2 * mac80211 - channel management
5 #include <linux/nl80211.h>
6 #include <linux/export.h>
7 #include <linux/rtnetlink.h>
8 #include <net/cfg80211.h>
9 #include "ieee80211_i.h"
10 #include "driver-ops.h"
12 static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
13 struct ieee80211_chanctx *ctx)
15 struct ieee80211_sub_if_data *sdata;
18 lockdep_assert_held(&local->chanctx_mtx);
20 list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
26 static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local,
27 struct ieee80211_chanctx *ctx)
29 struct ieee80211_sub_if_data *sdata;
32 lockdep_assert_held(&local->chanctx_mtx);
34 list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
40 int ieee80211_chanctx_refcount(struct ieee80211_local *local,
41 struct ieee80211_chanctx *ctx)
43 return ieee80211_chanctx_num_assigned(local, ctx) +
44 ieee80211_chanctx_num_reserved(local, ctx);
47 static int ieee80211_num_chanctx(struct ieee80211_local *local)
49 struct ieee80211_chanctx *ctx;
52 lockdep_assert_held(&local->chanctx_mtx);
54 list_for_each_entry(ctx, &local->chanctx_list, list)
60 static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local)
62 lockdep_assert_held(&local->chanctx_mtx);
63 return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);
66 static struct ieee80211_chanctx *
67 ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata)
69 struct ieee80211_local *local __maybe_unused = sdata->local;
70 struct ieee80211_chanctx_conf *conf;
72 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
73 lockdep_is_held(&local->chanctx_mtx));
77 return container_of(conf, struct ieee80211_chanctx, conf);
80 static const struct cfg80211_chan_def *
81 ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local,
82 struct ieee80211_chanctx *ctx,
83 const struct cfg80211_chan_def *compat)
85 struct ieee80211_sub_if_data *sdata;
87 lockdep_assert_held(&local->chanctx_mtx);
89 list_for_each_entry(sdata, &ctx->reserved_vifs,
90 reserved_chanctx_list) {
92 compat = &sdata->reserved_chandef;
94 compat = cfg80211_chandef_compatible(&sdata->reserved_chandef,
103 static const struct cfg80211_chan_def *
104 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
105 struct ieee80211_chanctx *ctx,
106 const struct cfg80211_chan_def *compat)
108 struct ieee80211_sub_if_data *sdata;
110 lockdep_assert_held(&local->chanctx_mtx);
112 list_for_each_entry(sdata, &ctx->assigned_vifs,
113 assigned_chanctx_list) {
114 if (sdata->reserved_chanctx != NULL)
118 compat = &sdata->vif.bss_conf.chandef;
120 compat = cfg80211_chandef_compatible(
121 &sdata->vif.bss_conf.chandef, compat);
129 static const struct cfg80211_chan_def *
130 ieee80211_chanctx_combined_chandef(struct ieee80211_local *local,
131 struct ieee80211_chanctx *ctx,
132 const struct cfg80211_chan_def *compat)
134 lockdep_assert_held(&local->chanctx_mtx);
136 compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat);
140 compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat);
148 ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local,
149 struct ieee80211_chanctx *ctx,
150 const struct cfg80211_chan_def *def)
152 lockdep_assert_held(&local->chanctx_mtx);
154 if (ieee80211_chanctx_combined_chandef(local, ctx, def))
157 if (!list_empty(&ctx->reserved_vifs) &&
158 ieee80211_chanctx_reserved_chandef(local, ctx, def))
164 static struct ieee80211_chanctx *
165 ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
166 const struct cfg80211_chan_def *chandef,
167 enum ieee80211_chanctx_mode mode)
169 struct ieee80211_chanctx *ctx;
171 lockdep_assert_held(&local->chanctx_mtx);
173 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
176 list_for_each_entry(ctx, &local->chanctx_list, list) {
177 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
180 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
183 if (!ieee80211_chanctx_can_reserve_chandef(local, ctx,
193 static enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta)
195 switch (sta->bandwidth) {
196 case IEEE80211_STA_RX_BW_20:
197 if (sta->ht_cap.ht_supported)
198 return NL80211_CHAN_WIDTH_20;
200 return NL80211_CHAN_WIDTH_20_NOHT;
201 case IEEE80211_STA_RX_BW_40:
202 return NL80211_CHAN_WIDTH_40;
203 case IEEE80211_STA_RX_BW_80:
204 return NL80211_CHAN_WIDTH_80;
205 case IEEE80211_STA_RX_BW_160:
207 * This applied for both 160 and 80+80. since we use
208 * the returned value to consider degradation of
209 * ctx->conf.min_def, we have to make sure to take
210 * the bigger one (NL80211_CHAN_WIDTH_160).
211 * Otherwise we might try degrading even when not
212 * needed, as the max required sta_bw returned (80+80)
213 * might be smaller than the configured bw (160).
215 return NL80211_CHAN_WIDTH_160;
218 return NL80211_CHAN_WIDTH_20;
222 static enum nl80211_chan_width
223 ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
225 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
226 struct sta_info *sta;
229 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
230 if (sdata != sta->sdata &&
231 !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
237 max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta));
244 static enum nl80211_chan_width
245 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
246 struct ieee80211_chanctx_conf *conf)
248 struct ieee80211_sub_if_data *sdata;
249 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
252 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
253 struct ieee80211_vif *vif = &sdata->vif;
254 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
256 if (!ieee80211_sdata_running(sdata))
259 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
263 case NL80211_IFTYPE_AP:
264 case NL80211_IFTYPE_AP_VLAN:
265 width = ieee80211_get_max_required_bw(sdata);
267 case NL80211_IFTYPE_P2P_DEVICE:
269 case NL80211_IFTYPE_STATION:
270 case NL80211_IFTYPE_ADHOC:
271 case NL80211_IFTYPE_WDS:
272 case NL80211_IFTYPE_MESH_POINT:
273 width = vif->bss_conf.chandef.width;
275 case NL80211_IFTYPE_UNSPECIFIED:
276 case NUM_NL80211_IFTYPES:
277 case NL80211_IFTYPE_MONITOR:
278 case NL80211_IFTYPE_P2P_CLIENT:
279 case NL80211_IFTYPE_P2P_GO:
282 max_bw = max(max_bw, width);
285 /* use the configured bandwidth in case of monitor interface */
286 sdata = rcu_dereference(local->monitor_sdata);
287 if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
288 max_bw = max(max_bw, conf->def.width);
296 * recalc the min required chan width of the channel context, which is
297 * the max of min required widths of all the interfaces bound to this
300 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
301 struct ieee80211_chanctx *ctx)
303 enum nl80211_chan_width max_bw;
304 struct cfg80211_chan_def min_def;
306 lockdep_assert_held(&local->chanctx_mtx);
308 /* don't optimize 5MHz, 10MHz, and radar_enabled confs */
309 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
310 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
311 ctx->conf.radar_enabled) {
312 ctx->conf.min_def = ctx->conf.def;
316 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
318 /* downgrade chandef up to max_bw */
319 min_def = ctx->conf.def;
320 while (min_def.width > max_bw)
321 ieee80211_chandef_downgrade(&min_def);
323 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
326 ctx->conf.min_def = min_def;
327 if (!ctx->driver_present)
330 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
333 static void ieee80211_change_chanctx(struct ieee80211_local *local,
334 struct ieee80211_chanctx *ctx,
335 const struct cfg80211_chan_def *chandef)
337 if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
340 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
342 ctx->conf.def = *chandef;
343 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
344 ieee80211_recalc_chanctx_min_def(local, ctx);
346 if (!local->use_chanctx) {
347 local->_oper_chandef = *chandef;
348 ieee80211_hw_config(local, 0);
352 static struct ieee80211_chanctx *
353 ieee80211_find_chanctx(struct ieee80211_local *local,
354 const struct cfg80211_chan_def *chandef,
355 enum ieee80211_chanctx_mode mode)
357 struct ieee80211_chanctx *ctx;
359 lockdep_assert_held(&local->chanctx_mtx);
361 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
364 list_for_each_entry(ctx, &local->chanctx_list, list) {
365 const struct cfg80211_chan_def *compat;
367 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
370 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
373 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
377 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
382 ieee80211_change_chanctx(local, ctx, compat);
390 static bool ieee80211_is_radar_required(struct ieee80211_local *local)
392 struct ieee80211_sub_if_data *sdata;
394 lockdep_assert_held(&local->mtx);
397 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
398 if (sdata->radar_required) {
408 static struct ieee80211_chanctx *
409 ieee80211_alloc_chanctx(struct ieee80211_local *local,
410 const struct cfg80211_chan_def *chandef,
411 enum ieee80211_chanctx_mode mode)
413 struct ieee80211_chanctx *ctx;
415 lockdep_assert_held(&local->chanctx_mtx);
417 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
421 INIT_LIST_HEAD(&ctx->assigned_vifs);
422 INIT_LIST_HEAD(&ctx->reserved_vifs);
423 ctx->conf.def = *chandef;
424 ctx->conf.rx_chains_static = 1;
425 ctx->conf.rx_chains_dynamic = 1;
427 ctx->conf.radar_enabled = ieee80211_is_radar_required(local);
428 ieee80211_recalc_chanctx_min_def(local, ctx);
433 static int ieee80211_add_chanctx(struct ieee80211_local *local,
434 struct ieee80211_chanctx *ctx)
439 lockdep_assert_held(&local->mtx);
440 lockdep_assert_held(&local->chanctx_mtx);
442 if (!local->use_chanctx)
443 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
445 /* turn idle off *before* setting channel -- some drivers need that */
446 changed = ieee80211_idle_off(local);
448 ieee80211_hw_config(local, changed);
450 if (!local->use_chanctx) {
451 local->_oper_chandef = ctx->conf.def;
452 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
454 err = drv_add_chanctx(local, ctx);
456 ieee80211_recalc_idle(local);
464 static struct ieee80211_chanctx *
465 ieee80211_new_chanctx(struct ieee80211_local *local,
466 const struct cfg80211_chan_def *chandef,
467 enum ieee80211_chanctx_mode mode)
469 struct ieee80211_chanctx *ctx;
472 lockdep_assert_held(&local->mtx);
473 lockdep_assert_held(&local->chanctx_mtx);
475 ctx = ieee80211_alloc_chanctx(local, chandef, mode);
477 return ERR_PTR(-ENOMEM);
479 err = ieee80211_add_chanctx(local, ctx);
485 list_add_rcu(&ctx->list, &local->chanctx_list);
489 static void ieee80211_del_chanctx(struct ieee80211_local *local,
490 struct ieee80211_chanctx *ctx)
492 lockdep_assert_held(&local->chanctx_mtx);
494 if (!local->use_chanctx) {
495 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
496 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
497 chandef->center_freq1 = chandef->chan->center_freq;
498 chandef->center_freq2 = 0;
500 /* NOTE: Disabling radar is only valid here for
501 * single channel context. To be sure, check it ...
503 WARN_ON(local->hw.conf.radar_enabled &&
504 !list_empty(&local->chanctx_list));
506 local->hw.conf.radar_enabled = false;
508 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
510 drv_remove_chanctx(local, ctx);
513 ieee80211_recalc_idle(local);
516 static void ieee80211_free_chanctx(struct ieee80211_local *local,
517 struct ieee80211_chanctx *ctx)
519 lockdep_assert_held(&local->chanctx_mtx);
521 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
523 list_del_rcu(&ctx->list);
524 ieee80211_del_chanctx(local, ctx);
525 kfree_rcu(ctx, rcu_head);
528 static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
529 struct ieee80211_chanctx *ctx)
531 struct ieee80211_chanctx_conf *conf = &ctx->conf;
532 struct ieee80211_sub_if_data *sdata;
533 const struct cfg80211_chan_def *compat = NULL;
535 lockdep_assert_held(&local->chanctx_mtx);
538 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
540 if (!ieee80211_sdata_running(sdata))
542 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
544 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
548 compat = &sdata->vif.bss_conf.chandef;
550 compat = cfg80211_chandef_compatible(
551 &sdata->vif.bss_conf.chandef, compat);
552 if (WARN_ON_ONCE(!compat))
560 ieee80211_change_chanctx(local, ctx, compat);
563 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
564 struct ieee80211_chanctx *chanctx)
568 lockdep_assert_held(&local->chanctx_mtx);
569 /* for setting local->radar_detect_enabled */
570 lockdep_assert_held(&local->mtx);
572 radar_enabled = ieee80211_is_radar_required(local);
574 if (radar_enabled == chanctx->conf.radar_enabled)
577 chanctx->conf.radar_enabled = radar_enabled;
578 local->radar_detect_enabled = chanctx->conf.radar_enabled;
580 if (!local->use_chanctx) {
581 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
582 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
585 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
588 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
589 struct ieee80211_chanctx *new_ctx)
591 struct ieee80211_local *local = sdata->local;
592 struct ieee80211_chanctx_conf *conf;
593 struct ieee80211_chanctx *curr_ctx = NULL;
596 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
597 lockdep_is_held(&local->chanctx_mtx));
600 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
602 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
604 list_del(&sdata->assigned_chanctx_list);
608 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
612 conf = &new_ctx->conf;
613 list_add(&sdata->assigned_chanctx_list,
614 &new_ctx->assigned_vifs);
618 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
620 sdata->vif.bss_conf.idle = !conf;
622 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
623 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
624 ieee80211_recalc_smps_chanctx(local, curr_ctx);
625 ieee80211_recalc_radar_chanctx(local, curr_ctx);
626 ieee80211_recalc_chanctx_min_def(local, curr_ctx);
629 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
630 ieee80211_recalc_txpower(sdata);
631 ieee80211_recalc_chanctx_min_def(local, new_ctx);
634 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
635 sdata->vif.type != NL80211_IFTYPE_MONITOR)
636 ieee80211_bss_info_change_notify(sdata,
642 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
643 struct ieee80211_chanctx *chanctx)
645 struct ieee80211_sub_if_data *sdata;
646 u8 rx_chains_static, rx_chains_dynamic;
648 lockdep_assert_held(&local->chanctx_mtx);
650 rx_chains_static = 1;
651 rx_chains_dynamic = 1;
654 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
655 u8 needed_static, needed_dynamic;
657 if (!ieee80211_sdata_running(sdata))
660 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
664 switch (sdata->vif.type) {
665 case NL80211_IFTYPE_P2P_DEVICE:
667 case NL80211_IFTYPE_STATION:
668 if (!sdata->u.mgd.associated)
671 case NL80211_IFTYPE_AP_VLAN:
673 case NL80211_IFTYPE_AP:
674 case NL80211_IFTYPE_ADHOC:
675 case NL80211_IFTYPE_WDS:
676 case NL80211_IFTYPE_MESH_POINT:
682 switch (sdata->smps_mode) {
684 WARN_ONCE(1, "Invalid SMPS mode %d\n",
687 case IEEE80211_SMPS_OFF:
688 needed_static = sdata->needed_rx_chains;
689 needed_dynamic = sdata->needed_rx_chains;
691 case IEEE80211_SMPS_DYNAMIC:
693 needed_dynamic = sdata->needed_rx_chains;
695 case IEEE80211_SMPS_STATIC:
701 rx_chains_static = max(rx_chains_static, needed_static);
702 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
705 /* Disable SMPS for the monitor interface */
706 sdata = rcu_dereference(local->monitor_sdata);
708 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
709 rx_chains_dynamic = rx_chains_static = local->rx_chains;
713 if (!local->use_chanctx) {
714 if (rx_chains_static > 1)
715 local->smps_mode = IEEE80211_SMPS_OFF;
716 else if (rx_chains_dynamic > 1)
717 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
719 local->smps_mode = IEEE80211_SMPS_STATIC;
720 ieee80211_hw_config(local, 0);
723 if (rx_chains_static == chanctx->conf.rx_chains_static &&
724 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
727 chanctx->conf.rx_chains_static = rx_chains_static;
728 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
729 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
733 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
736 struct ieee80211_local *local __maybe_unused = sdata->local;
737 struct ieee80211_sub_if_data *vlan;
738 struct ieee80211_chanctx_conf *conf;
740 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
743 lockdep_assert_held(&local->mtx);
745 /* Check that conf exists, even when clearing this function
746 * must be called with the AP's channel context still there
747 * as it would otherwise cause VLANs to have an invalid
748 * channel context pointer for a while, possibly pointing
749 * to a channel context that has already been freed.
751 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
752 lockdep_is_held(&local->chanctx_mtx));
758 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
759 rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
762 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
765 struct ieee80211_local *local = sdata->local;
767 mutex_lock(&local->chanctx_mtx);
769 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
771 mutex_unlock(&local->chanctx_mtx);
774 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
776 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
778 lockdep_assert_held(&sdata->local->chanctx_mtx);
783 list_del(&sdata->reserved_chanctx_list);
784 sdata->reserved_chanctx = NULL;
786 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
787 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
788 if (WARN_ON(!ctx->replace_ctx))
791 WARN_ON(ctx->replace_ctx->replace_state !=
792 IEEE80211_CHANCTX_WILL_BE_REPLACED);
793 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
795 ctx->replace_ctx->replace_ctx = NULL;
796 ctx->replace_ctx->replace_state =
797 IEEE80211_CHANCTX_REPLACE_NONE;
799 list_del_rcu(&ctx->list);
800 kfree_rcu(ctx, rcu_head);
802 ieee80211_free_chanctx(sdata->local, ctx);
809 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
810 const struct cfg80211_chan_def *chandef,
811 enum ieee80211_chanctx_mode mode,
814 struct ieee80211_local *local = sdata->local;
815 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
817 lockdep_assert_held(&local->chanctx_mtx);
819 curr_ctx = ieee80211_vif_get_chanctx(sdata);
820 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
823 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
825 if (ieee80211_can_create_new_chanctx(local)) {
826 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
828 return PTR_ERR(new_ctx);
831 (curr_ctx->replace_state ==
832 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
833 !list_empty(&curr_ctx->reserved_vifs)) {
835 * Another vif already requested this context
836 * for a reservation. Find another one hoping
837 * all vifs assigned to it will also switch
840 * TODO: This needs a little more work as some
841 * cases (more than 2 chanctx capable devices)
842 * may fail which could otherwise succeed
843 * provided some channel context juggling was
846 * Consider ctx1..3, vif1..6, each ctx has 2
847 * vifs. vif1 and vif2 from ctx1 request new
848 * different chandefs starting 2 in-place
849 * reserations with ctx4 and ctx5 replacing
850 * ctx1 and ctx2 respectively. Next vif5 and
851 * vif6 from ctx3 reserve ctx4. If vif3 and
852 * vif4 remain on ctx2 as they are then this
853 * fails unless `replace_ctx` from ctx5 is
854 * replaced with ctx3.
856 list_for_each_entry(ctx, &local->chanctx_list,
858 if (ctx->replace_state !=
859 IEEE80211_CHANCTX_REPLACE_NONE)
862 if (!list_empty(&ctx->reserved_vifs))
871 * If that's true then all available contexts already
872 * have reservations and cannot be used.
875 (curr_ctx->replace_state ==
876 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
877 !list_empty(&curr_ctx->reserved_vifs))
880 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
884 new_ctx->replace_ctx = curr_ctx;
885 new_ctx->replace_state =
886 IEEE80211_CHANCTX_REPLACES_OTHER;
888 curr_ctx->replace_ctx = new_ctx;
889 curr_ctx->replace_state =
890 IEEE80211_CHANCTX_WILL_BE_REPLACED;
892 list_add_rcu(&new_ctx->list, &local->chanctx_list);
896 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
897 sdata->reserved_chanctx = new_ctx;
898 sdata->reserved_chandef = *chandef;
899 sdata->reserved_radar_required = radar_required;
900 sdata->reserved_ready = false;
906 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
908 switch (sdata->vif.type) {
909 case NL80211_IFTYPE_ADHOC:
910 case NL80211_IFTYPE_AP:
911 case NL80211_IFTYPE_MESH_POINT:
912 ieee80211_queue_work(&sdata->local->hw,
913 &sdata->csa_finalize_work);
915 case NL80211_IFTYPE_STATION:
916 ieee80211_queue_work(&sdata->local->hw,
917 &sdata->u.mgd.chswitch_work);
919 case NL80211_IFTYPE_UNSPECIFIED:
920 case NL80211_IFTYPE_AP_VLAN:
921 case NL80211_IFTYPE_WDS:
922 case NL80211_IFTYPE_MONITOR:
923 case NL80211_IFTYPE_P2P_CLIENT:
924 case NL80211_IFTYPE_P2P_GO:
925 case NL80211_IFTYPE_P2P_DEVICE:
926 case NUM_NL80211_IFTYPES:
933 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
935 struct ieee80211_local *local = sdata->local;
936 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
937 struct ieee80211_chanctx *old_ctx, *new_ctx;
938 const struct cfg80211_chan_def *chandef;
942 lockdep_assert_held(&local->mtx);
943 lockdep_assert_held(&local->chanctx_mtx);
945 new_ctx = sdata->reserved_chanctx;
946 old_ctx = ieee80211_vif_get_chanctx(sdata);
948 if (WARN_ON(!sdata->reserved_ready))
951 if (WARN_ON(!new_ctx))
954 if (WARN_ON(!old_ctx))
957 if (WARN_ON(new_ctx->replace_state ==
958 IEEE80211_CHANCTX_REPLACES_OTHER))
961 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
962 &sdata->reserved_chandef);
963 if (WARN_ON(!chandef))
966 vif_chsw[0].vif = &sdata->vif;
967 vif_chsw[0].old_ctx = &old_ctx->conf;
968 vif_chsw[0].new_ctx = &new_ctx->conf;
970 list_del(&sdata->reserved_chanctx_list);
971 sdata->reserved_chanctx = NULL;
973 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
974 CHANCTX_SWMODE_REASSIGN_VIF);
976 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
977 ieee80211_free_chanctx(local, new_ctx);
982 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
983 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
985 if (sdata->vif.type == NL80211_IFTYPE_AP)
986 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
988 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
989 ieee80211_free_chanctx(local, old_ctx);
991 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
992 changed = BSS_CHANGED_BANDWIDTH;
994 sdata->vif.bss_conf.chandef = sdata->reserved_chandef;
997 ieee80211_bss_info_change_notify(sdata, changed);
1000 ieee80211_vif_chanctx_reservation_complete(sdata);
1005 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
1007 struct ieee80211_local *local = sdata->local;
1008 struct ieee80211_chanctx *old_ctx, *new_ctx;
1009 const struct cfg80211_chan_def *chandef;
1012 old_ctx = ieee80211_vif_get_chanctx(sdata);
1013 new_ctx = sdata->reserved_chanctx;
1015 if (WARN_ON(!sdata->reserved_ready))
1018 if (WARN_ON(old_ctx))
1021 if (WARN_ON(!new_ctx))
1024 if (WARN_ON(new_ctx->replace_state ==
1025 IEEE80211_CHANCTX_REPLACES_OTHER))
1028 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1029 &sdata->reserved_chandef);
1030 if (WARN_ON(!chandef))
1033 list_del(&sdata->reserved_chanctx_list);
1034 sdata->reserved_chanctx = NULL;
1036 err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
1038 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1039 ieee80211_free_chanctx(local, new_ctx);
1045 ieee80211_vif_chanctx_reservation_complete(sdata);
1050 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
1052 struct ieee80211_chanctx *old_ctx, *new_ctx;
1054 lockdep_assert_held(&sdata->local->chanctx_mtx);
1056 new_ctx = sdata->reserved_chanctx;
1057 old_ctx = ieee80211_vif_get_chanctx(sdata);
1062 if (WARN_ON(!new_ctx))
1065 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1068 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1074 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1075 struct ieee80211_chanctx *new_ctx)
1077 const struct cfg80211_chan_def *chandef;
1079 lockdep_assert_held(&local->mtx);
1080 lockdep_assert_held(&local->chanctx_mtx);
1082 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1083 if (WARN_ON(!chandef))
1086 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1087 local->_oper_chandef = *chandef;
1088 ieee80211_hw_config(local, 0);
1093 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1096 struct ieee80211_vif_chanctx_switch *vif_chsw;
1097 struct ieee80211_sub_if_data *sdata;
1098 struct ieee80211_chanctx *ctx, *old_ctx;
1101 lockdep_assert_held(&local->mtx);
1102 lockdep_assert_held(&local->chanctx_mtx);
1104 vif_chsw = kzalloc(sizeof(vif_chsw[0]) * n_vifs, GFP_KERNEL);
1109 list_for_each_entry(ctx, &local->chanctx_list, list) {
1110 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1113 if (WARN_ON(!ctx->replace_ctx)) {
1118 list_for_each_entry(sdata, &ctx->reserved_vifs,
1119 reserved_chanctx_list) {
1120 if (!ieee80211_vif_has_in_place_reservation(
1124 old_ctx = ieee80211_vif_get_chanctx(sdata);
1125 vif_chsw[i].vif = &sdata->vif;
1126 vif_chsw[i].old_ctx = &old_ctx->conf;
1127 vif_chsw[i].new_ctx = &ctx->conf;
1133 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1134 CHANCTX_SWMODE_SWAP_CONTEXTS);
1141 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1143 struct ieee80211_chanctx *ctx;
1146 lockdep_assert_held(&local->mtx);
1147 lockdep_assert_held(&local->chanctx_mtx);
1149 list_for_each_entry(ctx, &local->chanctx_list, list) {
1150 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1153 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1156 ieee80211_del_chanctx(local, ctx->replace_ctx);
1157 err = ieee80211_add_chanctx(local, ctx);
1165 WARN_ON(ieee80211_add_chanctx(local, ctx));
1166 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1167 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1170 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1173 ieee80211_del_chanctx(local, ctx);
1174 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1180 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1182 struct ieee80211_sub_if_data *sdata, *sdata_tmp;
1183 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1184 struct ieee80211_chanctx *new_ctx = NULL;
1185 int i, err, n_assigned, n_reserved, n_ready;
1186 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1188 lockdep_assert_held(&local->mtx);
1189 lockdep_assert_held(&local->chanctx_mtx);
1192 * If there are 2 independent pairs of channel contexts performing
1193 * cross-switch of their vifs this code will still wait until both are
1194 * ready even though it could be possible to switch one before the
1197 * For practical reasons and code simplicity just do a single huge
1202 * Verify if the reservation is still feasible.
1203 * - if it's not then disconnect
1204 * - if it is but not all vifs necessary are ready then defer
1207 list_for_each_entry(ctx, &local->chanctx_list, list) {
1208 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1211 if (WARN_ON(!ctx->replace_ctx)) {
1216 if (!local->use_chanctx)
1225 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
1226 assigned_chanctx_list) {
1228 if (sdata->reserved_chanctx) {
1230 if (sdata->reserved_ready)
1235 if (n_assigned != n_reserved) {
1236 if (n_ready == n_reserved) {
1237 wiphy_info(local->hw.wiphy,
1238 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1246 ctx->conf.radar_enabled = false;
1247 list_for_each_entry(sdata, &ctx->reserved_vifs,
1248 reserved_chanctx_list) {
1249 if (ieee80211_vif_has_in_place_reservation(sdata) &&
1250 !sdata->reserved_ready)
1253 old_ctx = ieee80211_vif_get_chanctx(sdata);
1255 if (old_ctx->replace_state ==
1256 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1264 if (sdata->reserved_radar_required)
1265 ctx->conf.radar_enabled = true;
1269 if (WARN_ON(n_ctx == 0) ||
1270 WARN_ON(n_vifs_switch == 0 &&
1271 n_vifs_assign == 0 &&
1272 n_vifs_ctxless == 0) ||
1273 WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1274 WARN_ON(!new_ctx && !local->use_chanctx)) {
1280 * All necessary vifs are ready. Perform the switch now depending on
1281 * reservations and driver capabilities.
1284 if (local->use_chanctx) {
1285 if (n_vifs_switch > 0) {
1286 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1291 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1292 err = ieee80211_chsw_switch_ctxs(local);
1297 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1303 * Update all structures, values and pointers to point to new channel
1308 list_for_each_entry(ctx, &local->chanctx_list, list) {
1309 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1312 if (WARN_ON(!ctx->replace_ctx)) {
1317 list_for_each_entry(sdata, &ctx->reserved_vifs,
1318 reserved_chanctx_list) {
1321 if (!ieee80211_vif_has_in_place_reservation(sdata))
1324 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
1326 if (sdata->vif.type == NL80211_IFTYPE_AP)
1327 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1330 sdata->radar_required = sdata->reserved_radar_required;
1332 if (sdata->vif.bss_conf.chandef.width !=
1333 sdata->reserved_chandef.width)
1334 changed = BSS_CHANGED_BANDWIDTH;
1336 sdata->vif.bss_conf.chandef = sdata->reserved_chandef;
1338 ieee80211_bss_info_change_notify(sdata,
1341 ieee80211_recalc_txpower(sdata);
1344 ieee80211_recalc_chanctx_chantype(local, ctx);
1345 ieee80211_recalc_smps_chanctx(local, ctx);
1346 ieee80211_recalc_radar_chanctx(local, ctx);
1347 ieee80211_recalc_chanctx_min_def(local, ctx);
1349 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1350 reserved_chanctx_list) {
1351 if (ieee80211_vif_get_chanctx(sdata) != ctx)
1354 list_del(&sdata->reserved_chanctx_list);
1355 list_move(&sdata->assigned_chanctx_list,
1356 &ctx->assigned_vifs);
1357 sdata->reserved_chanctx = NULL;
1359 ieee80211_vif_chanctx_reservation_complete(sdata);
1363 * This context might have been a dependency for an already
1364 * ready re-assign reservation interface that was deferred. Do
1365 * not propagate error to the caller though. The in-place
1366 * reservation for originally requested interface has already
1367 * succeeded at this point.
1369 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1370 reserved_chanctx_list) {
1371 if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1375 if (WARN_ON(sdata->reserved_chanctx != ctx))
1378 if (!sdata->reserved_ready)
1381 if (ieee80211_vif_get_chanctx(sdata))
1382 err = ieee80211_vif_use_reserved_reassign(
1385 err = ieee80211_vif_use_reserved_assign(sdata);
1389 "failed to finalize (re-)assign reservation (err=%d)\n",
1391 ieee80211_vif_unreserve_chanctx(sdata);
1392 cfg80211_stop_iface(local->hw.wiphy,
1400 * Finally free old contexts
1403 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1404 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1407 ctx->replace_ctx->replace_ctx = NULL;
1408 ctx->replace_ctx->replace_state =
1409 IEEE80211_CHANCTX_REPLACE_NONE;
1411 list_del_rcu(&ctx->list);
1412 kfree_rcu(ctx, rcu_head);
1418 list_for_each_entry(ctx, &local->chanctx_list, list) {
1419 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1422 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1423 reserved_chanctx_list) {
1424 ieee80211_vif_unreserve_chanctx(sdata);
1425 ieee80211_vif_chanctx_reservation_complete(sdata);
1432 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1434 struct ieee80211_local *local = sdata->local;
1435 struct ieee80211_chanctx_conf *conf;
1436 struct ieee80211_chanctx *ctx;
1437 bool use_reserved_switch = false;
1439 lockdep_assert_held(&local->chanctx_mtx);
1441 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1442 lockdep_is_held(&local->chanctx_mtx));
1446 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1448 if (sdata->reserved_chanctx) {
1449 if (sdata->reserved_chanctx->replace_state ==
1450 IEEE80211_CHANCTX_REPLACES_OTHER &&
1451 ieee80211_chanctx_num_reserved(local,
1452 sdata->reserved_chanctx) > 1)
1453 use_reserved_switch = true;
1455 ieee80211_vif_unreserve_chanctx(sdata);
1458 ieee80211_assign_vif_chanctx(sdata, NULL);
1459 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1460 ieee80211_free_chanctx(local, ctx);
1462 /* Unreserving may ready an in-place reservation. */
1463 if (use_reserved_switch)
1464 ieee80211_vif_use_reserved_switch(local);
1467 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
1468 const struct cfg80211_chan_def *chandef,
1469 enum ieee80211_chanctx_mode mode)
1471 struct ieee80211_local *local = sdata->local;
1472 struct ieee80211_chanctx *ctx;
1473 u8 radar_detect_width = 0;
1476 lockdep_assert_held(&local->mtx);
1478 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1480 mutex_lock(&local->chanctx_mtx);
1482 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1484 sdata->wdev.iftype);
1488 radar_detect_width = BIT(chandef->width);
1490 sdata->radar_required = ret;
1492 ret = ieee80211_check_combinations(sdata, chandef, mode,
1493 radar_detect_width);
1497 __ieee80211_vif_release_channel(sdata);
1499 ctx = ieee80211_find_chanctx(local, chandef, mode);
1501 ctx = ieee80211_new_chanctx(local, chandef, mode);
1507 sdata->vif.bss_conf.chandef = *chandef;
1509 ret = ieee80211_assign_vif_chanctx(sdata, ctx);
1511 /* if assign fails refcount stays the same */
1512 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1513 ieee80211_free_chanctx(local, ctx);
1517 ieee80211_recalc_smps_chanctx(local, ctx);
1518 ieee80211_recalc_radar_chanctx(local, ctx);
1520 mutex_unlock(&local->chanctx_mtx);
1524 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1526 struct ieee80211_local *local = sdata->local;
1527 struct ieee80211_chanctx *new_ctx;
1528 struct ieee80211_chanctx *old_ctx;
1531 lockdep_assert_held(&local->mtx);
1532 lockdep_assert_held(&local->chanctx_mtx);
1534 new_ctx = sdata->reserved_chanctx;
1535 old_ctx = ieee80211_vif_get_chanctx(sdata);
1537 if (WARN_ON(!new_ctx))
1540 if (WARN_ON(new_ctx->replace_state ==
1541 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1544 if (WARN_ON(sdata->reserved_ready))
1547 sdata->reserved_ready = true;
1549 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1551 err = ieee80211_vif_use_reserved_reassign(sdata);
1553 err = ieee80211_vif_use_reserved_assign(sdata);
1560 * In-place reservation may need to be finalized now either if:
1561 * a) sdata is taking part in the swapping itself and is the last one
1562 * b) sdata has switched with a re-assign reservation to an existing
1563 * context readying in-place switching of old_ctx
1565 * In case of (b) do not propagate the error up because the requested
1566 * sdata already switched successfully. Just spill an extra warning.
1567 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1568 * interfaces upon failure.
1571 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1572 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1573 err = ieee80211_vif_use_reserved_switch(local);
1574 if (err && err != -EAGAIN) {
1575 if (new_ctx->replace_state ==
1576 IEEE80211_CHANCTX_REPLACES_OTHER)
1579 wiphy_info(local->hw.wiphy,
1580 "depending in-place reservation failed (err=%d)\n",
1588 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1589 const struct cfg80211_chan_def *chandef,
1592 struct ieee80211_local *local = sdata->local;
1593 struct ieee80211_chanctx_conf *conf;
1594 struct ieee80211_chanctx *ctx;
1595 const struct cfg80211_chan_def *compat;
1598 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1599 IEEE80211_CHAN_DISABLED))
1602 mutex_lock(&local->chanctx_mtx);
1603 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1608 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1609 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1614 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1615 lockdep_is_held(&local->chanctx_mtx));
1621 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1623 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1629 switch (ctx->replace_state) {
1630 case IEEE80211_CHANCTX_REPLACE_NONE:
1631 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1636 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1637 /* TODO: Perhaps the bandwith change could be treated as a
1638 * reservation itself? */
1641 case IEEE80211_CHANCTX_REPLACES_OTHER:
1642 /* channel context that is going to replace another channel
1643 * context doesn't really exist and shouldn't be assigned
1649 sdata->vif.bss_conf.chandef = *chandef;
1651 ieee80211_recalc_chanctx_chantype(local, ctx);
1653 *changed |= BSS_CHANGED_BANDWIDTH;
1656 mutex_unlock(&local->chanctx_mtx);
1660 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1662 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1664 lockdep_assert_held(&sdata->local->mtx);
1666 mutex_lock(&sdata->local->chanctx_mtx);
1667 __ieee80211_vif_release_channel(sdata);
1668 mutex_unlock(&sdata->local->chanctx_mtx);
1671 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1673 struct ieee80211_local *local = sdata->local;
1674 struct ieee80211_sub_if_data *ap;
1675 struct ieee80211_chanctx_conf *conf;
1677 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1680 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1682 mutex_lock(&local->chanctx_mtx);
1684 conf = rcu_dereference_protected(ap->vif.chanctx_conf,
1685 lockdep_is_held(&local->chanctx_mtx));
1686 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
1687 mutex_unlock(&local->chanctx_mtx);
1690 void ieee80211_iter_chan_contexts_atomic(
1691 struct ieee80211_hw *hw,
1692 void (*iter)(struct ieee80211_hw *hw,
1693 struct ieee80211_chanctx_conf *chanctx_conf,
1697 struct ieee80211_local *local = hw_to_local(hw);
1698 struct ieee80211_chanctx *ctx;
1701 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
1702 if (ctx->driver_present)
1703 iter(hw, &ctx->conf, iter_data);
1706 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);