diff --git a/drivers/net/wireless/ath/ath9k/eeprom_def.c b/drivers/net/wireless/ath/ath9k/eeprom_def.c
index 526d7c933f7fe56edf4fac310af8b5426e18e0b2..a3ccb1b9638d7b8b44f32ba651d519d042b806ec 100644
--- a/drivers/net/wireless/ath/ath9k/eeprom_def.c
+++ b/drivers/net/wireless/ath/ath9k/eeprom_def.c
@@ -1063,15 +1063,19 @@ static void ath9k_hw_set_def_power_per_rate_table(struct ath_hw *ah,
 	case 1:
 		break;
 	case 2:
-		scaledPower -= REDUCE_SCALED_POWER_BY_TWO_CHAIN;
+		if (scaledPower > REDUCE_SCALED_POWER_BY_TWO_CHAIN)
+			scaledPower -= REDUCE_SCALED_POWER_BY_TWO_CHAIN;
+		else
+			scaledPower = 0;
 		break;
 	case 3:
-		scaledPower -= REDUCE_SCALED_POWER_BY_THREE_CHAIN;
+		if (scaledPower > REDUCE_SCALED_POWER_BY_THREE_CHAIN)
+			scaledPower -= REDUCE_SCALED_POWER_BY_THREE_CHAIN;
+		else
+			scaledPower = 0;
 		break;
 	}
 
-	scaledPower = max((u16)0, scaledPower);
-
 	if (IS_CHAN_2GHZ(chan)) {
 		numCtlModes = ARRAY_SIZE(ctlModesFor11g) -
 			SUB_NUM_CTL_MODES_AT_2G_40;