diff --git a/drivers/net/wireless/ath/ath6kl/cfg80211.c b/drivers/net/wireless/ath/ath6kl/cfg80211.c
index c0cc2e59fe6..51bbe85c574 100644
--- a/drivers/net/wireless/ath/ath6kl/cfg80211.c
+++ b/drivers/net/wireless/ath/ath6kl/cfg80211.c
@@ -1099,12 +1099,10 @@ void ath6kl_cfg80211_ch_switch_notify(struct ath6kl_vif *vif, int freq,
 		   "channel switch notify nw_type %d freq %d mode %d\n",
 		   vif->nw_type, freq, mode);
 
-	chandef.chan = ieee80211_get_channel(vif->ar->wiphy, freq);
-	if (WARN_ON(!chandef.chan))
-		return;
-
-	chandef._type = (mode == WMI_11G_HT20) ?
-		NL80211_CHAN_HT20 : NL80211_CHAN_NO_HT;
+	cfg80211_chandef_create(&chandef,
+				ieee80211_get_channel(vif->ar->wiphy, freq),
+				(mode == WMI_11G_HT20) ?
+					NL80211_CHAN_HT20 : NL80211_CHAN_NO_HT);
 
 	cfg80211_ch_switch_notify(vif->ndev, &chandef);
 }
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 86f777af79e..977da58fb7e 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -308,20 +308,85 @@ struct key_params {
 /**
  * struct cfg80211_chan_def - channel definition
  * @chan: the (control) channel
- * @_type: the channel type, don't use this field,
- *	use cfg80211_get_chandef_type() if needed.
+ * @width: channel width
+ * @center_freq1: center frequency of first segment
+ * @center_freq2: center frequency of second segment
+ *	(only with 80+80 MHz)
  */
 struct cfg80211_chan_def {
 	struct ieee80211_channel *chan;
-	enum nl80211_channel_type _type;
+	enum nl80211_chan_width width;
+	u32 center_freq1;
+	u32 center_freq2;
 };
 
+/**
+ * cfg80211_get_chandef_type - return old channel type from chandef
+ * @chandef: the channel definition
+ *
+ * Returns the old channel type (NOHT, HT20, HT40+/-) from a given
+ * chandef, which must have a bandwidth allowing this conversion.
+ */
 static inline enum nl80211_channel_type
 cfg80211_get_chandef_type(const struct cfg80211_chan_def *chandef)
 {
-	return chandef->_type;
+	switch (chandef->width) {
+	case NL80211_CHAN_WIDTH_20_NOHT:
+		return NL80211_CHAN_NO_HT;
+	case NL80211_CHAN_WIDTH_20:
+		return NL80211_CHAN_HT20;
+	case NL80211_CHAN_WIDTH_40:
+		if (chandef->center_freq1 > chandef->chan->center_freq)
+			return NL80211_CHAN_HT40PLUS;
+		return NL80211_CHAN_HT40MINUS;
+	default:
+		WARN_ON(1);
+		return NL80211_CHAN_NO_HT;
+	}
 }
 
+/**
+ * cfg80211_chandef_create - create channel definition using channel type
+ * @chandef: the channel definition struct to fill
+ * @channel: the control channel
+ * @chantype: the channel type
+ *
+ * Given a channel type, create a channel definition.
+ */
+void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
+			     struct ieee80211_channel *channel,
+			     enum nl80211_channel_type chantype);
+
+/**
+ * cfg80211_chandef_identical - check if two channel definitions are identical
+ * @chandef1: first channel definition
+ * @chandef2: second channel definition
+ *
+ * Returns %true if the channels defined by the channel definitions are
+ * identical, %false otherwise.
+ */
+static inline bool
+cfg80211_chandef_identical(const struct cfg80211_chan_def *chandef1,
+			   const struct cfg80211_chan_def *chandef2)
+{
+	return (chandef1->chan == chandef2->chan &&
+		chandef1->width == chandef2->width &&
+		chandef1->center_freq1 == chandef2->center_freq1 &&
+		chandef1->center_freq2 == chandef2->center_freq2);
+}
+
+/**
+ * cfg80211_chandef_compatible - check if two channel definitions are compatible
+ * @chandef1: first channel definition
+ * @chandef2: second channel definition
+ *
+ * Returns %NULL if the given channel definitions are incompatible,
+ * chandef1 or chandef2 otherwise.
+ */
+const struct cfg80211_chan_def *
+cfg80211_chandef_compatible(const struct cfg80211_chan_def *chandef1,
+			    const struct cfg80211_chan_def *chandef2);
+
 /**
  * enum survey_info_flags - survey information flags
  *
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 82b5ad38435..84f9c7d84c6 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -118,8 +118,9 @@
  *	to get a list of all present wiphys.
  * @NL80211_CMD_SET_WIPHY: set wiphy parameters, needs %NL80211_ATTR_WIPHY or
  *	%NL80211_ATTR_IFINDEX; can be used to set %NL80211_ATTR_WIPHY_NAME,
- *	%NL80211_ATTR_WIPHY_TXQ_PARAMS, %NL80211_ATTR_WIPHY_FREQ,
- *	%NL80211_ATTR_WIPHY_CHANNEL_TYPE, %NL80211_ATTR_WIPHY_RETRY_SHORT,
+ *	%NL80211_ATTR_WIPHY_TXQ_PARAMS, %NL80211_ATTR_WIPHY_FREQ (and the
+ *	attributes determining the channel width; this is used for setting
+ *	monitor mode channel),  %NL80211_ATTR_WIPHY_RETRY_SHORT,
  *	%NL80211_ATTR_WIPHY_RETRY_LONG, %NL80211_ATTR_WIPHY_FRAG_THRESHOLD,
  *	and/or %NL80211_ATTR_WIPHY_RTS_THRESHOLD.
  *	However, for setting the channel, see %NL80211_CMD_SET_CHANNEL
@@ -171,7 +172,7 @@
  *	%NL80211_ATTR_AKM_SUITES, %NL80211_ATTR_PRIVACY,
  *	%NL80211_ATTR_AUTH_TYPE and %NL80211_ATTR_INACTIVITY_TIMEOUT.
  *	The channel to use can be set on the interface or be given using the
- *	%NL80211_ATTR_WIPHY_FREQ and %NL80211_ATTR_WIPHY_CHANNEL_TYPE attrs.
+ *	%NL80211_ATTR_WIPHY_FREQ and the attributes determining channel width.
  * @NL80211_CMD_NEW_BEACON: old alias for %NL80211_CMD_START_AP
  * @NL80211_CMD_STOP_AP: Stop AP operation on the given interface
  * @NL80211_CMD_DEL_BEACON: old alias for %NL80211_CMD_STOP_AP
@@ -471,8 +472,8 @@
  *	command is used as an event to indicate the that a trigger level was
  *	reached.
  * @NL80211_CMD_SET_CHANNEL: Set the channel (using %NL80211_ATTR_WIPHY_FREQ
- *	and %NL80211_ATTR_WIPHY_CHANNEL_TYPE) the given interface (identifed
- *	by %NL80211_ATTR_IFINDEX) shall operate on.
+ *	and the attributes determining channel width) the given interface
+ *	(identifed by %NL80211_ATTR_IFINDEX) shall operate on.
  *	In case multiple channels are supported by the device, the mechanism
  *	with which it switches channels is implementation-defined.
  *	When a monitor interface is given, it can only switch channel while
@@ -566,8 +567,8 @@
  *
  * @NL80211_CMD_CH_SWITCH_NOTIFY: An AP or GO may decide to switch channels
  *	independently of the userspace SME, send this event indicating
- *	%NL80211_ATTR_IFINDEX is now on %NL80211_ATTR_WIPHY_FREQ with
- *	%NL80211_ATTR_WIPHY_CHANNEL_TYPE.
+ *	%NL80211_ATTR_IFINDEX is now on %NL80211_ATTR_WIPHY_FREQ and the
+ *	attributes determining channel width.
  *
  * @NL80211_CMD_START_P2P_DEVICE: Start the given P2P Device, identified by
  *	its %NL80211_ATTR_WDEV identifier. It must have been created with
@@ -771,14 +772,26 @@ enum nl80211_commands {
  *	/sys/class/ieee80211/<phyname>/index
  * @NL80211_ATTR_WIPHY_NAME: wiphy name (used for renaming)
  * @NL80211_ATTR_WIPHY_TXQ_PARAMS: a nested array of TX queue parameters
- * @NL80211_ATTR_WIPHY_FREQ: frequency of the selected channel in MHz
+ * @NL80211_ATTR_WIPHY_FREQ: frequency of the selected channel in MHz,
+ *	defines the channel together with the (deprecated)
+ *	%NL80211_ATTR_WIPHY_CHANNEL_TYPE attribute or the attributes
+ *	%NL80211_ATTR_CHANNEL_WIDTH and if needed %NL80211_ATTR_CENTER_FREQ1
+ *	and %NL80211_ATTR_CENTER_FREQ2
+ * @NL80211_ATTR_CHANNEL_WIDTH: u32 attribute containing one of the values
+ *	of &enum nl80211_chan_width, describing the channel width. See the
+ *	documentation of the enum for more information.
+ * @NL80211_ATTR_CENTER_FREQ1: Center frequency of the first part of the
+ *	channel, used for anything but 20 MHz bandwidth
+ * @NL80211_ATTR_CENTER_FREQ2: Center frequency of the second part of the
+ *	channel, used only for 80+80 MHz bandwidth
  * @NL80211_ATTR_WIPHY_CHANNEL_TYPE: included with NL80211_ATTR_WIPHY_FREQ
- *	if HT20 or HT40 are allowed (i.e., 802.11n disabled if not included):
+ *	if HT20 or HT40 are to be used (i.e., HT disabled if not included):
  *	NL80211_CHAN_NO_HT = HT not allowed (i.e., same as not including
  *		this attribute)
  *	NL80211_CHAN_HT20 = HT20 only
  *	NL80211_CHAN_HT40MINUS = secondary channel is below the primary channel
  *	NL80211_CHAN_HT40PLUS = secondary channel is above the primary channel
+ *	This attribute is now deprecated.
  * @NL80211_ATTR_WIPHY_RETRY_SHORT: TX retry limit for frames whose length is
  *	less than or equal to the RTS threshold; allowed range: 1..255;
  *	dot11ShortRetryLimit; u8
@@ -1553,6 +1566,10 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_SCAN_FLAGS,
 
+	NL80211_ATTR_CHANNEL_WIDTH,
+	NL80211_ATTR_CENTER_FREQ1,
+	NL80211_ATTR_CENTER_FREQ2,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
@@ -2454,6 +2471,32 @@ enum nl80211_channel_type {
 	NL80211_CHAN_HT40PLUS
 };
 
+/**
+ * enum nl80211_chan_width - channel width definitions
+ *
+ * These values are used with the %NL80211_ATTR_CHANNEL_WIDTH
+ * attribute.
+ *
+ * @NL80211_CHAN_WIDTH_20_NOHT: 20 MHz, non-HT channel
+ * @NL80211_CHAN_WIDTH_20: 20 MHz HT channel
+ * @NL80211_CHAN_WIDTH_40: 40 MHz channel, the %NL80211_ATTR_CENTER_FREQ1
+ *	attribute must be provided as well
+ * @NL80211_CHAN_WIDTH_80: 80 MHz channel, the %NL80211_ATTR_CENTER_FREQ1
+ *	attribute must be provided as well
+ * @NL80211_CHAN_WIDTH_80P80: 80+80 MHz channel, the %NL80211_ATTR_CENTER_FREQ1
+ *	and %NL80211_ATTR_CENTER_FREQ2 attributes must be provided as well
+ * @NL80211_CHAN_WIDTH_160: 160 MHz channel, the %NL80211_ATTR_CENTER_FREQ1
+ *	attribute must be provided as well
+ */
+enum nl80211_chan_width {
+	NL80211_CHAN_WIDTH_20_NOHT,
+	NL80211_CHAN_WIDTH_20,
+	NL80211_CHAN_WIDTH_40,
+	NL80211_CHAN_WIDTH_80,
+	NL80211_CHAN_WIDTH_80P80,
+	NL80211_CHAN_WIDTH_160,
+};
+
 /**
  * enum nl80211_bss - netlink attributes for a BSS
  *
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index fbb2d072cb9..7136b945798 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -3125,8 +3125,9 @@ static int ieee80211_cfg_get_channel(struct wiphy *wiphy,
 	rcu_read_lock();
 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 	if (chanctx_conf) {
-		chandef->chan = chanctx_conf->channel;
-		chandef->_type = chanctx_conf->channel_type;
+		cfg80211_chandef_create(chandef,
+					chanctx_conf->channel,
+					chanctx_conf->channel_type);
 		ret = 0;
 	}
 	rcu_read_unlock();
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index bed616fd97e..5648bbed240 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -52,6 +52,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 	u32 bss_change;
 	u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
 	struct cfg80211_chan_def chandef;
+	enum nl80211_channel_type chan_type;
 
 	lockdep_assert_held(&ifibss->mtx);
 
@@ -79,13 +80,13 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 
 	sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
 
-	chandef.chan = chan;
-	chandef._type = ifibss->channel_type;
+	chan_type = ifibss->channel_type;
+	cfg80211_chandef_create(&chandef, chan, chan_type);
 	if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef))
-		chandef._type = NL80211_CHAN_HT20;
+		chan_type = NL80211_CHAN_HT20;
 
 	ieee80211_vif_release_channel(sdata);
-	if (ieee80211_vif_use_channel(sdata, chan, chandef._type,
+	if (ieee80211_vif_use_channel(sdata, chan, chan_type,
 				      ifibss->fixed_channel ?
 					IEEE80211_CHANCTX_SHARED :
 					IEEE80211_CHANCTX_EXCLUSIVE)) {
@@ -159,7 +160,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 		       ifibss->ie, ifibss->ie_len);
 
 	/* add HT capability and information IEs */
-	if (chandef._type != NL80211_CHAN_NO_HT &&
+	if (chan_type != NL80211_CHAN_NO_HT &&
 	    sband->ht_cap.ht_supported) {
 		pos = skb_put(skb, 4 +
 				   sizeof(struct ieee80211_ht_cap) +
@@ -172,7 +173,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 		 * keep them at 0
 		 */
 		pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap,
-						 chan, chandef._type, 0);
+						 chan, chan_type, 0);
 	}
 
 	if (local->hw.queues >= IEEE80211_NUM_ACS) {
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index e834422de40..bf2dfd54ff3 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -11,43 +11,252 @@
 #include "core.h"
 #include "rdev-ops.h"
 
+void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
+			     struct ieee80211_channel *chan,
+			     enum nl80211_channel_type chan_type)
+{
+	if (WARN_ON(!chan))
+		return;
+
+	chandef->chan = chan;
+	chandef->center_freq2 = 0;
+
+	switch (chan_type) {
+	case NL80211_CHAN_NO_HT:
+		chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
+		chandef->center_freq1 = chan->center_freq;
+		break;
+	case NL80211_CHAN_HT20:
+		chandef->width = NL80211_CHAN_WIDTH_20;
+		chandef->center_freq1 = chan->center_freq;
+		break;
+	case NL80211_CHAN_HT40PLUS:
+		chandef->width = NL80211_CHAN_WIDTH_40;
+		chandef->center_freq1 = chan->center_freq + 10;
+		break;
+	case NL80211_CHAN_HT40MINUS:
+		chandef->width = NL80211_CHAN_WIDTH_40;
+		chandef->center_freq1 = chan->center_freq - 10;
+		break;
+	default:
+		WARN_ON(1);
+	}
+}
+EXPORT_SYMBOL(cfg80211_chandef_create);
+
+bool cfg80211_chan_def_valid(const struct cfg80211_chan_def *chandef)
+{
+	u32 control_freq;
+
+	if (!chandef->chan)
+		return false;
+
+	control_freq = chandef->chan->center_freq;
+
+	switch (chandef->width) {
+	case NL80211_CHAN_WIDTH_20:
+	case NL80211_CHAN_WIDTH_20_NOHT:
+		if (chandef->center_freq1 != control_freq)
+			return false;
+		if (chandef->center_freq2)
+			return false;
+		break;
+	case NL80211_CHAN_WIDTH_40:
+		if (chandef->center_freq1 != control_freq + 10 &&
+		    chandef->center_freq1 != control_freq - 10)
+			return false;
+		if (chandef->center_freq2)
+			return false;
+		break;
+	case NL80211_CHAN_WIDTH_80P80:
+		if (chandef->center_freq1 != control_freq + 30 &&
+		    chandef->center_freq1 != control_freq + 10 &&
+		    chandef->center_freq1 != control_freq - 10 &&
+		    chandef->center_freq1 != control_freq - 30)
+			return false;
+		if (!chandef->center_freq2)
+			return false;
+		break;
+	case NL80211_CHAN_WIDTH_80:
+		if (chandef->center_freq1 != control_freq + 30 &&
+		    chandef->center_freq1 != control_freq + 10 &&
+		    chandef->center_freq1 != control_freq - 10 &&
+		    chandef->center_freq1 != control_freq - 30)
+			return false;
+		if (chandef->center_freq2)
+			return false;
+		break;
+	case NL80211_CHAN_WIDTH_160:
+		if (chandef->center_freq1 != control_freq + 70 &&
+		    chandef->center_freq1 != control_freq + 50 &&
+		    chandef->center_freq1 != control_freq + 30 &&
+		    chandef->center_freq1 != control_freq + 10 &&
+		    chandef->center_freq1 != control_freq - 10 &&
+		    chandef->center_freq1 != control_freq - 30 &&
+		    chandef->center_freq1 != control_freq - 50 &&
+		    chandef->center_freq1 != control_freq - 70)
+			return false;
+		if (chandef->center_freq2)
+			return false;
+		break;
+	default:
+		return false;
+	}
+
+	return true;
+}
+
+static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
+				  int *pri40, int *pri80)
+{
+	int tmp;
+
+	switch (c->width) {
+	case NL80211_CHAN_WIDTH_40:
+		*pri40 = c->center_freq1;
+		*pri80 = 0;
+		break;
+	case NL80211_CHAN_WIDTH_80:
+	case NL80211_CHAN_WIDTH_80P80:
+		*pri80 = c->center_freq1;
+		/* n_P20 */
+		tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
+		/* n_P40 */
+		tmp /= 2;
+		/* freq_P40 */
+		*pri40 = c->center_freq1 - 20 + 40 * tmp;
+		break;
+	case NL80211_CHAN_WIDTH_160:
+		/* n_P20 */
+		tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
+		/* n_P40 */
+		tmp /= 2;
+		/* freq_P40 */
+		*pri40 = c->center_freq1 - 60 + 40 * tmp;
+		/* n_P80 */
+		tmp /= 2;
+		*pri80 = c->center_freq1 - 40 + 80 * tmp;
+		break;
+	default:
+		WARN_ON_ONCE(1);
+	}
+}
+
+const struct cfg80211_chan_def *
+cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
+			    const struct cfg80211_chan_def *c2)
+{
+	u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80;
+
+	/* If they are identical, return */
+	if (cfg80211_chandef_identical(c1, c2))
+		return c1;
+
+	/* otherwise, must have same control channel */
+	if (c1->chan != c2->chan)
+		return NULL;
+
+	/*
+	 * If they have the same width, but aren't identical,
+	 * then they can't be compatible.
+	 */
+	if (c1->width == c2->width)
+		return NULL;
+
+	if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
+	    c1->width == NL80211_CHAN_WIDTH_20)
+		return c2;
+
+	if (c2->width == NL80211_CHAN_WIDTH_20_NOHT ||
+	    c2->width == NL80211_CHAN_WIDTH_20)
+		return c1;
+
+	chandef_primary_freqs(c1, &c1_pri40, &c1_pri80);
+	chandef_primary_freqs(c2, &c2_pri40, &c2_pri80);
+
+	if (c1_pri40 != c2_pri40)
+		return NULL;
+
+	WARN_ON(!c1_pri80 && !c2_pri80);
+	if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80)
+		return NULL;
+
+	if (c1->width > c2->width)
+		return c1;
+	return c2;
+}
+EXPORT_SYMBOL(cfg80211_chandef_compatible);
+
+bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
+				 u32 center_freq, u32 bandwidth,
+				 u32 prohibited_flags)
+{
+	struct ieee80211_channel *c;
+	u32 freq;
+
+	for (freq = center_freq - bandwidth/2 + 10;
+	     freq <= center_freq + bandwidth/2 - 10;
+	     freq += 20) {
+		c = ieee80211_get_channel(wiphy, freq);
+		if (!c || c->flags & prohibited_flags)
+			return false;
+	}
+
+	return true;
+}
+
+static bool cfg80211_check_beacon_chans(struct wiphy *wiphy,
+					u32 center_freq, u32 bw)
+{
+	return cfg80211_secondary_chans_ok(wiphy, center_freq, bw,
+					   IEEE80211_CHAN_DISABLED |
+					   IEEE80211_CHAN_PASSIVE_SCAN |
+					   IEEE80211_CHAN_NO_IBSS |
+					   IEEE80211_CHAN_RADAR);
+}
+
 bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
 			     struct cfg80211_chan_def *chandef)
 {
-	struct ieee80211_channel *sec_chan;
-	int diff;
+	u32 width;
+	bool res;
 
 	trace_cfg80211_reg_can_beacon(wiphy, chandef);
 
-	switch (chandef->_type) {
-	case NL80211_CHAN_HT40PLUS:
-		diff = 20;
+	if (WARN_ON(!cfg80211_chan_def_valid(chandef))) {
+		trace_cfg80211_return_bool(false);
+		return false;
+	}
+
+	switch (chandef->width) {
+	case NL80211_CHAN_WIDTH_20_NOHT:
+	case NL80211_CHAN_WIDTH_20:
+		width = 20;
 		break;
-	case NL80211_CHAN_HT40MINUS:
-		diff = -20;
+	case NL80211_CHAN_WIDTH_40:
+		width = 40;
+		break;
+	case NL80211_CHAN_WIDTH_80:
+	case NL80211_CHAN_WIDTH_80P80:
+		width = 80;
+		break;
+	case NL80211_CHAN_WIDTH_160:
+		width = 160;
 		break;
 	default:
-		trace_cfg80211_return_bool(true);
-		return true;
-	}
-
-	sec_chan = ieee80211_get_channel(wiphy,
-					 chandef->chan->center_freq + diff);
-	if (!sec_chan) {
+		WARN_ON_ONCE(1);
 		trace_cfg80211_return_bool(false);
 		return false;
 	}
 
-	/* we'll need a DFS capability later */
-	if (sec_chan->flags & (IEEE80211_CHAN_DISABLED |
-			       IEEE80211_CHAN_PASSIVE_SCAN |
-			       IEEE80211_CHAN_NO_IBSS |
-			       IEEE80211_CHAN_RADAR)) {
-		trace_cfg80211_return_bool(false);
-		return false;
-	}
-	trace_cfg80211_return_bool(true);
-	return true;
+	res = cfg80211_check_beacon_chans(wiphy, chandef->center_freq1, width);
+
+	if (res && chandef->center_freq2)
+		res = cfg80211_check_beacon_chans(wiphy, chandef->center_freq2,
+						  width);
+
+	trace_cfg80211_return_bool(res);
+	return res;
 }
 EXPORT_SYMBOL(cfg80211_reg_can_beacon);
 
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 6183a0d25b8..a0c8decf6a4 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -483,6 +483,12 @@ int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
 			       enum nl80211_iftype iftype, int num);
 
+bool cfg80211_chan_def_valid(const struct cfg80211_chan_def *chandef);
+
+bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
+				 u32 center_freq, u32 bandwidth,
+				 u32 prohibited_flags);
+
 #define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10
 
 #ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
diff --git a/net/wireless/ibss.c b/net/wireless/ibss.c
index ccc8865dfad..9b9551e4a6f 100644
--- a/net/wireless/ibss.c
+++ b/net/wireless/ibss.c
@@ -252,7 +252,7 @@ int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
 
 	/* try to find an IBSS channel if none requested ... */
 	if (!wdev->wext.ibss.chandef.chan) {
-		wdev->wext.ibss.chandef._type = NL80211_CHAN_NO_HT;
+		wdev->wext.ibss.chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 
 		for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 			struct ieee80211_supported_band *sband;
@@ -352,7 +352,7 @@ int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 
 	if (chan) {
 		wdev->wext.ibss.chandef.chan = chan;
-		wdev->wext.ibss.chandef._type = NL80211_CHAN_NO_HT;
+		wdev->wext.ibss.chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 		wdev->wext.ibss.channel_fixed = true;
 	} else {
 		/* cfg80211_ibss_wext_join will pick one if needed */
diff --git a/net/wireless/mesh.c b/net/wireless/mesh.c
index 12b5a570a30..3ee5a728228 100644
--- a/net/wireless/mesh.c
+++ b/net/wireless/mesh.c
@@ -146,7 +146,7 @@ int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 		if (!setup->chandef.chan)
 			return -EINVAL;
 
-		setup->chandef._type = NL80211_CHAN_NO_HT;
+		setup->chandef.width = NL80211_CHAN_WIDTH_20_NOHT;;
 	}
 
 	if (!cfg80211_reg_can_beacon(&rdev->wiphy, &setup->chandef))
@@ -198,7 +198,7 @@ int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
 	 * compatible with 802.11 mesh.
 	 */
 	if (rdev->ops->libertas_set_mesh_channel) {
-		if (chandef->_type != NL80211_CHAN_NO_HT)
+		if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
 			return -EINVAL;
 
 		if (!netif_running(wdev->netdev))
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 999108cd947..15158a3d64a 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -223,8 +223,13 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
 	[NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
 				      .len = 20-1 },
 	[NL80211_ATTR_WIPHY_TXQ_PARAMS] = { .type = NLA_NESTED },
+
 	[NL80211_ATTR_WIPHY_FREQ] = { .type = NLA_U32 },
 	[NL80211_ATTR_WIPHY_CHANNEL_TYPE] = { .type = NLA_U32 },
+	[NL80211_ATTR_CHANNEL_WIDTH] = { .type = NLA_U32 },
+	[NL80211_ATTR_CENTER_FREQ1] = { .type = NLA_U32 },
+	[NL80211_ATTR_CENTER_FREQ2] = { .type = NLA_U32 },
+
 	[NL80211_ATTR_WIPHY_RETRY_SHORT] = { .type = NLA_U8 },
 	[NL80211_ATTR_WIPHY_RETRY_LONG] = { .type = NLA_U8 },
 	[NL80211_ATTR_WIPHY_FRAG_THRESHOLD] = { .type = NLA_U32 },
@@ -1360,35 +1365,13 @@ static bool nl80211_can_set_dev_channel(struct wireless_dev *wdev)
 		wdev->iftype == NL80211_IFTYPE_P2P_GO;
 }
 
-static bool nl80211_valid_channel_type(struct genl_info *info,
-				       enum nl80211_channel_type *channel_type)
-{
-	enum nl80211_channel_type tmp;
-
-	if (!info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE])
-		return false;
-
-	tmp = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
-	if (tmp != NL80211_CHAN_NO_HT &&
-	    tmp != NL80211_CHAN_HT20 &&
-	    tmp != NL80211_CHAN_HT40PLUS &&
-	    tmp != NL80211_CHAN_HT40MINUS)
-		return false;
-
-	if (channel_type)
-		*channel_type = tmp;
-
-	return true;
-}
-
 static int nl80211_parse_chandef(struct cfg80211_registered_device *rdev,
 				 struct genl_info *info,
 				 struct cfg80211_chan_def *chandef)
 {
 	struct ieee80211_sta_ht_cap *ht_cap;
-	struct ieee80211_channel *sc;
-	u32 control_freq;
-	int offs;
+	struct ieee80211_sta_vht_cap *vht_cap;
+	u32 control_freq, width;
 
 	if (!info->attrs[NL80211_ATTR_WIPHY_FREQ])
 		return -EINVAL;
@@ -1396,47 +1379,105 @@ static int nl80211_parse_chandef(struct cfg80211_registered_device *rdev,
 	control_freq = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]);
 
 	chandef->chan = ieee80211_get_channel(&rdev->wiphy, control_freq);
-	chandef->_type = NL80211_CHAN_NO_HT;
-
-	if (info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE] &&
-	    !nl80211_valid_channel_type(info, &chandef->_type))
-		return -EINVAL;
+	chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
+	chandef->center_freq1 = control_freq;
+	chandef->center_freq2 = 0;
 
 	/* Primary channel not allowed */
 	if (!chandef->chan || chandef->chan->flags & IEEE80211_CHAN_DISABLED)
 		return -EINVAL;
 
-	ht_cap = &rdev->wiphy.bands[chandef->chan->band]->ht_cap;
+	if (info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE]) {
+		enum nl80211_channel_type chantype;
 
-	switch (chandef->_type) {
-	case NL80211_CHAN_NO_HT:
-		break;
-	case NL80211_CHAN_HT40MINUS:
-		if (chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
+		chantype = nla_get_u32(
+				info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
+
+		switch (chantype) {
+		case NL80211_CHAN_NO_HT:
+		case NL80211_CHAN_HT20:
+		case NL80211_CHAN_HT40PLUS:
+		case NL80211_CHAN_HT40MINUS:
+			cfg80211_chandef_create(chandef, chandef->chan,
+						chantype);
+			break;
+		default:
 			return -EINVAL;
-		offs = -20;
-		/* fall through */
-	case NL80211_CHAN_HT40PLUS:
-		if (chandef->_type == NL80211_CHAN_HT40PLUS) {
-			if (chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
-				return -EINVAL;
-			offs = 20;
 		}
+	} else if (info->attrs[NL80211_ATTR_CHANNEL_WIDTH]) {
+		chandef->width =
+			nla_get_u32(info->attrs[NL80211_ATTR_CHANNEL_WIDTH]);
+		if (info->attrs[NL80211_ATTR_CENTER_FREQ1])
+			chandef->center_freq1 =
+				nla_get_u32(
+					info->attrs[NL80211_ATTR_CENTER_FREQ1]);
+		if (info->attrs[NL80211_ATTR_CENTER_FREQ2])
+			chandef->center_freq2 =
+				nla_get_u32(
+					info->attrs[NL80211_ATTR_CENTER_FREQ2]);
+	}
+
+	ht_cap = &rdev->wiphy.bands[chandef->chan->band]->ht_cap;
+	vht_cap = &rdev->wiphy.bands[chandef->chan->band]->vht_cap;
+
+	if (!cfg80211_chan_def_valid(chandef))
+		return -EINVAL;
+
+	switch (chandef->width) {
+	case NL80211_CHAN_WIDTH_20:
+		if (!ht_cap->ht_supported)
+			return -EINVAL;
+	case NL80211_CHAN_WIDTH_20_NOHT:
+		width = 20;
+		break;
+	case NL80211_CHAN_WIDTH_40:
+		width = 40;
+		/* quick early regulatory check */
+		if (chandef->center_freq1 < control_freq &&
+		    chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
+			return -EINVAL;
+		if (chandef->center_freq1 > control_freq &&
+		    chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
+			return -EINVAL;
+		if (!ht_cap->ht_supported)
+			return -EINVAL;
 		if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
 		    ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
 			return -EINVAL;
-
-		sc = ieee80211_get_channel(&rdev->wiphy,
-					   chandef->chan->center_freq + offs);
-		if (!sc || sc->flags & IEEE80211_CHAN_DISABLED)
-			return -EINVAL;
-		/* fall through */
-	case NL80211_CHAN_HT20:
-		if (!ht_cap->ht_supported)
+		break;
+	case NL80211_CHAN_WIDTH_80:
+		width = 80;
+		if (!vht_cap->vht_supported)
 			return -EINVAL;
 		break;
+	case NL80211_CHAN_WIDTH_80P80:
+		width = 80;
+		if (!vht_cap->vht_supported)
+			return -EINVAL;
+		if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ))
+			return -EINVAL;
+		break;
+	case NL80211_CHAN_WIDTH_160:
+		width = 160;
+		if (!vht_cap->vht_supported)
+			return -EINVAL;
+		if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ))
+			return -EINVAL;
+		break;
+	default:
+		return -EINVAL;
 	}
 
+	if (!cfg80211_secondary_chans_ok(&rdev->wiphy, chandef->center_freq1,
+					 width, IEEE80211_CHAN_DISABLED))
+		return -EINVAL;
+	if (chandef->center_freq2 &&
+	    !cfg80211_secondary_chans_ok(&rdev->wiphy, chandef->center_freq2,
+					 width, IEEE80211_CHAN_DISABLED))
+		return -EINVAL;
+
+	/* TODO: missing regulatory check on bandwidth */
+
 	return 0;
 }
 
@@ -1800,10 +1841,28 @@ static inline u64 wdev_id(struct wireless_dev *wdev)
 static int nl80211_send_chandef(struct sk_buff *msg,
 				 struct cfg80211_chan_def *chandef)
 {
+	WARN_ON(!cfg80211_chan_def_valid(chandef));
+
 	if (nla_put_u32(msg, NL80211_ATTR_WIPHY_FREQ,
 			chandef->chan->center_freq))
 		return -ENOBUFS;
-	if (nla_put_u32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE, chandef->_type))
+	switch (chandef->width) {
+	case NL80211_CHAN_WIDTH_20_NOHT:
+	case NL80211_CHAN_WIDTH_20:
+	case NL80211_CHAN_WIDTH_40:
+		if (nla_put_u32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE,
+				cfg80211_get_chandef_type(chandef)))
+			return -ENOBUFS;
+		break;
+	default:
+		break;
+	}
+	if (nla_put_u32(msg, NL80211_ATTR_CHANNEL_WIDTH, chandef->width))
+		return -ENOBUFS;
+	if (nla_put_u32(msg, NL80211_ATTR_CENTER_FREQ1, chandef->center_freq1))
+		return -ENOBUFS;
+	if (chandef->center_freq2 &&
+	    nla_put_u32(msg, NL80211_ATTR_CENTER_FREQ2, chandef->center_freq2))
 		return -ENOBUFS;
 	return 0;
 }
@@ -5447,7 +5506,8 @@ static int nl80211_join_ibss(struct sk_buff *skb, struct genl_info *info)
 		if (IS_ERR(connkeys))
 			return PTR_ERR(connkeys);
 
-		if ((ibss.chandef._type != NL80211_CHAN_NO_HT) && no_ht) {
+		if ((ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT) &&
+		    no_ht) {
 			kfree(connkeys);
 			return -EINVAL;
 		}
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index 1370d52b139..3c7aa122156 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -126,25 +126,33 @@
 #define CHAN_PR_FMT ", band: %d, freq: %u"
 #define CHAN_PR_ARG __entry->band, __entry->center_freq
 
-#define CHAN_DEF_ENTRY __field(enum ieee80211_band, band)	\
-		       __field(u16, center_freq)		\
-		       __field(u32, channel_type)
+#define CHAN_DEF_ENTRY __field(enum ieee80211_band, band)		\
+		       __field(u32, control_freq)			\
+		       __field(u32, width)				\
+		       __field(u32, center_freq1)			\
+		       __field(u32, center_freq2)
 #define CHAN_DEF_ASSIGN(chandef)					\
 	do {								\
 		if ((chandef) && (chandef)->chan) {			\
 			__entry->band = (chandef)->chan->band;		\
-			__entry->center_freq =				\
+			__entry->control_freq =				\
 				(chandef)->chan->center_freq;		\
-			__entry->channel_type = (chandef)->_type;	\
+			__entry->width = (chandef)->width;		\
+			__entry->center_freq1 = (chandef)->center_freq1;\
+			__entry->center_freq2 = (chandef)->center_freq2;\
 		} else {						\
 			__entry->band = 0;				\
-			__entry->center_freq = 0;			\
-			__entry->channel_type = 0;			\
+			__entry->control_freq = 0;			\
+			__entry->width = 0;				\
+			__entry->center_freq1 = 0;			\
+			__entry->center_freq2 = 0;			\
 		}							\
 	} while (0)
-#define CHAN_DEF_PR_FMT ", band: %d, freq: %u, chantype: %d"
-#define CHAN_DEF_PR_ARG __entry->band, __entry->center_freq,		\
-			__entry->channel_type
+#define CHAN_DEF_PR_FMT							\
+	", band: %d, control freq: %u, width: %d, cf1: %u, cf2: %u"
+#define CHAN_DEF_PR_ARG __entry->band, __entry->control_freq,		\
+			__entry->width, __entry->center_freq1,		\
+			__entry->center_freq2
 
 #define SINFO_ENTRY __field(int, generation)	    \
 		    __field(u32, connected_time)    \
diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c
index da3307f3236..f9680c9cf9b 100644
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -785,7 +785,7 @@ static int cfg80211_wext_siwfreq(struct net_device *dev,
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 	struct cfg80211_chan_def chandef = {
-		._type = NL80211_CHAN_NO_HT,
+		.width = NL80211_CHAN_WIDTH_20_NOHT,
 	};
 	int freq, err;
 
@@ -800,6 +800,7 @@ static int cfg80211_wext_siwfreq(struct net_device *dev,
 			return freq;
 		if (freq == 0)
 			return -EINVAL;
+		chandef.center_freq1 = freq;
 		chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);
 		if (!chandef.chan)
 			return -EINVAL;
@@ -813,6 +814,7 @@ static int cfg80211_wext_siwfreq(struct net_device *dev,
 			return freq;
 		if (freq == 0)
 			return -EINVAL;
+		chandef.center_freq1 = freq;
 		chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);
 		if (!chandef.chan)
 			return -EINVAL;
diff --git a/net/wireless/wext-sme.c b/net/wireless/wext-sme.c
index e6e5dbf2f61..873af63187c 100644
--- a/net/wireless/wext-sme.c
+++ b/net/wireless/wext-sme.c
@@ -120,7 +120,8 @@ int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
 	 */
 	if (chan && !wdev->wext.connect.ssid_len) {
 		struct cfg80211_chan_def chandef = {
-			._type = NL80211_CHAN_NO_HT,
+			.width = NL80211_CHAN_WIDTH_20_NOHT,
+			.center_freq1 = freq,
 		};
 
 		chandef.chan = ieee80211_get_channel(&rdev->wiphy, freq);