--- a/drivers/net/wireless/ath/ath.h
+++ b/drivers/net/wireless/ath/ath.h
@@ -145,6 +145,8 @@ struct ath_common {
 	DECLARE_BITMAP(tkip_keymap, ATH_KEYMAX);
 	enum ath_crypt_caps crypt_caps;
 
+	unsigned int clockrate;
+
 	struct ath_regulatory regulatory;
 	const struct ath_ops *ops;
 	const struct ath_bus_ops *bus_ops;
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -91,29 +91,32 @@ static void ath9k_hw_ani_cache_ini_regs(
 /* Helper Functions */
 /********************/
 
-static u32 ath9k_hw_mac_clks(struct ath_hw *ah, u32 usecs)
+static void ath9k_hw_set_clockrate(struct ath_hw *ah)
 {
 	struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
+	struct ath_common *common = ath9k_hw_common(ah);
+	unsigned int clockrate;
 
 	if (!ah->curchan) /* should really check for CCK instead */
-		return usecs *ATH9K_CLOCK_RATE_CCK;
-	if (conf->channel->band == IEEE80211_BAND_2GHZ)
-		return usecs *ATH9K_CLOCK_RATE_2GHZ_OFDM;
-
-	if (ah->caps.hw_caps & ATH9K_HW_CAP_FASTCLOCK)
-		return usecs * ATH9K_CLOCK_FAST_RATE_5GHZ_OFDM;
+		clockrate = ATH9K_CLOCK_RATE_CCK;
+	else if (conf->channel->band == IEEE80211_BAND_2GHZ)
+		clockrate = ATH9K_CLOCK_RATE_2GHZ_OFDM;
+	else if (ah->caps.hw_caps & ATH9K_HW_CAP_FASTCLOCK)
+		clockrate = ATH9K_CLOCK_FAST_RATE_5GHZ_OFDM;
 	else
-		return usecs * ATH9K_CLOCK_RATE_5GHZ_OFDM;
+		clockrate = ATH9K_CLOCK_RATE_5GHZ_OFDM;
+
+	if (conf_is_ht40(conf))
+		clockrate *= 2;
+
+	common->clockrate = clockrate;
 }
 
 static u32 ath9k_hw_mac_to_clks(struct ath_hw *ah, u32 usecs)
 {
-	struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
+	struct ath_common *common = ath9k_hw_common(ah);
 
-	if (conf_is_ht40(conf))
-		return ath9k_hw_mac_clks(ah, usecs) * 2;
-	else
-		return ath9k_hw_mac_clks(ah, usecs);
+	return usecs * common->clockrate;
 }
 
 bool ath9k_hw_wait(struct ath_hw *ah, u32 reg, u32 mask, u32 val, u32 timeout)
@@ -1168,6 +1171,7 @@ static bool ath9k_hw_channel_change(stru
 			  "Failed to set channel\n");
 		return false;
 	}
+	ath9k_hw_set_clockrate(ah);
 
 	ah->eep_ops->set_txpower(ah, chan,
 			     ath9k_regd_get_ctl(regulatory, chan),
@@ -1380,6 +1384,8 @@ int ath9k_hw_reset(struct ath_hw *ah, st
 	if (r)
 		return r;
 
+	ath9k_hw_set_clockrate(ah);
+
 	ENABLE_REGWRITE_BUFFER(ah);
 
 	for (i = 0; i < AR_NUM_DCU; i++)
--- a/drivers/net/wireless/ath/ath9k/ani.c
+++ b/drivers/net/wireless/ath/ath9k/ani.c
@@ -465,35 +465,13 @@ static void ath9k_hw_ani_lower_immunity(
 		ath9k_hw_set_cck_nil(ah, aniState->cckNoiseImmunityLevel - 1);
 }
 
-static u8 ath9k_hw_chan_2_clockrate_mhz(struct ath_hw *ah)
-{
-	struct ath9k_channel *chan = ah->curchan;
-	struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf;
-	u8 clockrate; /* in MHz */
-
-	if (!ah->curchan) /* should really check for CCK instead */
-		clockrate = ATH9K_CLOCK_RATE_CCK;
-	else if (conf->channel->band == IEEE80211_BAND_2GHZ)
-		clockrate = ATH9K_CLOCK_RATE_2GHZ_OFDM;
-	else if (IS_CHAN_A_FAST_CLOCK(ah, chan))
-		clockrate = ATH9K_CLOCK_FAST_RATE_5GHZ_OFDM;
-	else
-		clockrate = ATH9K_CLOCK_RATE_5GHZ_OFDM;
-
-	if (conf_is_ht40(conf))
-		return clockrate * 2;
-
-	return clockrate;
-}
-
 static int32_t ath9k_hw_ani_get_listen_time(struct ath_hw *ah)
 {
+	struct ath_common *common = ath9k_hw_common(ah);
 	int32_t listen_time;
-	int32_t clock_rate;
 
 	ath9k_hw_update_cycle_counters(ah);
-	clock_rate = ath9k_hw_chan_2_clockrate_mhz(ah) * 1000;
-	listen_time = ah->listen_time / clock_rate;
+	listen_time = ah->listen_time / (common->clockrate * 1000);
 	ah->listen_time = 0;
 
 	return listen_time;