smsc911x: fix BUG if module is removed while interface is up

If the module is removed while its interface is up, smsc911x_stop is not
called until after smsc911x_drv_remove has disposed of phy_dev.  This
patch changes the stop method to handle this situation.

This is a different problem to the one reported by dfoley@telus.net.

Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/net/smsc911x.c b/drivers/net/smsc911x.c
index ecdde03d4167..8078f3545f16 100644
--- a/drivers/net/smsc911x.c
+++ b/drivers/net/smsc911x.c
@@ -1267,8 +1267,6 @@ static int smsc911x_stop(struct net_device *dev)
         struct smsc911x_data *pdata = netdev_priv(dev);
         unsigned int temp;
 
-        BUG_ON(!pdata->phy_dev);
-
         /* Disable all device interrupts */
         temp = smsc911x_reg_read(pdata, INT_CFG);
         temp &= ~INT_CFG_IRQ_EN_;
@@ -1283,7 +1281,8 @@ static int smsc911x_stop(struct net_device *dev)
         smsc911x_tx_update_txcounters(dev);
 
         /* Bring the PHY down */
-        phy_stop(pdata->phy_dev);
+        if (pdata->phy_dev)
+                phy_stop(pdata->phy_dev);
 
         SMSC_TRACE(IFDOWN, "Interface stopped");
         return 0;