--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
-@@ -587,6 +587,7 @@ struct ath_softc {
+@@ -591,6 +591,7 @@ struct ath_softc {
struct ieee80211_hw *hw;
struct device *dev;
int chan_idx;
int chan_is_ht;
struct survey_info *cur_survey;
+@@ -654,6 +655,7 @@ struct ath_softc {
+ u8 ant_tx, ant_rx;
+ };
+
++int ath9k_config(struct ieee80211_hw *hw, u32 changed);
+ void ath9k_tasklet(unsigned long data);
+ int ath_cabq_update(struct ath_softc *);
+
--- 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)
+@@ -1663,6 +1663,50 @@ static const struct file_operations fops
+ .owner = THIS_MODULE
+ };
+
++
++static ssize_t read_file_chan_bw(struct file *file, char __user *user_buf,
++ size_t count, loff_t *ppos)
++{
++ struct ath_softc *sc = file->private_data;
++ char buf[32];
++ unsigned int len;
++
++ len = sprintf(buf, "0x%08x\n", sc->chan_bw);
++ return simple_read_from_buffer(user_buf, count, ppos, buf, len);
++}
++
++static ssize_t write_file_chan_bw(struct file *file, const char __user *user_buf,
++ size_t count, loff_t *ppos)
++{
++ struct ath_softc *sc = file->private_data;
++ unsigned long chan_bw;
++ char buf[32];
++ ssize_t len;
++
++ len = min(count, sizeof(buf) - 1);
++ if (copy_from_user(buf, user_buf, len))
++ return -EFAULT;
++
++ buf[len] = '\0';
++ if (strict_strtoul(buf, 0, &chan_bw))
++ return -EINVAL;
++
++ sc->chan_bw = chan_bw;
++ if (!sc->ps_idle)
++ ath9k_config(sc->hw, IEEE80211_CONF_CHANGE_CHANNEL);
++
++ return count;
++}
++
++static const struct file_operations fops_chanbw = {
++ .read = read_file_chan_bw,
++ .write = write_file_chan_bw,
++ .open = ath9k_debugfs_open,
++ .owner = THIS_MODULE,
++ .llseek = default_llseek,
++};
++
++
+ int ath9k_init_debug(struct ath_hw *ah)
+ {
+ struct ath_common *common = ath9k_hw_common(ah);
+@@ -1724,6 +1768,9 @@ 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);
++ debugfs_create_file("chanbw", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
++ sc, &fops_chanbw);
+
sc->debug.regidx = 0;
- return 0;
- }
+ memset(&sc->debug.bb_mac_samp, 0, sizeof(sc->debug.bb_mac_samp));
+ sc->debug.sampidx = 0;
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
-@@ -226,6 +226,7 @@ static int ath_set_channel(struct ath_so
- bool fastcc = true, stopped;
- struct ieee80211_channel *channel = hw->conf.channel;
- struct ath9k_hw_cal_data *caldata = NULL;
-+ u32 oldflags;
- int r;
-
- if (sc->sc_flags & SC_OP_INVALID)
-@@ -268,6 +269,24 @@ static int ath_set_channel(struct ath_so
- if (!stopped || !(sc->sc_flags & SC_OP_OFFCHANNEL))
- fastcc = false;
-
-+ 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 (oldflags != hchan->channelFlags)
-+ fastcc = false;
-+
- if (!(sc->sc_flags & SC_OP_OFFCHANNEL))
- caldata = &sc->caldata;
+@@ -1554,7 +1554,7 @@ static void ath9k_disable_ps(struct ath_
+
+ }
+
+-static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
++int ath9k_config(struct ieee80211_hw *hw, u32 changed)
+ {
+ struct ath_softc *sc = hw->priv;
+ struct ath_hw *ah = sc->sc_ah;
+@@ -1606,9 +1606,10 @@ 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)
+@@ -1661,7 +1662,23 @@ 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
+@@ -1549,6 +1549,10 @@ int ath9k_hw_reset(struct ath_hw *ah, st
+ caldata->rtt_hist.num_readings)
+ allow_fbs = true;
+
++ if (!ah->curchan || ((ah->curchan->channelFlags ^ chan->channelFlags) &
++ (CHANNEL_HALF | CHANNEL_QUARTER)))
++ bChannelChange = false;
++
+ if (bChannelChange &&
+ (ah->chip_fullsleep != true) &&
+ (ah->curchan != NULL) &&
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