[deliverable/linux.git] / net / mac80211 / chan.c

/*
 * mac80211 - channel management
 */

#include <linux/nl80211.h>
#include <linux/export.h>
#include <linux/rtnetlink.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);

	if (sdata->vif.type == NL80211_IFTYPE_AP) {
		struct ieee80211_sub_if_data *vlan;

		/* for the VLAN list */
		ASSERT_RTNL();
		list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
			rcu_assign_pointer(vlan->vif.chanctx_conf, NULL);
	}

	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;
	}

	if (sdata->vif.type == NL80211_IFTYPE_AP) {
		struct ieee80211_sub_if_data *vlan;

		/* for the VLAN list */
		ASSERT_RTNL();
		list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
			rcu_assign_pointer(vlan->vif.chanctx_conf, &ctx->conf);
	}

	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_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_sub_if_data *ap;
	struct ieee80211_chanctx_conf *conf;

	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
		return;

	ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);

	mutex_lock(&local->chanctx_mtx);

	conf = rcu_dereference_protected(ap->vif.chanctx_conf,
					 lockdep_is_held(&local->chanctx_mtx));
	rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
	mutex_unlock(&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>
4d76d21b	7	#include <linux/rtnetlink.h>
3117bbdb	8	#include <net/cfg80211.h>
f444de05	9	#include "ieee80211_i.h"
35f2fce9	10	#include "driver-ops.h"
f444de05	11
4bf88530 JB	12	static void ieee80211_change_chandef(struct ieee80211_local *local,
	13	struct ieee80211_chanctx *ctx,
	14	const struct cfg80211_chan_def *chandef)
23a85b45	15	{
4bf88530	16	if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
e89a96f5	17	return;
0aaffa9b	18
4bf88530 JB	19	WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
	20
	21	ctx->conf.def = *chandef;
	22	drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
55de908a JB	23
55de908a JB	24	if (!local->use_chanctx) {
4bf88530	25	local->_oper_channel_type = cfg80211_get_chandef_type(chandef);
55de908a JB	26	ieee80211_hw_config(local, 0);
55de908a JB	27	}
0aaffa9b	28	}
d01a1e65 MK	29
	30	static struct ieee80211_chanctx *
	31	ieee80211_find_chanctx(struct ieee80211_local *local,
4bf88530	32	const struct cfg80211_chan_def *chandef,
d01a1e65 MK	33	enum ieee80211_chanctx_mode mode)
	34	{
	35	struct ieee80211_chanctx *ctx;
	36
	37	lockdep_assert_held(&local->chanctx_mtx);
	38
	39	if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
	40	return NULL;
d01a1e65 MK	41
d01a1e65 MK	42	list_for_each_entry(ctx, &local->chanctx_list, list) {
4bf88530	43	const struct cfg80211_chan_def *compat;
e89a96f5	44
d01a1e65 MK	45	if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
d01a1e65 MK	46	continue;
4bf88530 JB	47
	48	compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
	49	if (!compat)
d01a1e65 MK	50	continue;
d01a1e65 MK	51
4bf88530	52	ieee80211_change_chandef(local, ctx, compat);
e89a96f5	53
d01a1e65 MK	54	return ctx;
	55	}
	56
	57	return NULL;
	58	}
	59
	60	static struct ieee80211_chanctx *
	61	ieee80211_new_chanctx(struct ieee80211_local *local,
4bf88530	62	const struct cfg80211_chan_def *chandef,
d01a1e65 MK	63	enum ieee80211_chanctx_mode mode)
	64	{
	65	struct ieee80211_chanctx *ctx;
35f2fce9	66	int err;
d01a1e65 MK	67
	68	lockdep_assert_held(&local->chanctx_mtx);
	69
	70	ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
	71	if (!ctx)
	72	return ERR_PTR(-ENOMEM);
	73
4bf88530	74	ctx->conf.def = *chandef;
04ecd257 JB	75	ctx->conf.rx_chains_static = 1;
04ecd257 JB	76	ctx->conf.rx_chains_dynamic = 1;
d01a1e65 MK	77	ctx->mode = mode;
d01a1e65 MK	78
55de908a	79	if (!local->use_chanctx) {
4bf88530 JB	80	local->_oper_channel_type =
	81	cfg80211_get_chandef_type(chandef);
	82	local->_oper_channel = chandef->chan;
55de908a JB	83	ieee80211_hw_config(local, 0);
	84	} else {
	85	err = drv_add_chanctx(local, ctx);
	86	if (err) {
	87	kfree(ctx);
	88	return ERR_PTR(err);
	89	}
35f2fce9 MK	90	}
35f2fce9 MK	91
3448c005	92	list_add_rcu(&ctx->list, &local->chanctx_list);
d01a1e65 MK	93
	94	return ctx;
	95	}
	96
	97	static void ieee80211_free_chanctx(struct ieee80211_local *local,
	98	struct ieee80211_chanctx *ctx)
	99	{
	100	lockdep_assert_held(&local->chanctx_mtx);
	101
	102	WARN_ON_ONCE(ctx->refcount != 0);
	103
55de908a JB	104	if (!local->use_chanctx) {
	105	local->_oper_channel_type = NL80211_CHAN_NO_HT;
	106	ieee80211_hw_config(local, 0);
	107	} else {
	108	drv_remove_chanctx(local, ctx);
	109	}
35f2fce9	110
3448c005	111	list_del_rcu(&ctx->list);
d01a1e65 MK	112	kfree_rcu(ctx, rcu_head);
	113	}
	114
	115	static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
	116	struct ieee80211_chanctx *ctx)
	117	{
35f2fce9 MK	118	struct ieee80211_local *local = sdata->local;
35f2fce9 MK	119	int ret;
d01a1e65 MK	120
	121	lockdep_assert_held(&local->chanctx_mtx);
	122
35f2fce9 MK	123	ret = drv_assign_vif_chanctx(local, sdata, ctx);
	124	if (ret)
	125	return ret;
	126
d01a1e65 MK	127	rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
	128	ctx->refcount++;
	129
1ea6f9c0 JB	130	ieee80211_recalc_txpower(sdata);
1ea6f9c0 JB	131
d01a1e65 MK	132	return 0;
	133	}
	134
4bf88530 JB	135	static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
4bf88530 JB	136	struct ieee80211_chanctx *ctx)
e89a96f5 MK	137	{
	138	struct ieee80211_chanctx_conf *conf = &ctx->conf;
	139	struct ieee80211_sub_if_data *sdata;
4bf88530	140	const struct cfg80211_chan_def *compat = NULL;
e89a96f5 MK	141
	142	lockdep_assert_held(&local->chanctx_mtx);
	143
	144	rcu_read_lock();
	145	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4bf88530	146
e89a96f5 MK	147	if (!ieee80211_sdata_running(sdata))
	148	continue;
	149	if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
	150	continue;
	151
4bf88530 JB	152	if (!compat)
	153	compat = &sdata->vif.bss_conf.chandef;
	154
	155	compat = cfg80211_chandef_compatible(
	156	&sdata->vif.bss_conf.chandef, compat);
	157	if (!compat)
	158	break;
e89a96f5 MK	159	}
	160	rcu_read_unlock();
	161
4bf88530 JB	162	if (WARN_ON_ONCE(!compat))
4bf88530 JB	163	return;
e89a96f5	164
4bf88530	165	ieee80211_change_chandef(local, ctx, compat);
e89a96f5 MK	166	}
e89a96f5 MK	167
d01a1e65 MK	168	static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
	169	struct ieee80211_chanctx *ctx)
	170	{
35f2fce9	171	struct ieee80211_local *local = sdata->local;
d01a1e65 MK	172
	173	lockdep_assert_held(&local->chanctx_mtx);
	174
	175	ctx->refcount--;
	176	rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
35f2fce9 MK	177
35f2fce9 MK	178	drv_unassign_vif_chanctx(local, sdata, ctx);
e89a96f5	179
04ecd257	180	if (ctx->refcount > 0) {
e89a96f5	181	ieee80211_recalc_chanctx_chantype(sdata->local, ctx);
04ecd257 JB	182	ieee80211_recalc_smps_chanctx(local, ctx);
04ecd257 JB	183	}
d01a1e65 MK	184	}
	185
	186	static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
	187	{
	188	struct ieee80211_local *local = sdata->local;
	189	struct ieee80211_chanctx_conf *conf;
	190	struct ieee80211_chanctx *ctx;
	191
	192	lockdep_assert_held(&local->chanctx_mtx);
	193
	194	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
	195	lockdep_is_held(&local->chanctx_mtx));
	196	if (!conf)
	197	return;
	198
	199	ctx = container_of(conf, struct ieee80211_chanctx, conf);
	200
4d76d21b JB	201	if (sdata->vif.type == NL80211_IFTYPE_AP) {
	202	struct ieee80211_sub_if_data *vlan;
	203
	204	/* for the VLAN list */
	205	ASSERT_RTNL();
	206	list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
	207	rcu_assign_pointer(vlan->vif.chanctx_conf, NULL);
	208	}
	209
d01a1e65 MK	210	ieee80211_unassign_vif_chanctx(sdata, ctx);
	211	if (ctx->refcount == 0)
	212	ieee80211_free_chanctx(local, ctx);
	213	}
	214
04ecd257 JB	215	void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
	216	struct ieee80211_chanctx *chanctx)
	217	{
	218	struct ieee80211_sub_if_data *sdata;
	219	u8 rx_chains_static, rx_chains_dynamic;
	220
	221	lockdep_assert_held(&local->chanctx_mtx);
	222
	223	rx_chains_static = 1;
	224	rx_chains_dynamic = 1;
	225
	226	rcu_read_lock();
	227	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
	228	u8 needed_static, needed_dynamic;
	229
	230	if (!ieee80211_sdata_running(sdata))
	231	continue;
	232
	233	if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
	234	&chanctx->conf)
	235	continue;
	236
	237	switch (sdata->vif.type) {
	238	case NL80211_IFTYPE_P2P_DEVICE:
	239	continue;
	240	case NL80211_IFTYPE_STATION:
	241	if (!sdata->u.mgd.associated)
	242	continue;
	243	break;
	244	case NL80211_IFTYPE_AP_VLAN:
	245	continue;
	246	case NL80211_IFTYPE_AP:
	247	case NL80211_IFTYPE_ADHOC:
	248	case NL80211_IFTYPE_WDS:
	249	case NL80211_IFTYPE_MESH_POINT:
	250	break;
	251	default:
	252	WARN_ON_ONCE(1);
	253	}
	254
	255	switch (sdata->smps_mode) {
	256	default:
	257	WARN_ONCE(1, "Invalid SMPS mode %d\n",
	258	sdata->smps_mode);
	259	/* fall through */
	260	case IEEE80211_SMPS_OFF:
	261	needed_static = sdata->needed_rx_chains;
	262	needed_dynamic = sdata->needed_rx_chains;
	263	break;
	264	case IEEE80211_SMPS_DYNAMIC:
	265	needed_static = 1;
	266	needed_dynamic = sdata->needed_rx_chains;
	267	break;
	268	case IEEE80211_SMPS_STATIC:
	269	needed_static = 1;
	270	needed_dynamic = 1;
	271	break;
	272	}
	273
	274	rx_chains_static = max(rx_chains_static, needed_static);
	275	rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
	276	}
	277	rcu_read_unlock();
	278
279	if (!local->use_chanctx) {
280	if (rx_chains_static > 1)
281	local->smps_mode = IEEE80211_SMPS_OFF;
282	else if (rx_chains_dynamic > 1)
283	local->smps_mode = IEEE80211_SMPS_DYNAMIC;
284	else
285	local->smps_mode = IEEE80211_SMPS_STATIC;
286	ieee80211_hw_config(local, 0);
287	}
288
289	if (rx_chains_static == chanctx->conf.rx_chains_static &&
290	rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
291	return;
292
293	chanctx->conf.rx_chains_static = rx_chains_static;
294	chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
295	drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
296	}
297
d01a1e65	298	int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
4bf88530	299	const struct cfg80211_chan_def *chandef,
d01a1e65 MK	300	enum ieee80211_chanctx_mode mode)
	301	{
	302	struct ieee80211_local *local = sdata->local;
	303	struct ieee80211_chanctx *ctx;
	304	int ret;
	305
55de908a JB	306	WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
55de908a JB	307
d01a1e65 MK	308	mutex_lock(&local->chanctx_mtx);
	309	__ieee80211_vif_release_channel(sdata);
	310
4bf88530	311	ctx = ieee80211_find_chanctx(local, chandef, mode);
d01a1e65	312	if (!ctx)
4bf88530	313	ctx = ieee80211_new_chanctx(local, chandef, mode);
d01a1e65 MK	314	if (IS_ERR(ctx)) {
	315	ret = PTR_ERR(ctx);
	316	goto out;
	317	}
	318
4bf88530	319	sdata->vif.bss_conf.chandef = *chandef;
55de908a	320
d01a1e65 MK	321	ret = ieee80211_assign_vif_chanctx(sdata, ctx);
	322	if (ret) {
	323	/* if assign fails refcount stays the same */
	324	if (ctx->refcount == 0)
	325	ieee80211_free_chanctx(local, ctx);
	326	goto out;
	327	}
	328
4d76d21b JB	329	if (sdata->vif.type == NL80211_IFTYPE_AP) {
	330	struct ieee80211_sub_if_data *vlan;
	331
	332	/* for the VLAN list */
	333	ASSERT_RTNL();
	334	list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
	335	rcu_assign_pointer(vlan->vif.chanctx_conf, &ctx->conf);
	336	}
	337
04ecd257	338	ieee80211_recalc_smps_chanctx(local, ctx);
d01a1e65 MK	339	out:
	340	mutex_unlock(&local->chanctx_mtx);
	341	return ret;
	342	}
	343
	344	void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
	345	{
55de908a JB	346	WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
55de908a JB	347
d01a1e65 MK	348	mutex_lock(&sdata->local->chanctx_mtx);
	349	__ieee80211_vif_release_channel(sdata);
	350	mutex_unlock(&sdata->local->chanctx_mtx);
	351	}
3448c005	352
4d76d21b JB	353	void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
	354	{
	355	struct ieee80211_local *local = sdata->local;
	356	struct ieee80211_sub_if_data *ap;
	357	struct ieee80211_chanctx_conf *conf;
	358
	359	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN \|\| !sdata->bss))
	360	return;
	361
	362	ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
	363
	364	mutex_lock(&local->chanctx_mtx);
	365
	366	conf = rcu_dereference_protected(ap->vif.chanctx_conf,
	367	lockdep_is_held(&local->chanctx_mtx));
	368	rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
	369	mutex_unlock(&local->chanctx_mtx);
	370	}
	371
3448c005 JB	372	void ieee80211_iter_chan_contexts_atomic(
	373	struct ieee80211_hw *hw,
	374	void (iter)(struct ieee80211_hw hw,
	375	struct ieee80211_chanctx_conf *chanctx_conf,
	376	void *data),
	377	void *iter_data)
	378	{
	379	struct ieee80211_local *local = hw_to_local(hw);
	380	struct ieee80211_chanctx *ctx;
	381
	382	rcu_read_lock();
	383	list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
	384	iter(hw, &ctx->conf, iter_data);
	385	rcu_read_unlock();
	386	}
	387	EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);