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

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: aab9c4067d23 ("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>

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 093eef6f25995e29d6c06988148d36f598c5b4b7..6a8418dfa64f3d603fc6f6baa0c25c2c5e2034e6 100644 (file)
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1283,9 +1283,9 @@ 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) {
@@ -1297,7 +1297,7 @@ 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;