From e69e46261063a25c3907bed16a2e9d18b115d1fd Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Mon, 6 Feb 2017 15:55:23 -0800 Subject: [PATCH] net: dsa: Do not clobber PHY link outside of state machine Calling phy_read_status() means that we may call into genphy_read_status() which in turn will use genphy_update_link() which can make changes to phydev->link outside of the state machine's state transitions. This is an invalid behavior that is now caught as of 811a919135b9 ("phy state machine: failsafe leave invalid RUNNING state") Reported-by: Zefir Kurtisi Signed-off-by: Florian Fainelli Reviewed-by: Andrew Lunn Signed-off-by: David S. Miller --- net/dsa/slave.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/net/dsa/slave.c b/net/dsa/slave.c index 061a49c29cef..c34872e1febc 100644 --- a/net/dsa/slave.c +++ b/net/dsa/slave.c @@ -684,14 +684,10 @@ dsa_slave_get_link_ksettings(struct net_device *dev, struct ethtool_link_ksettings *cmd) { struct dsa_slave_priv *p = netdev_priv(dev); - int err; + int err = -EOPNOTSUPP; - err = -EOPNOTSUPP; - if (p->phy != NULL) { - err = phy_read_status(p->phy); - if (err == 0) - err = phy_ethtool_ksettings_get(p->phy, cmd); - } + if (p->phy != NULL) + err = phy_ethtool_ksettings_get(p->phy, cmd); return err; }