netdev - [PATCH] net:phy: Add a return value check on bus write

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Message-Id: <20181226173717.7113-1-pakki001@umn.edu>
Date:   Wed, 26 Dec 2018 11:37:17 -0600
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Michal Simek <michal.simek@...inx.com>, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net:phy: Add a return value check on bus write

xgmiitorgmii_read_status() could fail when writing to the bus via
mdiobus_write(). The fix adds a check and returns an error in case
of failure.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 drivers/net/phy/xilinx_gmii2rgmii.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/xilinx_gmii2rgmii.c b/drivers/net/phy/xilinx_gmii2rgmii.c
index 74a8782313cf..926879d43373 100644
--- a/drivers/net/phy/xilinx_gmii2rgmii.c
+++ b/drivers/net/phy/xilinx_gmii2rgmii.c
@@ -58,7 +58,9 @@ static int xgmiitorgmii_read_status(struct phy_device *phydev)
 	else
 		val |= BMCR_SPEED10;
 
-	mdiobus_write(bus, addr, XILINX_GMII2RGMII_REG, val);
+	err = mdiobus_write(bus, addr, XILINX_GMII2RGMII_REG, val);
+	if (err)
+		return err;
 
 	return 0;
 }
-- 
2.17.1