ath9k_hw: Read iq calibration data only for active chains

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ar9003_calib.c

@@ -185,6 +185,7 @@ static void ar9003_hw_iqcal_collect(struct ath_hw *ah)
 
 	/* Accumulate IQ cal measures for active chains */
 	for (i = 0; i < AR5416_MAX_CHAINS; i++) {
+		if (ah->txchainmask & BIT(i)) {
 			ah->totalPowerMeasI[i] +=
 				REG_READ(ah, AR_PHY_CAL_MEAS_0(i));
 			ah->totalPowerMeasQ[i] +=
@@ -197,6 +198,7 @@ static void ar9003_hw_iqcal_collect(struct ath_hw *ah)
 				ah->totalPowerMeasQ[i],
 				ah->totalIqCorrMeas[i]);
 		}
+	}
 }
 
 static void ar9003_hw_iqcalibrate(struct ath_hw *ah, u8 numChains)