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

/*
 * mac80211 - channel management
 */

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

static bool
ieee80211_channel_types_are_compatible(enum nl80211_channel_type chantype1,
				       enum nl80211_channel_type chantype2,
				       enum nl80211_channel_type *compat)
{
	/*
	 * start out with chantype1 being the result,
	 * overwriting later if needed
	 */
	if (compat)
		*compat = chantype1;

	switch (chantype1) {
	case NL80211_CHAN_NO_HT:
		if (compat)
			*compat = chantype2;
		break;
	case NL80211_CHAN_HT20:
		/*
		 * allow any change that doesn't go to no-HT
		 * (if it already is no-HT no change is needed)
		 */
		if (chantype2 == NL80211_CHAN_NO_HT)
			break;
		if (compat)
			*compat = chantype2;
		break;
	case NL80211_CHAN_HT40PLUS:
	case NL80211_CHAN_HT40MINUS:
		/* allow smaller bandwidth and same */
		if (chantype2 == NL80211_CHAN_NO_HT)
			break;
		if (chantype2 == NL80211_CHAN_HT20)
			break;
		if (chantype2 == chantype1)
			break;
		return false;
	}

	return true;
}

static void ieee80211_change_chantype(struct ieee80211_local *local,
				      struct ieee80211_chanctx *ctx,
				      enum nl80211_channel_type chantype)
{
	if (chantype == ctx->conf.channel_type)
		return;

	ctx->conf.channel_type = chantype;
	drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_CHANNEL_TYPE);

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

static struct ieee80211_chanctx *
ieee80211_find_chanctx(struct ieee80211_local *local,
		       struct ieee80211_channel *channel,
		       enum nl80211_channel_type channel_type,
		       enum ieee80211_chanctx_mode mode)
{
	struct ieee80211_chanctx *ctx;
	enum nl80211_channel_type compat_type;

	lockdep_assert_held(&local->chanctx_mtx);

	if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
		return NULL;
	if (WARN_ON(!channel))
		return NULL;

	list_for_each_entry(ctx, &local->chanctx_list, list) {
		compat_type = ctx->conf.channel_type;

		if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
			continue;
		if (ctx->conf.channel != channel)
			continue;
		if (!ieee80211_channel_types_are_compatible(ctx->conf.channel_type,
							    channel_type,
							    &compat_type))
			continue;

		ieee80211_change_chantype(local, ctx, compat_type);

		return ctx;
	}

	return NULL;
}

static struct ieee80211_chanctx *
ieee80211_new_chanctx(struct ieee80211_local *local,
		      struct ieee80211_channel *channel,
		      enum nl80211_channel_type channel_type,
		      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.channel = channel;
	ctx->conf.channel_type = channel_type;
	ctx->conf.rx_chains_static = 1;
	ctx->conf.rx_chains_dynamic = 1;
	ctx->mode = mode;

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

	list_add(&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(&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++;

	return 0;
}

static enum nl80211_channel_type
ieee80211_calc_chantype(struct ieee80211_local *local,
			struct ieee80211_chanctx *ctx)
{
	struct ieee80211_chanctx_conf *conf = &ctx->conf;
	struct ieee80211_sub_if_data *sdata;
	enum nl80211_channel_type result = NL80211_CHAN_NO_HT;

	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;

		WARN_ON_ONCE(!ieee80211_channel_types_are_compatible(
					sdata->vif.bss_conf.channel_type,
					result, &result));
	}
	rcu_read_unlock();

	return result;
}

static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
					      struct ieee80211_chanctx *ctx)
{
	enum nl80211_channel_type chantype;

	lockdep_assert_held(&local->chanctx_mtx);

	chantype = ieee80211_calc_chantype(local, ctx);
	ieee80211_change_chantype(local, ctx, chantype);
}

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,
			      struct ieee80211_channel *channel,
			      enum nl80211_channel_type channel_type,
			      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, channel, channel_type, mode);
	if (!ctx)
		ctx = ieee80211_new_chanctx(local, channel, channel_type, mode);
	if (IS_ERR(ctx)) {
		ret = PTR_ERR(ctx);
		goto out;
	}

	sdata->vif.bss_conf.channel_type = channel_type;

	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);
}
Commit	Line	Data
f444de05 JB	1	/*
	2	* mac80211 - channel management
	3	*/
	4
0aaffa9b	5	#include <linux/nl80211.h>
3117bbdb	6	#include <net/cfg80211.h>
f444de05	7	#include "ieee80211_i.h"
35f2fce9	8	#include "driver-ops.h"
f444de05	9
23a85b45 MK	10	static bool
	11	ieee80211_channel_types_are_compatible(enum nl80211_channel_type chantype1,
	12	enum nl80211_channel_type chantype2,
	13	enum nl80211_channel_type *compat)
	14	{
	15	/*
	16	* start out with chantype1 being the result,
	17	* overwriting later if needed
	18	*/
	19	if (compat)
	20	*compat = chantype1;
	21
	22	switch (chantype1) {
0aaffa9b	23	case NL80211_CHAN_NO_HT:
23a85b45 MK	24	if (compat)
	25	*compat = chantype2;
	26	break;
0aaffa9b JB	27	case NL80211_CHAN_HT20:
	28	/*
	29	* allow any change that doesn't go to no-HT
	30	* (if it already is no-HT no change is needed)
	31	*/
23a85b45	32	if (chantype2 == NL80211_CHAN_NO_HT)
0aaffa9b	33	break;
23a85b45 MK	34	if (compat)
23a85b45 MK	35	*compat = chantype2;
0aaffa9b JB	36	break;
	37	case NL80211_CHAN_HT40PLUS:
	38	case NL80211_CHAN_HT40MINUS:
	39	/* allow smaller bandwidth and same */
23a85b45	40	if (chantype2 == NL80211_CHAN_NO_HT)
0aaffa9b	41	break;
23a85b45	42	if (chantype2 == NL80211_CHAN_HT20)
0aaffa9b	43	break;
23a85b45	44	if (chantype2 == chantype1)
0aaffa9b	45	break;
23a85b45	46	return false;
0aaffa9b JB	47	}
0aaffa9b JB	48
23a85b45 MK	49	return true;
	50	}
	51
e89a96f5 MK	52	static void ieee80211_change_chantype(struct ieee80211_local *local,
	53	struct ieee80211_chanctx *ctx,
	54	enum nl80211_channel_type chantype)
	55	{
	56	if (chantype == ctx->conf.channel_type)
	57	return;
0aaffa9b	58
e89a96f5 MK	59	ctx->conf.channel_type = chantype;
e89a96f5 MK	60	drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_CHANNEL_TYPE);
55de908a JB	61
	62	if (!local->use_chanctx) {
	63	local->_oper_channel_type = chantype;
	64	ieee80211_hw_config(local, 0);
	65	}
0aaffa9b	66	}
d01a1e65 MK	67
	68	static struct ieee80211_chanctx *
	69	ieee80211_find_chanctx(struct ieee80211_local *local,
	70	struct ieee80211_channel *channel,
	71	enum nl80211_channel_type channel_type,
	72	enum ieee80211_chanctx_mode mode)
	73	{
	74	struct ieee80211_chanctx *ctx;
e89a96f5	75	enum nl80211_channel_type compat_type;
d01a1e65 MK	76
	77	lockdep_assert_held(&local->chanctx_mtx);
	78
	79	if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
	80	return NULL;
	81	if (WARN_ON(!channel))
	82	return NULL;
	83
	84	list_for_each_entry(ctx, &local->chanctx_list, list) {
e89a96f5 MK	85	compat_type = ctx->conf.channel_type;
e89a96f5 MK	86
d01a1e65 MK	87	if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
	88	continue;
	89	if (ctx->conf.channel != channel)
	90	continue;
e89a96f5 MK	91	if (!ieee80211_channel_types_are_compatible(ctx->conf.channel_type,
	92	channel_type,
	93	&compat_type))
d01a1e65 MK	94	continue;
d01a1e65 MK	95
e89a96f5 MK	96	ieee80211_change_chantype(local, ctx, compat_type);
e89a96f5 MK	97
d01a1e65 MK	98	return ctx;
	99	}
	100
	101	return NULL;
	102	}
	103
	104	static struct ieee80211_chanctx *
	105	ieee80211_new_chanctx(struct ieee80211_local *local,
	106	struct ieee80211_channel *channel,
	107	enum nl80211_channel_type channel_type,
	108	enum ieee80211_chanctx_mode mode)
	109	{
	110	struct ieee80211_chanctx *ctx;
35f2fce9	111	int err;
d01a1e65 MK	112
	113	lockdep_assert_held(&local->chanctx_mtx);
	114
	115	ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
	116	if (!ctx)
	117	return ERR_PTR(-ENOMEM);
	118
	119	ctx->conf.channel = channel;
	120	ctx->conf.channel_type = channel_type;
04ecd257 JB	121	ctx->conf.rx_chains_static = 1;
04ecd257 JB	122	ctx->conf.rx_chains_dynamic = 1;
d01a1e65 MK	123	ctx->mode = mode;
d01a1e65 MK	124
55de908a JB	125	if (!local->use_chanctx) {
	126	local->_oper_channel_type = channel_type;
	127	local->_oper_channel = channel;
	128	ieee80211_hw_config(local, 0);
	129	} else {
	130	err = drv_add_chanctx(local, ctx);
	131	if (err) {
	132	kfree(ctx);
	133	return ERR_PTR(err);
	134	}
35f2fce9 MK	135	}
35f2fce9 MK	136
d01a1e65 MK	137	list_add(&ctx->list, &local->chanctx_list);
	138
	139	return ctx;
	140	}
	141
	142	static void ieee80211_free_chanctx(struct ieee80211_local *local,
	143	struct ieee80211_chanctx *ctx)
	144	{
	145	lockdep_assert_held(&local->chanctx_mtx);
	146
	147	WARN_ON_ONCE(ctx->refcount != 0);
	148
55de908a JB	149	if (!local->use_chanctx) {
	150	local->_oper_channel_type = NL80211_CHAN_NO_HT;
	151	ieee80211_hw_config(local, 0);
	152	} else {
	153	drv_remove_chanctx(local, ctx);
	154	}
35f2fce9	155
d01a1e65 MK	156	list_del(&ctx->list);
	157	kfree_rcu(ctx, rcu_head);
	158	}
	159
	160	static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
	161	struct ieee80211_chanctx *ctx)
	162	{
35f2fce9 MK	163	struct ieee80211_local *local = sdata->local;
35f2fce9 MK	164	int ret;
d01a1e65 MK	165
	166	lockdep_assert_held(&local->chanctx_mtx);
	167
35f2fce9 MK	168	ret = drv_assign_vif_chanctx(local, sdata, ctx);
	169	if (ret)
	170	return ret;
	171
d01a1e65 MK	172	rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
	173	ctx->refcount++;
	174
	175	return 0;
	176	}
	177
e89a96f5 MK	178	static enum nl80211_channel_type
	179	ieee80211_calc_chantype(struct ieee80211_local *local,
	180	struct ieee80211_chanctx *ctx)
	181	{
	182	struct ieee80211_chanctx_conf *conf = &ctx->conf;
	183	struct ieee80211_sub_if_data *sdata;
	184	enum nl80211_channel_type result = NL80211_CHAN_NO_HT;
	185
	186	lockdep_assert_held(&local->chanctx_mtx);
	187
	188	rcu_read_lock();
	189	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
	190	if (!ieee80211_sdata_running(sdata))
	191	continue;
	192	if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
	193	continue;
	194
	195	WARN_ON_ONCE(!ieee80211_channel_types_are_compatible(
	196	sdata->vif.bss_conf.channel_type,
	197	result, &result));
	198	}
	199	rcu_read_unlock();
	200
	201	return result;
	202	}
	203
	204	static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
	205	struct ieee80211_chanctx *ctx)
	206	{
	207	enum nl80211_channel_type chantype;
	208
	209	lockdep_assert_held(&local->chanctx_mtx);
	210
	211	chantype = ieee80211_calc_chantype(local, ctx);
	212	ieee80211_change_chantype(local, ctx, chantype);
	213	}
	214
d01a1e65 MK	215	static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
	216	struct ieee80211_chanctx *ctx)
	217	{
35f2fce9	218	struct ieee80211_local *local = sdata->local;
d01a1e65 MK	219
	220	lockdep_assert_held(&local->chanctx_mtx);
	221
	222	ctx->refcount--;
	223	rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
35f2fce9 MK	224
35f2fce9 MK	225	drv_unassign_vif_chanctx(local, sdata, ctx);
e89a96f5	226
04ecd257	227	if (ctx->refcount > 0) {
e89a96f5	228	ieee80211_recalc_chanctx_chantype(sdata->local, ctx);
04ecd257 JB	229	ieee80211_recalc_smps_chanctx(local, ctx);
04ecd257 JB	230	}
d01a1e65 MK	231	}
	232
	233	static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
	234	{
	235	struct ieee80211_local *local = sdata->local;
	236	struct ieee80211_chanctx_conf *conf;
	237	struct ieee80211_chanctx *ctx;
	238
	239	lockdep_assert_held(&local->chanctx_mtx);
	240
	241	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
	242	lockdep_is_held(&local->chanctx_mtx));
	243	if (!conf)
	244	return;
	245
	246	ctx = container_of(conf, struct ieee80211_chanctx, conf);
	247
	248	ieee80211_unassign_vif_chanctx(sdata, ctx);
	249	if (ctx->refcount == 0)
	250	ieee80211_free_chanctx(local, ctx);
	251	}
	252
04ecd257 JB	253	void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
	254	struct ieee80211_chanctx *chanctx)
	255	{
	256	struct ieee80211_sub_if_data *sdata;
	257	u8 rx_chains_static, rx_chains_dynamic;
	258
	259	lockdep_assert_held(&local->chanctx_mtx);
	260
	261	rx_chains_static = 1;
	262	rx_chains_dynamic = 1;
	263
	264	rcu_read_lock();
	265	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
	266	u8 needed_static, needed_dynamic;
	267
	268	if (!ieee80211_sdata_running(sdata))
	269	continue;
	270
	271	if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
	272	&chanctx->conf)
	273	continue;
	274
	275	switch (sdata->vif.type) {
	276	case NL80211_IFTYPE_P2P_DEVICE:
	277	continue;
	278	case NL80211_IFTYPE_STATION:
	279	if (!sdata->u.mgd.associated)
	280	continue;
	281	break;
	282	case NL80211_IFTYPE_AP_VLAN:
	283	continue;
	284	case NL80211_IFTYPE_AP:
	285	case NL80211_IFTYPE_ADHOC:
	286	case NL80211_IFTYPE_WDS:
	287	case NL80211_IFTYPE_MESH_POINT:
	288	break;
	289	default:
	290	WARN_ON_ONCE(1);
	291	}
	292
	293	switch (sdata->smps_mode) {
	294	default:
	295	WARN_ONCE(1, "Invalid SMPS mode %d\n",
	296	sdata->smps_mode);
	297	/* fall through */
	298	case IEEE80211_SMPS_OFF:
	299	needed_static = sdata->needed_rx_chains;
	300	needed_dynamic = sdata->needed_rx_chains;
	301	break;
	302	case IEEE80211_SMPS_DYNAMIC:
	303	needed_static = 1;
	304	needed_dynamic = sdata->needed_rx_chains;
	305	break;
	306	case IEEE80211_SMPS_STATIC:
	307	needed_static = 1;
	308	needed_dynamic = 1;
	309	break;
	310	}
	311
	312	rx_chains_static = max(rx_chains_static, needed_static);
	313	rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
	314	}
	315	rcu_read_unlock();
	316
317	if (!local->use_chanctx) {
318	if (rx_chains_static > 1)
319	local->smps_mode = IEEE80211_SMPS_OFF;
320	else if (rx_chains_dynamic > 1)
321	local->smps_mode = IEEE80211_SMPS_DYNAMIC;
322	else
323	local->smps_mode = IEEE80211_SMPS_STATIC;
324	ieee80211_hw_config(local, 0);
325	}
326
327	if (rx_chains_static == chanctx->conf.rx_chains_static &&
328	rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
329	return;
330
331	chanctx->conf.rx_chains_static = rx_chains_static;
332	chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
333	drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
334	}
335
d01a1e65 MK	336	int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
	337	struct ieee80211_channel *channel,
	338	enum nl80211_channel_type channel_type,
	339	enum ieee80211_chanctx_mode mode)
	340	{
	341	struct ieee80211_local *local = sdata->local;
	342	struct ieee80211_chanctx *ctx;
	343	int ret;
	344
55de908a JB	345	WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
55de908a JB	346
d01a1e65 MK	347	mutex_lock(&local->chanctx_mtx);
	348	__ieee80211_vif_release_channel(sdata);
	349
	350	ctx = ieee80211_find_chanctx(local, channel, channel_type, mode);
	351	if (!ctx)
	352	ctx = ieee80211_new_chanctx(local, channel, channel_type, mode);
	353	if (IS_ERR(ctx)) {
	354	ret = PTR_ERR(ctx);
	355	goto out;
	356	}
	357
55de908a JB	358	sdata->vif.bss_conf.channel_type = channel_type;
55de908a JB	359
d01a1e65 MK	360	ret = ieee80211_assign_vif_chanctx(sdata, ctx);
	361	if (ret) {
	362	/* if assign fails refcount stays the same */
	363	if (ctx->refcount == 0)
	364	ieee80211_free_chanctx(local, ctx);
	365	goto out;
	366	}
	367
04ecd257	368	ieee80211_recalc_smps_chanctx(local, ctx);
d01a1e65 MK	369	out:
	370	mutex_unlock(&local->chanctx_mtx);
	371	return ret;
	372	}
	373
	374	void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
	375	{
55de908a JB	376	WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
55de908a JB	377
d01a1e65 MK	378	mutex_lock(&sdata->local->chanctx_mtx);
	379	__ieee80211_vif_release_channel(sdata);
	380	mutex_unlock(&sdata->local->chanctx_mtx);
	381	}