From: Andrew Lunn andrew@lunn.ch
commit af1a02aa23c37045e6adfcf074cf7dbac167a403 upstream.
There is a race condition where the PHY state machine can change members of the phydev structure at the same time userspace requests a change via ethtool. To prevent this, have phy_ethtool_ksettings_set take the PHY lock.
Fixes: 2d55173e71b0 ("phy: add generic function to support ksetting support") Reported-by: Walter Stoll Walter.Stoll@duagon.com Suggested-by: Walter Stoll Walter.Stoll@duagon.com Tested-by: Walter Stoll Walter.Stoll@duagon.com Signed-off-by: Andrew Lunn andrew@lunn.ch Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/phy/phy.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -798,6 +798,7 @@ int phy_ethtool_ksettings_set(struct phy duplex != DUPLEX_FULL))) return -EINVAL;
+ mutex_lock(&phydev->lock); phydev->autoneg = autoneg;
if (autoneg == AUTONEG_DISABLE) { @@ -814,8 +815,9 @@ int phy_ethtool_ksettings_set(struct phy phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl;
/* Restart the PHY */ - phy_start_aneg(phydev); + _phy_start_aneg(phydev);
+ mutex_unlock(&phydev->lock); return 0; } EXPORT_SYMBOL(phy_ethtool_ksettings_set);