diff --git a/drivers/net/wireless/ath9k/ath9k.h b/drivers/net/wireless/ath9k/ath9k.h
index 1153374f94fb4147496e19bbcb209a629e0160e0..bc25075913ad7cc968e83732b4a4870440b41bd8 100644
--- a/drivers/net/wireless/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath9k/ath9k.h
@@ -563,6 +563,11 @@ struct ath_softc {
 	struct ath_wiphy **sec_wiphy; /* secondary wiphys (virtual radios); may
 				       * have NULL entries */
 	int num_sec_wiphy; /* number of sec_wiphy pointers in the array */
+	int chan_idx;
+	int chan_is_ht;
+	struct ath_wiphy *next_wiphy;
+	struct work_struct chan_work;
+
 	struct tasklet_struct intr_tq;
 	struct tasklet_struct bcon_tasklet;
 	struct ath_hw *sc_ah;
@@ -626,6 +631,8 @@ struct ath_wiphy {
 		ATH_WIPHY_PAUSING,
 		ATH_WIPHY_PAUSED,
 	} state;
+	int chan_idx;
+	int chan_is_ht;
 };
 
 int ath_reset(struct ath_softc *sc, bool retry_tx);
@@ -652,6 +659,11 @@ void ath_detach(struct ath_softc *sc);
 const char *ath_mac_bb_name(u32 mac_bb_version);
 const char *ath_rf_name(u16 rf_version);
 void ath_set_hw_capab(struct ath_softc *sc, struct ieee80211_hw *hw);
+void ath9k_update_ichannel(struct ath_softc *sc, struct ieee80211_hw *hw,
+			   struct ath9k_channel *ichan);
+void ath_update_chainmask(struct ath_softc *sc, int is_ht);
+int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw,
+		    struct ath9k_channel *hchan);
 
 #ifdef CONFIG_PCI
 int ath_pci_init(void);
@@ -694,5 +706,7 @@ int ath9k_wiphy_del(struct ath_wiphy *aphy);
 void ath9k_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb);
 int ath9k_wiphy_pause(struct ath_wiphy *aphy);
 int ath9k_wiphy_unpause(struct ath_wiphy *aphy);
+int ath9k_wiphy_select(struct ath_wiphy *aphy);
+void ath9k_wiphy_chan_work(struct work_struct *work);
 
 #endif /* ATH9K_H */
diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c
index 7e44013ba6e7108cea28f52396bcf72e9941db40..44959010c5478bece96a5e2706b476e2d2bcaf65 100644
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -236,11 +236,11 @@ static void ath_setup_rates(struct ath_softc *sc, enum ieee80211_band band)
  * by reseting the chip.  To accomplish this we must first cleanup any pending
  * DMA, then restart stuff.
 */
-static int ath_set_channel(struct ath_softc *sc, struct ath9k_channel *hchan)
+int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw,
+		    struct ath9k_channel *hchan)
 {
 	struct ath_hw *ah = sc->sc_ah;
 	bool fastcc = true, stopped;
-	struct ieee80211_hw *hw = sc->hw;
 	struct ieee80211_channel *channel = hw->conf.channel;
 	int r;
 
@@ -414,7 +414,7 @@ static void ath_ani_calibrate(unsigned long data)
  * the chainmask configuration, for bt coexistence, use
  * the chainmask configuration even in legacy mode.
  */
-static void ath_update_chainmask(struct ath_softc *sc, int is_ht)
+void ath_update_chainmask(struct ath_softc *sc, int is_ht)
 {
 	sc->sc_flags |= SC_OP_CHAINMASK_UPDATE;
 	if (is_ht ||
@@ -1324,6 +1324,7 @@ void ath_detach(struct ath_softc *sc)
 	ath_deinit_rfkill(sc);
 #endif
 	ath_deinit_leds(sc);
+	cancel_work_sync(&sc->chan_work);
 
 	for (i = 0; i < sc->num_sec_wiphy; i++) {
 		struct ath_wiphy *aphy = sc->sec_wiphy[i];
@@ -1669,6 +1670,8 @@ int ath_attach(u16 devid, struct ath_softc *sc)
 	ath9k_reg_apply_radar_flags(hw->wiphy);
 	ath9k_reg_apply_world_flags(hw->wiphy, REGDOM_SET_BY_INIT);
 
+	INIT_WORK(&sc->chan_work, ath9k_wiphy_chan_work);
+
 	error = ieee80211_register_hw(hw);
 
 	if (!ath9k_is_world_regd(sc->sc_ah)) {
@@ -1917,10 +1920,9 @@ int ath_get_mac80211_qnum(u32 queue, struct ath_softc *sc)
 
 /* XXX: Remove me once we don't depend on ath9k_channel for all
  * this redundant data */
-static void ath9k_update_ichannel(struct ath_softc *sc,
-			  struct ath9k_channel *ichan)
+void ath9k_update_ichannel(struct ath_softc *sc, struct ieee80211_hw *hw,
+			   struct ath9k_channel *ichan)
 {
-	struct ieee80211_hw *hw = sc->hw;
 	struct ieee80211_channel *chan = hw->conf.channel;
 	struct ieee80211_conf *conf = &hw->conf;
 
@@ -1967,8 +1969,9 @@ static int ath9k_start(struct ieee80211_hw *hw)
 
 	pos = curchan->hw_value;
 
+	sc->chan_idx = pos;
 	init_channel = &sc->sc_ah->channels[pos];
-	ath9k_update_ichannel(sc, init_channel);
+	ath9k_update_ichannel(sc, hw, init_channel);
 
 	/* Reset SERDES registers */
 	ath9k_hw_configpcipowersave(sc->sc_ah, 0);
@@ -2307,15 +2310,21 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
 		struct ieee80211_channel *curchan = hw->conf.channel;
 		int pos = curchan->hw_value;
 
+		aphy->chan_idx = pos;
+		aphy->chan_is_ht = conf_is_ht(conf);
+
+		/* TODO: do not change operation channel immediately if there
+		 * are other virtual wiphys that use another channel */
+
 		DPRINTF(sc, ATH_DBG_CONFIG, "Set channel: %d MHz\n",
 			curchan->center_freq);
 
 		/* XXX: remove me eventualy */
-		ath9k_update_ichannel(sc, &sc->sc_ah->channels[pos]);
+		ath9k_update_ichannel(sc, hw, &sc->sc_ah->channels[pos]);
 
 		ath_update_chainmask(sc, conf_is_ht(conf));
 
-		if (ath_set_channel(sc, &sc->sc_ah->channels[pos]) < 0) {
+		if (ath_set_channel(sc, hw, &sc->sc_ah->channels[pos]) < 0) {
 			DPRINTF(sc, ATH_DBG_FATAL, "Unable to set channel\n");
 			mutex_unlock(&sc->mutex);
 			return -EINVAL;
diff --git a/drivers/net/wireless/ath9k/virtual.c b/drivers/net/wireless/ath9k/virtual.c
index a8bac97bd84708084eb57468ef79d86989211033..76ffdfa860edc961a23b638e11078597e03fc2af 100644
--- a/drivers/net/wireless/ath9k/virtual.c
+++ b/drivers/net/wireless/ath9k/virtual.c
@@ -222,6 +222,81 @@ static int ath9k_send_nullfunc(struct ath_wiphy *aphy,
 	return -1;
 }
 
+static bool __ath9k_wiphy_pausing(struct ath_softc *sc)
+{
+	int i;
+	if (sc->pri_wiphy->state == ATH_WIPHY_PAUSING)
+		return true;
+	for (i = 0; i < sc->num_sec_wiphy; i++) {
+		if (sc->sec_wiphy[i] &&
+		    sc->sec_wiphy[i]->state == ATH_WIPHY_PAUSING)
+			return true;
+	}
+	return false;
+}
+
+static bool ath9k_wiphy_pausing(struct ath_softc *sc)
+{
+	bool ret;
+	spin_lock_bh(&sc->wiphy_lock);
+	ret = __ath9k_wiphy_pausing(sc);
+	spin_unlock_bh(&sc->wiphy_lock);
+	return ret;
+}
+
+static int __ath9k_wiphy_unpause(struct ath_wiphy *aphy);
+
+/* caller must hold wiphy_lock */
+static void __ath9k_wiphy_unpause_ch(struct ath_wiphy *aphy)
+{
+	if (aphy == NULL)
+		return;
+	if (aphy->chan_idx != aphy->sc->chan_idx)
+		return; /* wiphy not on the selected channel */
+	__ath9k_wiphy_unpause(aphy);
+}
+
+static void ath9k_wiphy_unpause_channel(struct ath_softc *sc)
+{
+	int i;
+	spin_lock_bh(&sc->wiphy_lock);
+	__ath9k_wiphy_unpause_ch(sc->pri_wiphy);
+	for (i = 0; i < sc->num_sec_wiphy; i++)
+		__ath9k_wiphy_unpause_ch(sc->sec_wiphy[i]);
+	spin_unlock_bh(&sc->wiphy_lock);
+}
+
+void ath9k_wiphy_chan_work(struct work_struct *work)
+{
+	struct ath_softc *sc = container_of(work, struct ath_softc, chan_work);
+	struct ath_wiphy *aphy = sc->next_wiphy;
+
+	if (aphy == NULL)
+		return;
+
+	/*
+	 * All pending interfaces paused; ready to change
+	 * channels.
+	 */
+
+	/* Change channels */
+	mutex_lock(&sc->mutex);
+	/* XXX: remove me eventually */
+	ath9k_update_ichannel(sc, aphy->hw,
+			      &sc->sc_ah->channels[sc->chan_idx]);
+	ath_update_chainmask(sc, sc->chan_is_ht);
+	if (ath_set_channel(sc, aphy->hw,
+			    &sc->sc_ah->channels[sc->chan_idx]) < 0) {
+		printk(KERN_DEBUG "ath9k: Failed to set channel for new "
+		       "virtual wiphy\n");
+		mutex_unlock(&sc->mutex);
+		return;
+	}
+	mutex_unlock(&sc->mutex);
+
+	ath9k_wiphy_unpause_channel(sc);
+}
+
 /*
  * ath9k version of ieee80211_tx_status() for TX frames that are generated
  * internally in the driver.
@@ -244,6 +319,14 @@ void ath9k_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 			 */
 		}
 		aphy->state = ATH_WIPHY_PAUSED;
+		if (!ath9k_wiphy_pausing(aphy->sc)) {
+			/*
+			 * Drop from tasklet to work to allow mutex for channel
+			 * change.
+			 */
+			queue_work(aphy->sc->hw->workqueue,
+				   &aphy->sc->chan_work);
+		}
 	}
 
 	kfree(tx_info_priv);
@@ -252,6 +335,14 @@ void ath9k_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 	dev_kfree_skb(skb);
 }
 
+static void ath9k_mark_paused(struct ath_wiphy *aphy)
+{
+	struct ath_softc *sc = aphy->sc;
+	aphy->state = ATH_WIPHY_PAUSED;
+	if (!__ath9k_wiphy_pausing(sc))
+		queue_work(sc->hw->workqueue, &sc->chan_work);
+}
+
 static void ath9k_pause_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
 {
 	struct ath_wiphy *aphy = data;
@@ -260,15 +351,19 @@ static void ath9k_pause_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
 	switch (vif->type) {
 	case NL80211_IFTYPE_STATION:
 		if (!vif->bss_conf.assoc) {
-			aphy->state = ATH_WIPHY_PAUSED;
+			ath9k_mark_paused(aphy);
 			break;
 		}
 		/* TODO: could avoid this if already in PS mode */
-		ath9k_send_nullfunc(aphy, vif, avp->bssid, 1);
+		if (ath9k_send_nullfunc(aphy, vif, avp->bssid, 1)) {
+			printk(KERN_DEBUG "%s: failed to send PS nullfunc\n",
+			       __func__);
+			ath9k_mark_paused(aphy);
+		}
 		break;
 	case NL80211_IFTYPE_AP:
 		/* Beacon transmission is paused by aphy->state change */
-		aphy->state = ATH_WIPHY_PAUSED;
+		ath9k_mark_paused(aphy);
 		break;
 	default:
 		break;
@@ -336,3 +431,49 @@ int ath9k_wiphy_unpause(struct ath_wiphy *aphy)
 	spin_unlock_bh(&aphy->sc->wiphy_lock);
 	return ret;
 }
+
+/* caller must hold wiphy_lock */
+static void __ath9k_wiphy_pause_all(struct ath_softc *sc)
+{
+	int i;
+	if (sc->pri_wiphy->state == ATH_WIPHY_ACTIVE)
+		__ath9k_wiphy_pause(sc->pri_wiphy);
+	for (i = 0; i < sc->num_sec_wiphy; i++) {
+		if (sc->sec_wiphy[i] &&
+		    sc->sec_wiphy[i]->state == ATH_WIPHY_ACTIVE)
+			__ath9k_wiphy_pause(sc->sec_wiphy[i]);
+	}
+}
+
+int ath9k_wiphy_select(struct ath_wiphy *aphy)
+{
+	struct ath_softc *sc = aphy->sc;
+	bool now;
+
+	spin_lock_bh(&sc->wiphy_lock);
+	if (__ath9k_wiphy_pausing(sc)) {
+		spin_unlock_bh(&sc->wiphy_lock);
+		return -EBUSY; /* previous select still in progress */
+	}
+
+	/* Store the new channel */
+	sc->chan_idx = aphy->chan_idx;
+	sc->chan_is_ht = aphy->chan_is_ht;
+	sc->next_wiphy = aphy;
+
+	__ath9k_wiphy_pause_all(sc);
+	now = !__ath9k_wiphy_pausing(aphy->sc);
+	spin_unlock_bh(&sc->wiphy_lock);
+
+	if (now) {
+		/* Ready to request channel change immediately */
+		queue_work(aphy->sc->hw->workqueue, &aphy->sc->chan_work);
+	}
+
+	/*
+	 * wiphys will be unpaused in ath9k_tx_status() once channel has been
+	 * changed if any wiphy needs time to become paused.
+	 */
+
+	return 0;
+}