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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>
This commit is contained in:
Andrew Lunn 2016-03-12 00:01:37 +01:00 committed by David S. Miller
parent ca3dfa51e6
commit b71be352f7
1 changed files with 8 additions and 4 deletions
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12
net/dsa/slave.c
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@ -896,11 +896,15 @@ static void dsa_slave_adjust_link(struct net_device *dev)
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;
}