linux-kernel - [PATCH] amd-xgbe: fix unsigned comparison against less than zero

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Date:   Tue, 15 Nov 2016 12:18:42 +0000
From:   Colin King <colin.king@...onical.com>
To:     Tom Lendacky <thomas.lendacky@....com>, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] amd-xgbe: fix unsigned comparison against less than zero

From: Colin Ian King <colin.king@...onical.com>

Comparing unsigned int ret to less than zero for an error status
check is never true.  Fix this by making ret a signed int. Reduce
scope of ret too.

Found with static analysis by CoverityScan, CID 1377750

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
index 4ba4332..168507e 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
@@ -2346,7 +2346,7 @@ static bool xgbe_phy_valid_speed(struct xgbe_prv_data *pdata, int speed)
 static int xgbe_phy_link_status(struct xgbe_prv_data *pdata, int *an_restart)
 {
 	struct xgbe_phy_data *phy_data = pdata->phy_data;
-	unsigned int ret, reg;
+	unsigned int reg;
 
 	*an_restart = 0;
 
@@ -2365,7 +2365,8 @@ static int xgbe_phy_link_status(struct xgbe_prv_data *pdata, int *an_restart)
 
 	if (phy_data->phydev) {
 		/* Check external PHY */
-		ret = phy_read_status(phy_data->phydev);
+		int ret = phy_read_status(phy_data->phydev);
+
 		if (ret < 0)
 			return 0;
 
-- 
2.10.2