From: Heiner Kallweit hkallweit1@gmail.com
[ Upstream commit c22c3bbf351e4ce905f082649cffa1ff893ea8c1 ]
If genphy_read_status fails then further access to the PHY may result in unpredictable behavior. To prevent this bail out immediately if genphy_read_status fails.
Fixes: 4223dbffed9f ("net: phy: smsc: Re-enable EDPD mode for LAN87xx") Signed-off-by: Heiner Kallweit hkallweit1@gmail.com Reviewed-by: Simon Horman simon.horman@corigine.com Link: https://lore.kernel.org/r/026aa4f2-36f5-1c10-ab9f-cdb17dda6ac4@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/phy/smsc.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c index caf7291ffaf83..b67de3f9ef186 100644 --- a/drivers/net/phy/smsc.c +++ b/drivers/net/phy/smsc.c @@ -181,8 +181,11 @@ static int lan95xx_config_aneg_ext(struct phy_device *phydev) static int lan87xx_read_status(struct phy_device *phydev) { struct smsc_phy_priv *priv = phydev->priv; + int err;
- int err = genphy_read_status(phydev); + err = genphy_read_status(phydev); + if (err) + return err;
if (!phydev->link && priv->energy_enable) { /* Disable EDPD to wake up PHY */