &priv->tx.mgmt_ep_queue);
556 ath9k_htc_tx_drainq(priv, &priv->tx.cab_ep_queue);
557 ath9k_htc_tx_drainq(priv, &priv->tx.data_be_queue);
558 ath9k_htc_tx_drainq(priv, &priv->tx.data_bk_queue);
559 ath9k_htc_tx_drainq(priv, &priv->tx.data_vi_queue);
560 ath9k_htc_tx_drainq(priv, &priv->tx.data_vo_queue);
561 ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed);
562
563 /*
564 * The TX cleanup timer has already been killed.
565 */
566 spin_lock_bh(&priv->wmi->event_lock);
567 list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) {
568 list_del(&event->list);
569 kfree(event);
570 }
571 spin_unlock_bh(&priv->wmi->event_lock);
572
573 spin_lock_bh(&priv->tx.tx_lock);
574 priv->tx.flags &= ~ATH9K_HTC_OP_TX_DRAIN;
575 spin_unlock_bh(&priv->tx.tx_lock);
576 }
577
578 void ath9k_tx_failed_tasklet(struct tasklet_struct *t)
579 {
580 struct ath9k_htc_priv *priv = from_tasklet(priv, t, tx_failed_tasklet);
581
582 spin_lock(&priv->tx.tx_lock);
583 if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
584 spin_unlock(&priv->tx.tx_lock);
585 return;
586 }
587 spin_unlock(&priv->tx.tx_lock);
588
589 ath9k_htc_tx_drainq(priv, &priv->tx.tx_failed);
590 }
591
592 static inline bool check_cookie(struct ath9k_htc_priv *priv,
593 struct sk_buff *skb,
594 u8 cookie, u8 epid)
595 {
596 u8 fcookie = 0;
597
598 if (epid == priv->mgmt_ep) {
599 struct tx_mgmt_hdr *hdr;
600 hdr = (struct tx_mgmt_hdr *) skb->data;
601 fcookie = hdr->cookie;
602 } else if ((epid == priv->data_bk_ep) ||
603 (epid == priv->data_be_ep) ||
604 (epid == priv->data_vi_ep) ||
605 (epid == priv->data_vo_ep) ||
606 (epid == priv->cab_ep)) {
607 struct tx_frame_hdr *hdr;
608 hdr = (struct tx_frame_hdr *) skb->data;
609 fcookie = hdr->cookie;
610 }
611
612 if (fcookie == cookie)
613 return true;
614
615 return false;
616 }
617
618 static struct sk_buff* ath9k_htc_tx_get_packet(struct ath9k_htc_priv *priv,
619 struct __wmi_event_txstatus *txs)
620 {
621 struct ath_common *common = ath9k_hw_common(priv->ah);
622 struct sk_buff_head *epid_queue;
623 struct sk_buff *skb, *tmp;
624 unsigned long flags;
625 u8 epid = MS(txs->ts_rate, ATH9K_HTC_TXSTAT_EPID);
626
627 epid_queue = get_htc_epid_queue(priv, epid);
628 if (!epid_queue)
629 return NULL;
630
631 spin_lock_irqsave(&epid_queue->lock, flags);
632 skb_queue_walk_safe(epid_queue, skb, tmp) {
633 if (check_cookie(priv, skb, txs->cookie, epid)) {
634 __skb_unlink(skb, epid_queue);
635 spin_unlock_irqrestore(&epid_queue->lock, flags);
636 return skb;
637 }
638 }
639 spin_unlock_irqrestore(&epid_queue->lock, flags);
640
641 ath_dbg(common, XMIT, "No matching packet for cookie: %d, epid: %d\n",
642 txs->cookie, epid);
643
644 return NULL;
645 }
646
647 void ath9k_htc_txstatus(struct ath9k_htc_priv *priv, void *wmi_event)
648 {
649 struct wmi_event_txstatus *txs = wmi_event;
650 struct __wmi_event_txstatus *__txs;
651 struct sk_buff *skb;
652 struct ath9k_htc_tx_event *tx_pend;
653 int i;
654
655 if (WARN_ON_ONCE(txs->cnt > HTC_MAX_TX_STATUS))
656 return;
657
658 for (i = 0; i < txs->cnt; i++) {
659 __txs = &txs->txstatus[i];
660
661 skb = ath9k_htc_tx_get_packet(priv, __txs);
662 if (!skb) {
663 /*
664 * Store this event, so that the TX cleanup
665 * routine can check later for the needed packet.
666 */
667 tx_pend = kzalloc(sizeof(struct ath9k_htc_tx_event),
668 GFP_ATOMIC);
669 if (!tx_pend)
670 continue;
671
672 memcpy(&tx_pend->txs, __txs,
673 sizeof(struct __wmi_event_txstatus));
674
675 spin_lock(&priv->wmi->event_lock);
676 list_add_tail(&tx_pend->list,
677 &priv->wmi->pending_tx_events);
678 spin_unlock(&priv->wmi->event_lock);
679
680 continue;
681 }
682
683 ath9k_htc_tx_process(priv, skb, __txs);
684 }
685
686 /* Wake TX queues if needed */
687 ath9k_htc_check_wake_queues(priv);
688 }
689
690 void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,
691 enum htc_endpoint_id ep_id, bool txok)
692 {
693 struct ath9k_htc_priv *priv = drv_priv;
694 struct ath9k_htc_tx_ctl *tx_ctl;
695 struct sk_buff_head *epid_queue;
696
697 tx_ctl = HTC_SKB_CB(skb);
698 tx_ctl->txok = txok;
699 tx_ctl->timestamp = jiffies;
700
701 if (!txok) {
702 skb_queue_tail(&priv->tx.tx_failed, skb);
703 tasklet_schedule(&priv->tx_failed_tasklet);
704 return;
705 }
706
707 epid_queue = get_htc_epid_queue(priv, ep_id);
708 if (!epid_queue) {
709 dev_kfree_skb_any(skb);
710 return;
711 }
712
713 skb_queue_tail(epid_queue, skb);
714 }
715
716 static inline bool check_packet(struct ath9k_htc_priv *priv, struct sk_buff *skb)
717 {
718 struct ath_common *common = ath9k_hw_common(priv->ah);
719 struct ath9k_htc_tx_ctl *tx_ctl;
720
721 tx_ctl = HTC_SKB_CB(skb);
722
723 if (time_after(jiffies,
724 tx_ctl->timestamp +
725 msecs_to_jiffies(ATH9K_HTC_TX_TIMEOUT_INTERVAL))) {
726 ath_dbg(common, XMIT, "Dropping a packet due to TX timeout\n");
727 return true;
728 }
729
730 return false;
731 }
732
733 static void ath9k_htc_tx_cleanup_queue(struct ath9k_htc_priv *priv,
734 struct sk_buff_head *epid_queue)
735 {
736 bool process = false;
737 unsigned long flags;
738 struct sk_buff *skb, *tmp;
739 struct sk_buff_head queue;
740
741 skb_queue_head_init(&queue);
742
743 spin_lock_irqsave(&epid_queue->lock, flags);
744 skb_queue_walk_safe(epid_queue, skb, tmp) {
745 if (check_packet(priv, skb)) {
746 __skb_unlink(skb, epid_queue);
747 __skb_queue_tail(&queue, skb);
748 process = true;
749 }
750 }
751 spin_unlock_irqrestore(&epid_queue->lock, flags);
752
753 if (process) {
754 skb_queue_walk_safe(&queue, skb, tmp) {
755 __skb_unlink(skb, &queue);
756 ath9k_htc_tx_process(priv, skb, NULL);
757 }
758 }
759 }
760
761 void ath9k_htc_tx_cleanup_timer(struct timer_list *t)
762 {
763 struct ath9k_htc_priv *priv = from_timer(priv, t, tx.cleanup_timer);
764 struct ath_common *common = ath9k_hw_common(priv->ah);
765 struct ath9k_htc_tx_event *event, *tmp;
766 struct sk_buff *skb;
767
768 spin_lock(&priv->wmi->event_lock);
769 list_for_each_entry_safe(event, tmp, &priv->wmi->pending_tx_events, list) {
770
771 skb = ath9k_htc_tx_get_packet(priv, &event->txs);
772 if (skb) {
773 ath_dbg(common, XMIT,
774 "Found packet for cookie: %d, epid: %d\n",
775 event->txs.cookie,
776 MS(event->txs.ts_rate, ATH9K_HTC_TXSTAT_EPID));
777
778 ath9k_htc_tx_process(priv, skb, &event->txs);
779 list_del(&event->list);
780 kfree(event);
781 continue;
782 }
783
784 if (++event->count >= ATH9K_HTC_TX_TIMEOUT_COUNT) {
785 list_del(&event->list);
786 kfree(event);
787 }
788 }
789 spin_unlock(&priv->wmi->event_lock);
790
791 /*
792 * Check if status-pending packets have to be cleaned up.
793 */
794 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.mgmt_ep_queue);
795 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.cab_ep_queue);
796 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_be_queue);
797 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_bk_queue);
798 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vi_queue);
799 ath9k_htc_tx_cleanup_queue(priv, &priv->tx.data_vo_queue);
800
801 /* Wake TX queues if needed */
802 ath9k_htc_check_wake_queues(priv);
803
804 mod_timer(&priv->tx.cleanup_timer,
805 jiffies + msecs_to_jiffies(ATH9K_HTC_TX_CLEANUP_INTERVAL));
806 }
807
808 int ath9k_tx_init(struct ath9k_htc_priv *priv)
809 {
810 skb_queue_head_init(&priv->tx.mgmt_ep_queue);
811 skb_queue_head_init(&priv->tx.cab_ep_queue);
812 skb_queue_head_init(&priv->tx.data_be_queue);
813 skb_queue_head_init(&priv->tx.data_bk_queue);
814 skb_queue_head_init(&priv->tx.data_vi_queue);
815 skb_queue_head_init(&priv->tx.data_vo_queue);
816 skb_queue_head_init(&priv->tx.tx_failed);
817
818 return 0;
819 }
820
821 void ath9k_tx_cleanup(struct ath9k_htc_priv *priv)
822 {
823
824 }
825
826 bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv, int subtype)
827 {
828 struct ath_hw *ah = priv->ah;
829 struct ath_common *common = ath9k_hw_common(ah);
830 struct ath9k_tx_queue_info qi;
831 int qnum;
832
833 memset(&qi, 0, sizeof(qi));
834 ATH9K_HTC_INIT_TXQ(subtype);
835
836 qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi);
837 if (qnum == -1)
838 return false;
839
840 if (qnum >= ARRAY_SIZE(priv->hwq_map)) {
841 ath_err(common, "qnum %u out of range, max %zu!\n",
842 qnum, ARRAY_SIZE(priv->hwq_map));
843 ath9k_hw_releasetxqueue(ah, qnum);
844 return false;
845 }
846
847 priv->hwq_map[subtype] = qnum;
848 return true;
849 }
850
851 int ath9k_htc_cabq_setup(struct ath9k_htc_priv *priv)
852 {
853 struct ath9k_tx_queue_info qi;
854
855 memset(&qi, 0, sizeof(qi));
856 ATH9K_HTC_INIT_TXQ(0);
857
858 return ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_CAB, &qi);
859 }
860
861 /******/
862 /* RX */
863 /******/
864
865 /*
866 * Calculate the RX filter to be set in the HW.
867 */
868 u32 ath9k_htc_calcrxfilter(struct ath9k_htc_priv *priv)
869 {
870 #define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
871
872 struct ath_hw *ah = priv->ah;
873 u32 rfilt;
874
875 rfilt = (ath9k_hw_getrxfilter(ah) & RX_FILTER_PRESERVE)
876 | ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
877 | ATH9K_RX_FILTER_MCAST;
878
879 if (priv->rxfilter & FIF_PROBE_REQ)
880 rfilt |= ATH9K_RX_FILTER_PROBEREQ;
881
882 if (ah->is_monitoring)
883 rfilt |= ATH9K_RX_FILTER_PROM;
884
885 if (priv->rxfilter & FIF_CONTROL)
886 rfilt |= ATH9K_RX_FILTER_CONTROL;
887
888 if ((ah->opmode == NL80211_IFTYPE_STATION) &&
889 (priv->nvifs <= 1) &&
890 !(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC))
891 rfilt |= ATH9K_RX_FILTER_MYBEACON;
892 else
893 rfilt |= ATH9K_RX_FILTER_BEACON;
894
895 if (conf_is_ht(&priv->hw->conf)) {
896 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
897 rfilt |= ATH9K_RX_FILTER_UNCOMP_BA_BAR;
898 }
899
900 if (priv->rxfilter & FIF_PSPOLL)
901 rfilt |= ATH9K_RX_FILTER_PSPOLL;
902
903 if (priv->nvifs > 1 ||
904 priv->rxfilter & (FIF_OTHER_BSS | FIF_MCAST_ACTION))
905 rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
906
907 return rfilt;
908
909 #undef RX_FILTER_PRESERVE
910 }
911
912 /*
913 * Recv initialization for opmode change.
914 */
915 static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv)
916 {
917 struct ath_hw *ah = priv->ah;
918 u32 rfilt, mfilt[2];
919
920 /* configure rx filter */
921 rfilt = ath9k_htc_calcrxfilter(priv);
922 ath9k_hw_setrxfilter(ah, rfilt);
923
924 /* calculate and install multicast filter */
925 mfilt[0] = mfilt[1] = ~0;
926 ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
927 }
928
929 void ath9k_host_rx_init(struct ath9k_htc_priv *priv)
930 {
931 struct ath_common *common = ath9k_hw_common(priv->ah);
932 ath9k_hw_rxena(priv->ah);
933 ath9k_htc_opmode_init(priv);
934 ath9k_hw_startpcureceive(priv->ah, test_bit(ATH_OP_SCANNING, &common->op_flags));
935 }
936
937 static inline void convert_htc_flag(struct ath_rx_status *rx_stats,
938 struct ath_htc_rx_status *rxstatus)
939 {
940 rx_stats->enc_flags = 0;
941 rx_stats->bw = RATE_INFO_BW_20;
942 if (rxstatus->rs_flags & ATH9K_RX_2040)
943 rx_stats->bw = RATE_INFO_BW_40;
944 if (rxstatus->rs_flags & ATH9K_RX_GI)
945 rx_stats->enc_flags |= RX_ENC_FLAG_SHORT_GI;
946 }
947
948 static void rx_status_htc_to_ath(struct ath_rx_status *rx_stats,
949 struct ath_htc_rx_status *rxstatus)
950 {
951 rx_stats->rs_datalen = be16_to_cpu(rxstatus->rs_datalen);
952 rx_stats->rs_status = rxstatus->rs_status;
953 rx_stats->rs_phyerr = rxstatus->rs_phyerr;
954 rx_stats->rs_rssi = rxstatus->rs_rssi;
955 rx_stats->rs_keyix = rxstatus->rs_keyix;
956 rx_stats->rs_rate = rxstatus->rs_rate;
957 rx_stats->rs_antenna = rxstatus->rs_antenna;
958 rx_stats->rs_more = rxstatus->rs_more;
959
960 memcpy(rx_stats->rs_rssi_ctl, rxstatus->rs_rssi_ctl,
961 sizeof(rx_stats->rs_rssi_ctl));
962 memcpy(rx_stats->rs_rssi_ext, rxstatus->rs_rssi_ext,
963 sizeof(rx_stats->rs_rssi_ext));
964
965 rx_stats->rs_isaggr = rxstatus->rs_isaggr;
966 rx_stats->rs_moreaggr = rxstatus->rs_moreaggr;
967 rx_stats->rs_num_delims = rxstatus->rs_num_delims;
968 convert_htc_flag(rx_stats, rxstatus);
969 }
970
971 static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
972 struct ath9k_htc_rxbuf *rxbuf,
973 struct ieee80211_rx_status *rx_status)
974
975 {
976 struct ieee80211_hdr *hdr;
977 struct ieee80211_hw *hw = priv->hw;
978 struct sk_buff *skb = rxbuf->skb;
979 struct ath_common *common = ath9k_hw_common(priv->ah);
980 struct ath_hw *ah = common->ah;
981 struct ath_htc_rx_status *rxstatus;
982 struct ath_rx_status rx_stats;
983 bool decrypt_error = false;
984 u16 rs_datalen;
985 bool is_phyerr;
986
987 if (skb->len < HTC_RX_FRAME_HEADER_SIZE) {
988 ath_err(common, "Corrupted RX frame, dropping (len: %d)\n",
989 skb->len);
990 goto rx_next;
991 }
992
993 rxstatus = (struct ath_htc_rx_status *)skb->data;
994
995 rs_datalen = be16_to_cpu(rxstatus->rs_datalen);
996 if (unlikely(rs_datalen -
997 (skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0)) {
998 ath_err(common,
999 "Corrupted RX data len, dropping (dlen: %d, skblen: %d)\n",
1000 rs_datalen, skb->len);
1001 goto rx_next;
1002 }
1003
1004 is_phyerr = rxstatus->rs_status & ATH9K_RXERR_PHY;
1005 /*
1006 * Discard zero-length packets and packets smaller than an ACK
1007 * which are not PHY_ERROR (short radar pulses have a length of 3)
1008 */
1009 if (unlikely(!rs_datalen || (rs_datalen < 10 && !is_phyerr))) {
1010 ath_dbg(common, ANY,
1011 "Short RX data len, dropping (dlen: %d)\n",
1012 rs_datalen);
1013 goto rx_next;
1014 }
1015
1016 if (rxstatus->rs_keyix >= ATH_KEYMAX &&
1017 rxstatus->rs_keyix != ATH9K_RXKEYIX_INVALID) {
1018 ath_dbg(common, ANY,
1019 "Invalid keyix, dropping (keyix: %d)\n",
1020 rxstatus->rs_keyix);
1021 goto rx_next;
1022 }
1023
1024 /* Get the RX status information */
1025
1026 memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
1027
1028 /* Copy everything from ath_htc_rx_status (HTC_RX_FRAME_HEADER).
1029 * After this, we can drop this part of skb. */
1030 rx_status_htc_to_ath(&rx_stats, rxstatus);
1031 ath9k_htc_err_stat_rx(priv, &rx_stats);
1032 rx_status->mactime = be64_to_cpu(rxstatus->rs_tstamp);
1033 skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
1034
1035 /*
1036 * everything but the rate is checked here, the rate check is done
1037 * separately to avoid doing two lookups for a rate for each frame.
1038 */
1039 hdr = (struct ieee80211_hdr *)skb->data;
1040
1041 /*
1042 * Process PHY errors and return so that the packet
1043 * can be dropped.
1044 */
1045 if (unlikely(is_phyerr)) {
1046 /* TODO: Not using DFS processing now. */
1047 if (ath_cmn_process_fft(&priv->spec_priv, hdr,
1048 &rx_stats, rx_status->mactime)) {
1049 /* TODO: Code to collect spectral scan statistics */
1050 }
1051 goto rx_next;
1052 }
1053
1054 if (!ath9k_cmn_rx_accept(common, hdr, rx_status, &rx_stats,
1055 &decrypt_error, priv->rxfilter))
1056 goto rx_next;
1057
1058 ath9k_cmn_rx_skb_postprocess(common, skb, &rx_stats,
1059 rx_status, decrypt_error);
1060
1061 if (ath9k_cmn_process_rate(common, hw, &rx_stats, rx_status))
1062 goto rx_next;
1063
1064 rx_stats.is_mybeacon = ath_is_mybeacon(common, hdr);
1065 ath9k_cmn_process_rssi(common, hw, &rx_stats, rx_status);
1066
1067 rx_status->band = ah->curchan->chan->band;
1068 rx_status->freq = ah->curchan->chan->center_freq;
1069 rx_status->antenna = rx_stats.rs_antenna;
1070 rx_status->flag |= RX_FLAG_MACTIME_END;
1071
1072 return true;
1073 rx_next:
1074 return false;
1075 }
1076
1077 /*
1078 * FIXME: Handle FLUSH later on.
1079 */
1080 void ath9k_rx_tasklet(struct tasklet_struct *t)
1081 {
1082 struct ath9k_htc_priv *priv = from_tasklet(priv, t, rx_tasklet);
1083 struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
1084 struct ieee80211_rx_status rx_status;
1085 struct sk_buff *skb;
1086 unsigned long flags;
1087 struct ieee80211_hdr *hdr;
1088
1089 do {
1090 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1091 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
1092 if (tmp_buf->in_process) {
1093 rxbuf = tmp_buf;
1094 break;
1095 }
1096 }
1097
1098 if (rxbuf == NULL) {
1099 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1100 break;
1101 }
1102
1103 if (!rxbuf->skb)
1104 goto requeue;
1105
1106 if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) {
1107 dev_kfree_skb_any(rxbuf->skb);
1108 goto requeue;
1109 }
1110
1111 memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
1112 sizeof(struct ieee80211_rx_status));
1113 skb = rxbuf->skb;
1114 hdr = (struct ieee80211_hdr *) skb->data;
1115
1116 if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled)
1117 ieee80211_queue_work(priv->hw, &priv->ps_work);
1118
1119 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1120
1121 ieee80211_rx(priv->hw, skb);
1122
1123 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1124 requeue:
1125 rxbuf->in_process = false;
1126 rxbuf->skb = NULL;
1127 list_move_tail(&rxbuf->list, &priv->rx.rxbuf);
1128 rxbuf = NULL;
1129 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1130 } while (1);
1131
1132 }
1133
1134 void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb,
1135 enum htc_endpoint_id ep_id)
1136 {
1137 struct ath9k_htc_priv *priv = drv_priv;
1138 struct ath_hw *ah = priv->ah;
1139 struct ath_common *common = ath9k_hw_common(ah);
1140 struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
1141 unsigned long flags;
1142
1143 /* Check if ath9k_rx_init() completed. */
1144 if (!data_race(priv->rx.initialized))
1145 goto err;
1146
1147 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1148 list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
1149 if (!tmp_buf->in_process) {
1150 rxbuf = tmp_buf;
1151 break;
1152 }
1153 }
1154 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1155
1156 if (rxbuf == NULL) {
1157 ath_dbg(common, ANY, "No free RX buffer\n");
1158 goto err;
1159 }
1160
1161 spin_lock_irqsave(&priv->rx.rxbuflock, flags);
1162 rxbuf->skb = skb;
1163 rxbuf->in_process = true;
1164 spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
1165
1166 tasklet_schedule(&priv->rx_tasklet);
1167 return;
1168 err:
1169 dev_kfree_skb_any(skb);
1170 }
1171
1172 /* FIXME: Locking for cleanup/init */
1173
1174 void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
1175 {
1176 struct ath9k_htc_rxbuf *rxbuf, *tbuf;
1177
1178 list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
1179 list_del(&rxbuf->list);
1180 if (rxbuf->skb)
1181 dev_kfree_skb_any(rxbuf->skb);
1182 kfree(rxbuf);
1183 }
1184 }
1185
1186 int ath9k_rx_init(struct ath9k_htc_priv *priv)
1187 {
1188 int i = 0;
1189
1190 INIT_LIST_HEAD(&priv->rx.rxbuf);
1191 spin_lock_init(&priv->rx.rxbuflock);
1192
1193 for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
1194 struct ath9k_htc_rxbuf *rxbuf =
1195 kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
1196 if (rxbuf == NULL)
1197 goto err;
1198
1199 list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
1200 }
1201
1202 /* Allow ath9k_htc_rxep() to operate. */
1203 smp_wmb();
1204 priv->rx.initialized = true;
1205
1206 return 0;
1207
1208 err:
1209 ath9k_rx_cleanup(priv);
1210 return -ENOMEM;
1211 }
Kernel DRM miscellaneous fixes and cross-tree changes