[PATCH] initialize a spin lock in gianfar driver

Initialize the mdio_lock spin lock in mii_info struct, which is otherwise
accessed prior to initialization.
Signed-off-by: Jaka Mocnik <jaka@activetools.si>
Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

drivers/net/gianfar.c

@@ -377,6 +377,8 @@ static int init_phy(struct net_device *dev)
 			ADVERTISED_1000baseT_Full);
 	mii_info->autoneg = 1;
 
+	spin_lock_init(&mii_info->mdio_lock);
+
 	mii_info->mii_id = priv->einfo->phyid;
 
 	mii_info->dev = dev;