--- a/drivers/net/wireless/ath/ath9k/ani.h
+++ b/drivers/net/wireless/ath/ath9k/ani.h
@@ -20,8 +20,12 @@
 #define BEACON_RSSI(ahp) (ahp->stats.avgbrssi)
 
 /* units are errors per second */
-#define ATH9K_ANI_OFDM_TRIG_HIGH          1000
+#define ATH9K_ANI_OFDM_TRIG_HIGH          3500
+#define ATH9K_ANI_OFDM_TRIG_HIGH_BELOW_INI 1000
+
 #define ATH9K_ANI_OFDM_TRIG_LOW           400
+#define ATH9K_ANI_OFDM_TRIG_LOW_ABOVE_INI 900
+
 #define ATH9K_ANI_CCK_TRIG_HIGH           600
 #define ATH9K_ANI_CCK_TRIG_LOW            300
 
--- a/drivers/net/wireless/ath/ath9k/ani.c
+++ b/drivers/net/wireless/ath/ath9k/ani.c
@@ -177,14 +177,17 @@ static void ath9k_hw_set_ofdm_nil(struct
 	    BEACON_RSSI(ah) <= ATH9K_ANI_RSSI_THR_HIGH)
 		weak_sig = true;
 
-	/*
-	 * OFDM Weak signal detection is always enabled for AP mode.
-	 */
-	if (ah->opmode != NL80211_IFTYPE_AP &&
-	    aniState->ofdmWeakSigDetect != weak_sig) {
-		ath9k_hw_ani_control(ah,
-				     ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
-				     entry_ofdm->ofdm_weak_signal_on);
+	if (aniState->ofdmWeakSigDetect != weak_sig)
+			ath9k_hw_ani_control(ah,
+				ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
+				entry_ofdm->ofdm_weak_signal_on);
+
+	if (aniState->ofdmNoiseImmunityLevel >= ATH9K_ANI_OFDM_DEF_LEVEL) {
+		ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH;
+		ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW_ABOVE_INI;
+	} else {
+		ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH_BELOW_INI;
+		ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW;
 	}
 }
 
@@ -420,25 +423,12 @@ void ath9k_hw_ani_monitor(struct ath_hw 
 		ofdmPhyErrRate, aniState->cckNoiseImmunityLevel,
 		cckPhyErrRate, aniState->ofdmsTurn);
 
-	if (aniState->listenTime > 5 * ah->aniperiod) {
-		/*
-		 * Check if we need to lower immunity if
-		 * 5 ani_periods have passed.
-		 */
-		if (ofdmPhyErrRate <= ah->config.ofdm_trig_low &&
-		    cckPhyErrRate <= ah->config.cck_trig_low) {
+	if (aniState->listenTime > ah->aniperiod) {
+		if (cckPhyErrRate < ah->config.cck_trig_low &&
+		    ofdmPhyErrRate < ah->config.ofdm_trig_low) {
 			ath9k_hw_ani_lower_immunity(ah);
 			aniState->ofdmsTurn = !aniState->ofdmsTurn;
-		}
-		ath9k_ani_restart(ah);
-	} else if (aniState->listenTime > ah->aniperiod) {
-		/*
-		 * Check if immunity has to be raised,
-		 * (either OFDM or CCK).
-		 */
-		if (ofdmPhyErrRate > ah->config.ofdm_trig_high &&
-		    (cckPhyErrRate <= ah->config.cck_trig_high ||
-		     aniState->ofdmsTurn)) {
+		} else if (ofdmPhyErrRate > ah->config.ofdm_trig_high) {
 			ath9k_hw_ani_ofdm_err_trigger(ah);
 			aniState->ofdmsTurn = false;
 		} else if (cckPhyErrRate > ah->config.cck_trig_high) {