linux-kernel - [PATCH net] of: mdio: Fix a signedness bug in of_phy_get_and

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Message-ID: <20190925110100.GL3264@mwanda>
Date:   Wed, 25 Sep 2019 14:01:00 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Andrew Lunn <andrew@...n.ch>, Dongpo Li <lidongpo@...ilicon.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH net] of: mdio: Fix a signedness bug in
 of_phy_get_and_connect()

The "iface" variable is an enum and in this context GCC treats it as
an unsigned int so the error handling is never triggered.

Fixes: b78624125304 ("of_mdio: Abstract a general interface for phy connect")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/of/of_mdio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 000b95787df1..bd6129db6417 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -362,7 +362,7 @@ struct phy_device *of_phy_get_and_connect(struct net_device *dev,
 	int ret;
 
 	iface = of_get_phy_mode(np);
-	if (iface < 0)
+	if ((int)iface < 0)
 		return NULL;
 	if (of_phy_is_fixed_link(np)) {
 		ret = of_phy_register_fixed_link(np);
-- 
2.20.1