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>
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 27bf03d..49056d9 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -896,11 +896,15 @@
static int dsa_slave_fixed_link_update(struct net_device *dev,
struct fixed_phy_status *status)
{
- struct dsa_slave_priv *p = netdev_priv(dev);
- struct dsa_switch *ds = p->parent;
+ struct dsa_slave_priv *p;
+ struct dsa_switch *ds;
- if (ds->drv->fixed_link_update)
- ds->drv->fixed_link_update(ds, p->port, status);
+ if (dev) {
+ p = netdev_priv(dev);
+ ds = p->parent;
+ if (ds->drv->fixed_link_update)
+ ds->drv->fixed_link_update(ds, p->port, status);
+ }
return 0;
}