2 files changed, 16 insertions, 4 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
index 0ca7635d0669..ff8150e46f0e 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
@@ -4645,10 +4645,16 @@ static void ar9003_hw_set_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;
         }
 
diff --git a/drivers/net/wireless/ath/ath9k/eeprom_9287.c b/drivers/net/wireless/ath/ath9k/eeprom_9287.c
index 7856f0d4512d..343fc9f946db 100644
--- a/drivers/net/wireless/ath/ath9k/eeprom_9287.c
+++ b/drivers/net/wireless/ath/ath9k/eeprom_9287.c
@@ -524,10 +524,16 @@ static void ath9k_hw_set_ar9287_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);