[mirror_ubuntu-bionic-kernel.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);

	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_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_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
					 bool clear)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_sub_if_data *vlan;
	struct ieee80211_chanctx_conf *conf;

	ASSERT_RTNL();

	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
		return;

	mutex_lock(&local->chanctx_mtx);

	/*
	 * Check that conf exists, even when clearing this function
	 * must be called with the AP's channel context still there
	 * as it would otherwise cause VLANs to have an invalid
	 * channel context pointer for a while, possibly pointing
	 * to a channel context that has already been freed.
	 */
	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
				lockdep_is_held(&local->chanctx_mtx));
	WARN_ON(!conf);

	if (clear)
		conf = NULL;

	list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
		rcu_assign_pointer(vlan->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)
		if (ctx->driver_present)
			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
	201	ieee80211_unassign_vif_chanctx(sdata, ctx);
	202	if (ctx->refcount == 0)
	203	ieee80211_free_chanctx(local, ctx);
	204	}
	205
04ecd257 JB	206	void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
	207	struct ieee80211_chanctx *chanctx)
	208	{
	209	struct ieee80211_sub_if_data *sdata;
	210	u8 rx_chains_static, rx_chains_dynamic;
	211
	212	lockdep_assert_held(&local->chanctx_mtx);
	213
	214	rx_chains_static = 1;
	215	rx_chains_dynamic = 1;
	216
	217	rcu_read_lock();
	218	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
	219	u8 needed_static, needed_dynamic;
	220
	221	if (!ieee80211_sdata_running(sdata))
	222	continue;
	223
	224	if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
	225	&chanctx->conf)
	226	continue;
	227
	228	switch (sdata->vif.type) {
	229	case NL80211_IFTYPE_P2P_DEVICE:
	230	continue;
	231	case NL80211_IFTYPE_STATION:
	232	if (!sdata->u.mgd.associated)
	233	continue;
	234	break;
	235	case NL80211_IFTYPE_AP_VLAN:
	236	continue;
	237	case NL80211_IFTYPE_AP:
	238	case NL80211_IFTYPE_ADHOC:
	239	case NL80211_IFTYPE_WDS:
	240	case NL80211_IFTYPE_MESH_POINT:
	241	break;
	242	default:
	243	WARN_ON_ONCE(1);
	244	}
	245
	246	switch (sdata->smps_mode) {
	247	default:
	248	WARN_ONCE(1, "Invalid SMPS mode %d\n",
	249	sdata->smps_mode);
	250	/* fall through */
	251	case IEEE80211_SMPS_OFF:
	252	needed_static = sdata->needed_rx_chains;
	253	needed_dynamic = sdata->needed_rx_chains;
	254	break;
	255	case IEEE80211_SMPS_DYNAMIC:
	256	needed_static = 1;
	257	needed_dynamic = sdata->needed_rx_chains;
	258	break;
	259	case IEEE80211_SMPS_STATIC:
	260	needed_static = 1;
	261	needed_dynamic = 1;
	262	break;
	263	}
	264
	265	rx_chains_static = max(rx_chains_static, needed_static);
	266	rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
	267	}
	268	rcu_read_unlock();
	269
270	if (!local->use_chanctx) {
271	if (rx_chains_static > 1)
272	local->smps_mode = IEEE80211_SMPS_OFF;
273	else if (rx_chains_dynamic > 1)
274	local->smps_mode = IEEE80211_SMPS_DYNAMIC;
275	else
276	local->smps_mode = IEEE80211_SMPS_STATIC;
277	ieee80211_hw_config(local, 0);
278	}
279
280	if (rx_chains_static == chanctx->conf.rx_chains_static &&
281	rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
282	return;
283
284	chanctx->conf.rx_chains_static = rx_chains_static;
285	chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
286	drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
287	}
288
d01a1e65	289	int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
4bf88530	290	const struct cfg80211_chan_def *chandef,
d01a1e65 MK	291	enum ieee80211_chanctx_mode mode)
	292	{
	293	struct ieee80211_local *local = sdata->local;
	294	struct ieee80211_chanctx *ctx;
	295	int ret;
	296
55de908a JB	297	WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
55de908a JB	298
d01a1e65 MK	299	mutex_lock(&local->chanctx_mtx);
	300	__ieee80211_vif_release_channel(sdata);
	301
4bf88530	302	ctx = ieee80211_find_chanctx(local, chandef, mode);
d01a1e65	303	if (!ctx)
4bf88530	304	ctx = ieee80211_new_chanctx(local, chandef, mode);
d01a1e65 MK	305	if (IS_ERR(ctx)) {
	306	ret = PTR_ERR(ctx);
	307	goto out;
	308	}
	309
4bf88530	310	sdata->vif.bss_conf.chandef = *chandef;
55de908a	311
d01a1e65 MK	312	ret = ieee80211_assign_vif_chanctx(sdata, ctx);
	313	if (ret) {
	314	/* if assign fails refcount stays the same */
	315	if (ctx->refcount == 0)
	316	ieee80211_free_chanctx(local, ctx);
	317	goto out;
	318	}
	319
04ecd257	320	ieee80211_recalc_smps_chanctx(local, ctx);
d01a1e65 MK	321	out:
	322	mutex_unlock(&local->chanctx_mtx);
	323	return ret;
	324	}
	325
	326	void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
	327	{
55de908a JB	328	WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
55de908a JB	329
d01a1e65 MK	330	mutex_lock(&sdata->local->chanctx_mtx);
	331	__ieee80211_vif_release_channel(sdata);
	332	mutex_unlock(&sdata->local->chanctx_mtx);
	333	}
3448c005	334
4d76d21b JB	335	void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
	336	{
	337	struct ieee80211_local *local = sdata->local;
	338	struct ieee80211_sub_if_data *ap;
	339	struct ieee80211_chanctx_conf *conf;
	340
	341	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN \|\| !sdata->bss))
	342	return;
	343
	344	ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
	345
	346	mutex_lock(&local->chanctx_mtx);
	347
	348	conf = rcu_dereference_protected(ap->vif.chanctx_conf,
	349	lockdep_is_held(&local->chanctx_mtx));
	350	rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
	351	mutex_unlock(&local->chanctx_mtx);
	352	}
	353
1f4ac5a6 JB	354	void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
	355	bool clear)
	356	{
	357	struct ieee80211_local *local = sdata->local;
	358	struct ieee80211_sub_if_data *vlan;
	359	struct ieee80211_chanctx_conf *conf;
	360
	361	ASSERT_RTNL();
	362
	363	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
	364	return;
	365
	366	mutex_lock(&local->chanctx_mtx);
	367
	368	/*
	369	* Check that conf exists, even when clearing this function
	370	* must be called with the AP's channel context still there
	371	* as it would otherwise cause VLANs to have an invalid
	372	* channel context pointer for a while, possibly pointing
	373	* to a channel context that has already been freed.
	374	*/
	375	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
	376	lockdep_is_held(&local->chanctx_mtx));
	377	WARN_ON(!conf);
	378
	379	if (clear)
	380	conf = NULL;
	381
	382	list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
	383	rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
	384
	385	mutex_unlock(&local->chanctx_mtx);
	386	}
	387
3448c005 JB	388	void ieee80211_iter_chan_contexts_atomic(
	389	struct ieee80211_hw *hw,
	390	void (iter)(struct ieee80211_hw hw,
	391	struct ieee80211_chanctx_conf *chanctx_conf,
	392	void *data),
	393	void *iter_data)
	394	{
	395	struct ieee80211_local *local = hw_to_local(hw);
	396	struct ieee80211_chanctx *ctx;
	397
	398	rcu_read_lock();
	399	list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
8a61af65 JB	400	if (ctx->driver_present)
8a61af65 JB	401	iter(hw, &ctx->conf, iter_data);
3448c005 JB	402	rcu_read_unlock();
	403	}
	404	EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);