--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -587,6 +587,7 @@ struct ath_softc {
 	struct ieee80211_hw *hw;
 	struct device *dev;
 
+	u32 chan_bw;
 	int chan_idx;
 	int chan_is_ht;
 	struct survey_info *cur_survey;
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -1378,6 +1378,9 @@ int ath9k_init_debug(struct ath_hw *ah)
 	debugfs_create_file("eeprom", S_IRUSR, sc->debug.debugfs_phy, sc,
 			    &fops_eeprom);
 
+	debugfs_create_u32("chanbw", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
+			   &sc->chan_bw);
+
 	sc->debug.regidx = 0;
 	return 0;
 }
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1654,9 +1654,10 @@ static int ath9k_config(struct ieee80211
 
 	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 		struct ieee80211_channel *curchan = hw->conf.channel;
-		struct ath9k_channel old_chan;
+		struct ath9k_channel old_chan, *hchan;
 		int pos = curchan->hw_value;
 		int old_pos = -1;
+		u32 oldflags;
 		unsigned long flags;
 
 		if (ah->curchan)
@@ -1709,7 +1710,23 @@ static int ath9k_config(struct ieee80211
 			memset(&sc->survey[pos], 0, sizeof(struct survey_info));
 		}
 
-		if (ath_set_channel(sc, hw, &sc->sc_ah->channels[pos]) < 0) {
+		hchan = &sc->sc_ah->channels[pos];
+		oldflags = hchan->channelFlags;
+		switch (sc->chan_bw) {
+		case 5:
+			hchan->channelFlags &= ~CHANNEL_HALF;
+			hchan->channelFlags |= CHANNEL_QUARTER;
+			break;
+		case 10:
+			hchan->channelFlags &= ~CHANNEL_QUARTER;
+			hchan->channelFlags |= CHANNEL_HALF;
+			break;
+		default:
+			hchan->channelFlags &= ~(CHANNEL_HALF | CHANNEL_QUARTER);
+			break;
+		}
+
+		if (ath_set_channel(sc, hw, hchan) < 0) {
 			ath_err(common, "Unable to set channel\n");
 			mutex_unlock(&sc->mutex);
 			return -EINVAL;
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1507,6 +1507,10 @@ int ath9k_hw_reset(struct ath_hw *ah, st
 	}
 	ah->noise = ath9k_hw_getchan_noise(ah, chan);
 
+	if (!ah->curchan || ((ah->curchan->channelFlags ^ chan->channelFlags) &
+	    (CHANNEL_HALF | CHANNEL_QUARTER)))
+		bChannelChange = false;
+
 	if (bChannelChange &&
 	    (ah->chip_fullsleep != true) &&
 	    (ah->curchan != NULL) &&