bridge: avoid ethtool on non running interface

If bridge port is offline, don't call ethtool to query speed.
Signed-off-by: NStephen Hemminger <shemminger@vyatta.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/bridge/br_if.c

@@ -67,12 +67,14 @@ void br_port_carrier_check(struct net_bridge_port *p)
 	struct net_device *dev = p->dev;
 	struct net_bridge *br = p->br;
 
-	if (netif_carrier_ok(dev))
+	if (netif_running(dev) && netif_carrier_ok(dev))
 		p->path_cost = port_cost(dev);
 
-	if (netif_running(br->dev)) {
+	if (!netif_running(br->dev))
+		return;
+
 	spin_lock_bh(&br->lock);
-		if (netif_carrier_ok(dev)) {
+	if (netif_running(dev) && netif_carrier_ok(dev)) {
 		if (p->state == BR_STATE_DISABLED)
 			br_stp_enable_port(p);
 	} else {
@@ -80,7 +82,6 @@ void br_port_carrier_check(struct net_bridge_port *p)
 			br_stp_disable_port(p);
 	}
 	spin_unlock_bh(&br->lock);
-	}
 }
 
 static void release_nbp(struct kobject *kobj)