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net: dsa: Avoid null pointer when failing to connect to PHY

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[ Upstream commit 6146dd453e235c487d85ae4dc6cc08978a1c890f ]

When phylink_of_phy_connect fails, dsa_slave_phy_setup tries to save the
day by connecting to an alternative PHY, none other than a PHY on the
switch's internal MDIO bus, at an address equal to the port's index.

However this does not take into consideration the scenario when the
switch that failed to probe an external PHY does not have an internal
MDIO bus at all.

Fixes: aab9c4067d ("net: dsa: Plug in PHYLINK support")
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vladimir Oltean 2019-03-24 01:24:07 +02:00 committed by Greg Kroah-Hartman
parent eb8f7fa734
commit 7245f45625
1 changed files with 4 additions and 4 deletions
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8
net/dsa/slave.c
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@ -1219,9 +1219,9 @@ static int dsa_slave_phy_setup(struct net_device *slave_dev)
phy_flags = ds->ops->get_phy_flags(ds, dp->index);
ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
if (ret == -ENODEV) {
/* We could not connect to a designated PHY or SFP, so use the
* switch internal MDIO bus instead
if (ret == -ENODEV && ds->slave_mii_bus) {
/* We could not connect to a designated PHY or SFP, so try to
* use the switch internal MDIO bus instead
*/
ret = dsa_slave_phy_connect(slave_dev, dp->index);
if (ret) {
@ -1233,7 +1233,7 @@ static int dsa_slave_phy_setup(struct net_device *slave_dev)
}
}
return 0;
return ret;
}
static struct lock_class_key dsa_slave_netdev_xmit_lock_key;