netdev - [PATCH] net: phy: phy: check return value of bus write

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Message-Id: <20181226180406.7881-1-pakki001@umn.edu>
Date:   Wed, 26 Dec 2018 12:04:06 -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>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: phy: phy: check return value of bus write

phy_mii_ioctl() 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/phy.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 1d73ac3309ce..1fbdaa96b36e 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -397,6 +397,7 @@ int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 	struct mii_ioctl_data *mii_data = if_mii(ifr);
 	u16 val = mii_data->val_in;
 	bool change_autoneg = false;
+	int rc;
 
 	switch (cmd) {
 	case SIOCGMIIPHY:
@@ -443,8 +444,10 @@ int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
 			}
 		}
 
-		mdiobus_write(phydev->mdio.bus, mii_data->phy_id,
-			      mii_data->reg_num, val);
+		rc = mdiobus_write(phydev->mdio.bus, mii_data->phy_id,
+				   mii_data->reg_num, val);
+		if (rc)
+			return rc;
 
 		if (mii_data->phy_id == phydev->mdio.addr &&
 		    mii_data->reg_num == MII_BMCR &&
-- 
2.17.1