From: Heiner Kallweit <hkallweit1@xxxxxxxxx>
[ 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@xxxxxxxxx>
Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/026aa4f2-36f5-1c10-ab9f-cdb17dda6ac4@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 04e628788f1b5..36dcf6c7f445d 100644
--- a/drivers/net/phy/smsc.c
+++ b/drivers/net/phy/smsc.c
@@ -206,8 +206,11 @@ 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 && phydev->irq == PHY_POLL) {
/* Disable EDPD to wake up PHY */
--
2.39.2
