linux-kernel - [PATCH 4.19 583/639] net: nixge: Fix a signedness bug in nixge

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Message-Id: <20200124093202.505897670@linuxfoundation.org>
Date:   Fri, 24 Jan 2020 10:32:33 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 583/639] net: nixge: Fix a signedness bug in nixge_probe()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 1a4b62a0b8a3b81eca24366f63e214a7144b9f02 ]

The "priv->phy_mode" is an enum and in this context GCC will treat it
as an unsigned int so it can never be less than zero.

Fixes: 492caffa8a1a ("net: ethernet: nixge: Add support for National Instruments XGE netdev")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/ni/nixge.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ni/nixge.c b/drivers/net/ethernet/ni/nixge.c
index 76efed058f334..a791d7932b0ef 100644
--- a/drivers/net/ethernet/ni/nixge.c
+++ b/drivers/net/ethernet/ni/nixge.c
@@ -1233,7 +1233,7 @@ static int nixge_probe(struct platform_device *pdev)
 	}
 
 	priv->phy_mode = of_get_phy_mode(pdev->dev.of_node);
-	if (priv->phy_mode < 0) {
+	if ((int)priv->phy_mode < 0) {
 		netdev_err(ndev, "not find \"phy-mode\" property\n");
 		err = -EINVAL;
 		goto unregister_mdio;
-- 
2.20.1