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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
811a919135 ("phy state machine: failsafe leave invalid RUNNING state")

Reported-by: Zefir Kurtisi <zefir.kurtisi@neratec.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2017-02-06 15:55:23 -08:00 committed by David S. Miller
parent 6136c8fe53
commit e69e462610
1 changed files with 3 additions and 7 deletions
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10
net/dsa/slave.c
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@ -684,14 +684,10 @@ dsa_slave_get_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *cmd) struct ethtool_link_ksettings *cmd)
{ {
struct dsa_slave_priv *p = netdev_priv(dev); struct dsa_slave_priv *p = netdev_priv(dev);
int err; int err = -EOPNOTSUPP;
err = -EOPNOTSUPP; if (p->phy != NULL)
if (p->phy != NULL) { err = phy_ethtool_ksettings_get(p->phy, cmd);
err = phy_read_status(p->phy);
if (err == 0)
err = phy_ethtool_ksettings_get(p->phy, cmd);
}
return err; return err;
} }