commit b71be352f76ac3c0559feec2fd960ab9c31404c9
author Andrew Lunn <andrew@lunn.ch> Sat Mar 12 00:01:37 2016 +0100
committer David S. Miller <davem@davemloft.net> Mon Mar 14 15:43:10 2016 -0400
tree 4f49a80ac245645735c74989efe5d233a8697968
parent ca3dfa51e67cd41f6514b84a88bc101e8b1a139a

dsa: slave: Don't reference NULL pointer during phy_disconnect

When the phy is disconnected, the parent pointer to the netdev it was
attached to is set to NULL. The code then tries to suspend the phy,
but dsa_slave_fixed_link_update needs the parent pointer to determine
which switch the phy is connected to. So it dereferenced a NULL
pointer. Check for this condition.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>