diff --git a/drivers/net/ethernet/wangxun/txgbe/txgbe_hw.c b/drivers/net/ethernet/wangxun/txgbe/txgbe_hw.c
index 9cf5fe33118e..167f7ff73192 100644
--- a/drivers/net/ethernet/wangxun/txgbe/txgbe_hw.c
+++ b/drivers/net/ethernet/wangxun/txgbe/txgbe_hw.c
@@ -200,10 +200,11 @@ static int txgbe_calc_eeprom_checksum(struct txgbe_hw *hw, u16 *checksum)
 	if (eeprom_ptrs)
 		kvfree(eeprom_ptrs);
 
-	*checksum = TXGBE_EEPROM_SUM - *checksum;
-	if (*checksum < 0)
+	if (*checksum > TXGBE_EEPROM_SUM)
 		return -EINVAL;
 
+	*checksum = TXGBE_EEPROM_SUM - *checksum;
+
 	return 0;
 }