[mirror_ubuntu-zesty-kernel.git] / net / mac80211 / chan.c

/*
 * mac80211 - channel management
 */

#include <linux/nl80211.h>
#include <linux/export.h>
#include <net/cfg80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"

static void ieee80211_change_chandef(struct ieee80211_local *local,
				     struct ieee80211_chanctx *ctx,
				     const struct cfg80211_chan_def *chandef)
{
	if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
		return;

	WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));

	ctx->conf.def = *chandef;
	drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);

	if (!local->use_chanctx) {
		local->_oper_channel_type = cfg80211_get_chandef_type(chandef);
		ieee80211_hw_config(local, 0);
	}
}

static struct ieee80211_chanctx *
ieee80211_find_chanctx(struct ieee80211_local *local,
		       const struct cfg80211_chan_def *chandef,
		       enum ieee80211_chanctx_mode mode)
{
	struct ieee80211_chanctx *ctx;

	lockdep_assert_held(&local->chanctx_mtx);

	if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
		return NULL;

	list_for_each_entry(ctx, &local->chanctx_list, list) {
		const struct cfg80211_chan_def *compat;

		if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
			continue;

		compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
		if (!compat)
			continue;

		ieee80211_change_chandef(local, ctx, compat);

		return ctx;
	}

	return NULL;
}

static struct ieee80211_chanctx *
ieee80211_new_chanctx(struct ieee80211_local *local,
		      const struct cfg80211_chan_def *chandef,
		      enum ieee80211_chanctx_mode mode)
{
	struct ieee80211_chanctx *ctx;
	int err;

	lockdep_assert_held(&local->chanctx_mtx);

	ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
	if (!ctx)
		return ERR_PTR(-ENOMEM);

	ctx->conf.def = *chandef;
	ctx->conf.rx_chains_static = 1;
	ctx->conf.rx_chains_dynamic = 1;
	ctx->mode = mode;

	if (!local->use_chanctx) {
		local->_oper_channel_type =
			cfg80211_get_chandef_type(chandef);
		local->_oper_channel = chandef->chan;
		ieee80211_hw_config(local, 0);
	} else {
		err = drv_add_chanctx(local, ctx);
		if (err) {
			kfree(ctx);
			return ERR_PTR(err);
		}
	}

	list_add_rcu(&ctx->list, &local->chanctx_list);

	return ctx;
}

static void ieee80211_free_chanctx(struct ieee80211_local *local,
				   struct ieee80211_chanctx *ctx)
{
	lockdep_assert_held(&local->chanctx_mtx);

	WARN_ON_ONCE(ctx->refcount != 0);

	if (!local->use_chanctx) {
		local->_oper_channel_type = NL80211_CHAN_NO_HT;
		ieee80211_hw_config(local, 0);
	} else {
		drv_remove_chanctx(local, ctx);
	}

	list_del_rcu(&ctx->list);
	kfree_rcu(ctx, rcu_head);
}

static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
					struct ieee80211_chanctx *ctx)
{
	struct ieee80211_local *local = sdata->local;
	int ret;

	lockdep_assert_held(&local->chanctx_mtx);

	ret = drv_assign_vif_chanctx(local, sdata, ctx);
	if (ret)
		return ret;

	rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
	ctx->refcount++;

	ieee80211_recalc_txpower(sdata);

	return 0;
}

static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
					      struct ieee80211_chanctx *ctx)
{
	struct ieee80211_chanctx_conf *conf = &ctx->conf;
	struct ieee80211_sub_if_data *sdata;
	const struct cfg80211_chan_def *compat = NULL;

	lockdep_assert_held(&local->chanctx_mtx);

	rcu_read_lock();
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {

		if (!ieee80211_sdata_running(sdata))
			continue;
		if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
			continue;

		if (!compat)
			compat = &sdata->vif.bss_conf.chandef;

		compat = cfg80211_chandef_compatible(
				&sdata->vif.bss_conf.chandef, compat);
		if (!compat)
			break;
	}
	rcu_read_unlock();

	if (WARN_ON_ONCE(!compat))
		return;

	ieee80211_change_chandef(local, ctx, compat);
}

static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
					   struct ieee80211_chanctx *ctx)
{
	struct ieee80211_local *local = sdata->local;

	lockdep_assert_held(&local->chanctx_mtx);

	ctx->refcount--;
	rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);

	drv_unassign_vif_chanctx(local, sdata, ctx);

	if (ctx->refcount > 0) {
		ieee80211_recalc_chanctx_chantype(sdata->local, ctx);
		ieee80211_recalc_smps_chanctx(local, ctx);
	}
}

static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_chanctx_conf *conf;
	struct ieee80211_chanctx *ctx;

	lockdep_assert_held(&local->chanctx_mtx);

	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
					 lockdep_is_held(&local->chanctx_mtx));
	if (!conf)
		return;

	ctx = container_of(conf, struct ieee80211_chanctx, conf);

	ieee80211_unassign_vif_chanctx(sdata, ctx);
	if (ctx->refcount == 0)
		ieee80211_free_chanctx(local, ctx);
}

void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
				   struct ieee80211_chanctx *chanctx)
{
	struct ieee80211_sub_if_data *sdata;
	u8 rx_chains_static, rx_chains_dynamic;

	lockdep_assert_held(&local->chanctx_mtx);

	rx_chains_static = 1;
	rx_chains_dynamic = 1;

	rcu_read_lock();
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		u8 needed_static, needed_dynamic;

		if (!ieee80211_sdata_running(sdata))
			continue;

		if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
						&chanctx->conf)
			continue;

		switch (sdata->vif.type) {
		case NL80211_IFTYPE_P2P_DEVICE:
			continue;
		case NL80211_IFTYPE_STATION:
			if (!sdata->u.mgd.associated)
				continue;
			break;
		case NL80211_IFTYPE_AP_VLAN:
			continue;
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_WDS:
		case NL80211_IFTYPE_MESH_POINT:
			break;
		default:
			WARN_ON_ONCE(1);
		}

		switch (sdata->smps_mode) {
		default:
			WARN_ONCE(1, "Invalid SMPS mode %d\n",
				  sdata->smps_mode);
			/* fall through */
		case IEEE80211_SMPS_OFF:
			needed_static = sdata->needed_rx_chains;
			needed_dynamic = sdata->needed_rx_chains;
			break;
		case IEEE80211_SMPS_DYNAMIC:
			needed_static = 1;
			needed_dynamic = sdata->needed_rx_chains;
			break;
		case IEEE80211_SMPS_STATIC:
			needed_static = 1;
			needed_dynamic = 1;
			break;
		}

		rx_chains_static = max(rx_chains_static, needed_static);
		rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
	}
	rcu_read_unlock();

	if (!local->use_chanctx) {
		if (rx_chains_static > 1)
			local->smps_mode = IEEE80211_SMPS_OFF;
		else if (rx_chains_dynamic > 1)
			local->smps_mode = IEEE80211_SMPS_DYNAMIC;
		else
			local->smps_mode = IEEE80211_SMPS_STATIC;
		ieee80211_hw_config(local, 0);
	}

	if (rx_chains_static == chanctx->conf.rx_chains_static &&
	    rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
		return;

	chanctx->conf.rx_chains_static = rx_chains_static;
	chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
	drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
}

int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
			      const struct cfg80211_chan_def *chandef,
			      enum ieee80211_chanctx_mode mode)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_chanctx *ctx;
	int ret;

	WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));

	mutex_lock(&local->chanctx_mtx);
	__ieee80211_vif_release_channel(sdata);

	ctx = ieee80211_find_chanctx(local, chandef, mode);
	if (!ctx)
		ctx = ieee80211_new_chanctx(local, chandef, mode);
	if (IS_ERR(ctx)) {
		ret = PTR_ERR(ctx);
		goto out;
	}

	sdata->vif.bss_conf.chandef = *chandef;

	ret = ieee80211_assign_vif_chanctx(sdata, ctx);
	if (ret) {
		/* if assign fails refcount stays the same */
		if (ctx->refcount == 0)
			ieee80211_free_chanctx(local, ctx);
		goto out;
	}

	ieee80211_recalc_smps_chanctx(local, ctx);
 out:
	mutex_unlock(&local->chanctx_mtx);
	return ret;
}

void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
{
	WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));

	mutex_lock(&sdata->local->chanctx_mtx);
	__ieee80211_vif_release_channel(sdata);
	mutex_unlock(&sdata->local->chanctx_mtx);
}

void ieee80211_iter_chan_contexts_atomic(
	struct ieee80211_hw *hw,
	void (*iter)(struct ieee80211_hw *hw,
		     struct ieee80211_chanctx_conf *chanctx_conf,
		     void *data),
	void *iter_data)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_chanctx *ctx;

	rcu_read_lock();
	list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
		iter(hw, &ctx->conf, iter_data);
	rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
Commit	Line	Data
f444de05 JB	1	/*
	2	* mac80211 - channel management
	3	*/
	4
0aaffa9b	5	#include <linux/nl80211.h>
3448c005	6	#include <linux/export.h>
3117bbdb	7	#include <net/cfg80211.h>
f444de05	8	#include "ieee80211_i.h"
35f2fce9	9	#include "driver-ops.h"
f444de05	10
4bf88530 JB	11	static void ieee80211_change_chandef(struct ieee80211_local *local,
	12	struct ieee80211_chanctx *ctx,
	13	const struct cfg80211_chan_def *chandef)
23a85b45	14	{
4bf88530	15	if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
e89a96f5	16	return;
0aaffa9b	17
4bf88530 JB	18	WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
	19
	20	ctx->conf.def = *chandef;
	21	drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
55de908a JB	22
55de908a JB	23	if (!local->use_chanctx) {
4bf88530	24	local->_oper_channel_type = cfg80211_get_chandef_type(chandef);
55de908a JB	25	ieee80211_hw_config(local, 0);
55de908a JB	26	}
0aaffa9b	27	}
d01a1e65 MK	28
	29	static struct ieee80211_chanctx *
	30	ieee80211_find_chanctx(struct ieee80211_local *local,
4bf88530	31	const struct cfg80211_chan_def *chandef,
d01a1e65 MK	32	enum ieee80211_chanctx_mode mode)
	33	{
	34	struct ieee80211_chanctx *ctx;
	35
	36	lockdep_assert_held(&local->chanctx_mtx);
	37
	38	if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
	39	return NULL;
d01a1e65 MK	40
d01a1e65 MK	41	list_for_each_entry(ctx, &local->chanctx_list, list) {
4bf88530	42	const struct cfg80211_chan_def *compat;
e89a96f5	43
d01a1e65 MK	44	if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
d01a1e65 MK	45	continue;
4bf88530 JB	46
	47	compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
	48	if (!compat)
d01a1e65 MK	49	continue;
d01a1e65 MK	50
4bf88530	51	ieee80211_change_chandef(local, ctx, compat);
e89a96f5	52
d01a1e65 MK	53	return ctx;
	54	}
	55
	56	return NULL;
	57	}
	58
	59	static struct ieee80211_chanctx *
	60	ieee80211_new_chanctx(struct ieee80211_local *local,
4bf88530	61	const struct cfg80211_chan_def *chandef,
d01a1e65 MK	62	enum ieee80211_chanctx_mode mode)
	63	{
	64	struct ieee80211_chanctx *ctx;
35f2fce9	65	int err;
d01a1e65 MK	66
	67	lockdep_assert_held(&local->chanctx_mtx);
	68
	69	ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
	70	if (!ctx)
	71	return ERR_PTR(-ENOMEM);
	72
4bf88530	73	ctx->conf.def = *chandef;
04ecd257 JB	74	ctx->conf.rx_chains_static = 1;
04ecd257 JB	75	ctx->conf.rx_chains_dynamic = 1;
d01a1e65 MK	76	ctx->mode = mode;
d01a1e65 MK	77
55de908a	78	if (!local->use_chanctx) {
4bf88530 JB	79	local->_oper_channel_type =
	80	cfg80211_get_chandef_type(chandef);
	81	local->_oper_channel = chandef->chan;
55de908a JB	82	ieee80211_hw_config(local, 0);
	83	} else {
	84	err = drv_add_chanctx(local, ctx);
	85	if (err) {
	86	kfree(ctx);
	87	return ERR_PTR(err);
	88	}
35f2fce9 MK	89	}
35f2fce9 MK	90
3448c005	91	list_add_rcu(&ctx->list, &local->chanctx_list);
d01a1e65 MK	92
	93	return ctx;
	94	}
	95
	96	static void ieee80211_free_chanctx(struct ieee80211_local *local,
	97	struct ieee80211_chanctx *ctx)
	98	{
	99	lockdep_assert_held(&local->chanctx_mtx);
	100
	101	WARN_ON_ONCE(ctx->refcount != 0);
	102
55de908a JB	103	if (!local->use_chanctx) {
	104	local->_oper_channel_type = NL80211_CHAN_NO_HT;
	105	ieee80211_hw_config(local, 0);
	106	} else {
	107	drv_remove_chanctx(local, ctx);
	108	}
35f2fce9	109
3448c005	110	list_del_rcu(&ctx->list);
d01a1e65 MK	111	kfree_rcu(ctx, rcu_head);
	112	}
	113
	114	static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
	115	struct ieee80211_chanctx *ctx)
	116	{
35f2fce9 MK	117	struct ieee80211_local *local = sdata->local;
35f2fce9 MK	118	int ret;
d01a1e65 MK	119
	120	lockdep_assert_held(&local->chanctx_mtx);
	121
35f2fce9 MK	122	ret = drv_assign_vif_chanctx(local, sdata, ctx);
	123	if (ret)
	124	return ret;
	125
d01a1e65 MK	126	rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
	127	ctx->refcount++;
	128
1ea6f9c0 JB	129	ieee80211_recalc_txpower(sdata);
1ea6f9c0 JB	130
d01a1e65 MK	131	return 0;
	132	}
	133
4bf88530 JB	134	static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
4bf88530 JB	135	struct ieee80211_chanctx *ctx)
e89a96f5 MK	136	{
	137	struct ieee80211_chanctx_conf *conf = &ctx->conf;
	138	struct ieee80211_sub_if_data *sdata;
4bf88530	139	const struct cfg80211_chan_def *compat = NULL;
e89a96f5 MK	140
	141	lockdep_assert_held(&local->chanctx_mtx);
	142
	143	rcu_read_lock();
	144	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4bf88530	145
e89a96f5 MK	146	if (!ieee80211_sdata_running(sdata))
	147	continue;
	148	if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
	149	continue;
	150
4bf88530 JB	151	if (!compat)
	152	compat = &sdata->vif.bss_conf.chandef;
	153
	154	compat = cfg80211_chandef_compatible(
	155	&sdata->vif.bss_conf.chandef, compat);
	156	if (!compat)
	157	break;
e89a96f5 MK	158	}
	159	rcu_read_unlock();
	160
4bf88530 JB	161	if (WARN_ON_ONCE(!compat))
4bf88530 JB	162	return;
e89a96f5	163
4bf88530	164	ieee80211_change_chandef(local, ctx, compat);
e89a96f5 MK	165	}
e89a96f5 MK	166
d01a1e65 MK	167	static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
	168	struct ieee80211_chanctx *ctx)
	169	{
35f2fce9	170	struct ieee80211_local *local = sdata->local;
d01a1e65 MK	171
	172	lockdep_assert_held(&local->chanctx_mtx);
	173
	174	ctx->refcount--;
	175	rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
35f2fce9 MK	176
35f2fce9 MK	177	drv_unassign_vif_chanctx(local, sdata, ctx);
e89a96f5	178
04ecd257	179	if (ctx->refcount > 0) {
e89a96f5	180	ieee80211_recalc_chanctx_chantype(sdata->local, ctx);
04ecd257 JB	181	ieee80211_recalc_smps_chanctx(local, ctx);
04ecd257 JB	182	}
d01a1e65 MK	183	}
	184
	185	static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
	186	{
	187	struct ieee80211_local *local = sdata->local;
	188	struct ieee80211_chanctx_conf *conf;
	189	struct ieee80211_chanctx *ctx;
	190
	191	lockdep_assert_held(&local->chanctx_mtx);
	192
	193	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
	194	lockdep_is_held(&local->chanctx_mtx));
	195	if (!conf)
	196	return;
	197
	198	ctx = container_of(conf, struct ieee80211_chanctx, conf);
	199
	200	ieee80211_unassign_vif_chanctx(sdata, ctx);
	201	if (ctx->refcount == 0)
	202	ieee80211_free_chanctx(local, ctx);
	203	}
	204
04ecd257 JB	205	void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
	206	struct ieee80211_chanctx *chanctx)
	207	{
	208	struct ieee80211_sub_if_data *sdata;
	209	u8 rx_chains_static, rx_chains_dynamic;
	210
	211	lockdep_assert_held(&local->chanctx_mtx);
	212
	213	rx_chains_static = 1;
	214	rx_chains_dynamic = 1;
	215
	216	rcu_read_lock();
	217	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
	218	u8 needed_static, needed_dynamic;
	219
	220	if (!ieee80211_sdata_running(sdata))
	221	continue;
	222
	223	if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
	224	&chanctx->conf)
	225	continue;
	226
	227	switch (sdata->vif.type) {
	228	case NL80211_IFTYPE_P2P_DEVICE:
	229	continue;
	230	case NL80211_IFTYPE_STATION:
	231	if (!sdata->u.mgd.associated)
	232	continue;
	233	break;
	234	case NL80211_IFTYPE_AP_VLAN:
	235	continue;
	236	case NL80211_IFTYPE_AP:
	237	case NL80211_IFTYPE_ADHOC:
	238	case NL80211_IFTYPE_WDS:
	239	case NL80211_IFTYPE_MESH_POINT:
	240	break;
	241	default:
	242	WARN_ON_ONCE(1);
	243	}
	244
	245	switch (sdata->smps_mode) {
	246	default:
	247	WARN_ONCE(1, "Invalid SMPS mode %d\n",
	248	sdata->smps_mode);
	249	/* fall through */
	250	case IEEE80211_SMPS_OFF:
	251	needed_static = sdata->needed_rx_chains;
	252	needed_dynamic = sdata->needed_rx_chains;
	253	break;
	254	case IEEE80211_SMPS_DYNAMIC:
	255	needed_static = 1;
	256	needed_dynamic = sdata->needed_rx_chains;
	257	break;
	258	case IEEE80211_SMPS_STATIC:
	259	needed_static = 1;
	260	needed_dynamic = 1;
	261	break;
	262	}
	263
	264	rx_chains_static = max(rx_chains_static, needed_static);
	265	rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
	266	}
	267	rcu_read_unlock();
	268
269	if (!local->use_chanctx) {
270	if (rx_chains_static > 1)
271	local->smps_mode = IEEE80211_SMPS_OFF;
272	else if (rx_chains_dynamic > 1)
273	local->smps_mode = IEEE80211_SMPS_DYNAMIC;
274	else
275	local->smps_mode = IEEE80211_SMPS_STATIC;
276	ieee80211_hw_config(local, 0);
277	}
278
279	if (rx_chains_static == chanctx->conf.rx_chains_static &&
280	rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
281	return;
282
283	chanctx->conf.rx_chains_static = rx_chains_static;
284	chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
285	drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
286	}
287
d01a1e65	288	int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
4bf88530	289	const struct cfg80211_chan_def *chandef,
d01a1e65 MK	290	enum ieee80211_chanctx_mode mode)
	291	{
	292	struct ieee80211_local *local = sdata->local;
	293	struct ieee80211_chanctx *ctx;
	294	int ret;
	295
55de908a JB	296	WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
55de908a JB	297
d01a1e65 MK	298	mutex_lock(&local->chanctx_mtx);
	299	__ieee80211_vif_release_channel(sdata);
	300
4bf88530	301	ctx = ieee80211_find_chanctx(local, chandef, mode);
d01a1e65	302	if (!ctx)
4bf88530	303	ctx = ieee80211_new_chanctx(local, chandef, mode);
d01a1e65 MK	304	if (IS_ERR(ctx)) {
	305	ret = PTR_ERR(ctx);
	306	goto out;
	307	}
	308
4bf88530	309	sdata->vif.bss_conf.chandef = *chandef;
55de908a	310
d01a1e65 MK	311	ret = ieee80211_assign_vif_chanctx(sdata, ctx);
	312	if (ret) {
	313	/* if assign fails refcount stays the same */
	314	if (ctx->refcount == 0)
	315	ieee80211_free_chanctx(local, ctx);
	316	goto out;
	317	}
	318
04ecd257	319	ieee80211_recalc_smps_chanctx(local, ctx);
d01a1e65 MK	320	out:
	321	mutex_unlock(&local->chanctx_mtx);
	322	return ret;
	323	}
	324
	325	void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
	326	{
55de908a JB	327	WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
55de908a JB	328
d01a1e65 MK	329	mutex_lock(&sdata->local->chanctx_mtx);
	330	__ieee80211_vif_release_channel(sdata);
	331	mutex_unlock(&sdata->local->chanctx_mtx);
	332	}
3448c005 JB	333
	334	void ieee80211_iter_chan_contexts_atomic(
	335	struct ieee80211_hw *hw,
	336	void (iter)(struct ieee80211_hw hw,
	337	struct ieee80211_chanctx_conf *chanctx_conf,
	338	void *data),
	339	void *iter_data)
	340	{
	341	struct ieee80211_local *local = hw_to_local(hw);
	342	struct ieee80211_chanctx *ctx;
	343
	344	rcu_read_lock();
	345	list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
	346	iter(hw, &ctx->conf, iter_data);
	347	rcu_read_unlock();
	348	}
	349	EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);