[BRIDGE]: Propagate bridge internal MTU changes

Need to propagate MTU changes that the bridge does to it's pseudo interface
up to others. There ends up being a double call to br_min_mtu() but that's
harmless.

Cleans up the EXPORT_SYMBOLS including dev_change_flags which is used by vlan.
Shouldn't be basing exports on kernel config options like this.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@redhat.com>

net/bridge/br_if.c

@@ -295,6 +295,7 @@ int br_del_bridge(const char *name)
 	return ret;
 }
 
+/* Mtu of the bridge pseudo-device 1500 or the minimum of the ports */
 int br_min_mtu(const struct net_bridge *br)
 {
 	const struct net_bridge_port *p;
@@ -347,7 +348,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
 			br_stp_enable_port(p);
 		spin_unlock_bh(&br->lock);
 
-		br->dev->mtu = br_min_mtu(br);
+		dev_set_mtu(br->dev, br_min_mtu(br));
 	}
 
 	return err;

net/bridge/br_notify.c

@@ -48,7 +48,7 @@ static int br_device_event(struct notifier_block *unused, unsigned long event, v
 		break;
 
 	case NETDEV_CHANGEMTU:
-		br->dev->mtu = br_min_mtu(br);
+		dev_set_mtu(br->dev, br_min_mtu(br));
 		break;
 
 	case NETDEV_DOWN:

net/core/dev.c

@@ -3431,6 +3431,8 @@ EXPORT_SYMBOL(dev_queue_xmit_nit);
 EXPORT_SYMBOL(dev_remove_pack);
 EXPORT_SYMBOL(dev_set_allmulti);
 EXPORT_SYMBOL(dev_set_promiscuity);
+EXPORT_SYMBOL(dev_change_flags);
+EXPORT_SYMBOL(dev_set_mtu);
 EXPORT_SYMBOL(free_netdev);
 EXPORT_SYMBOL(netdev_boot_setup_check);
 EXPORT_SYMBOL(netdev_set_master);
@@ -3448,10 +3450,7 @@ EXPORT_SYMBOL(unregister_netdevice_notifier);
 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
 EXPORT_SYMBOL(br_handle_frame_hook);
 #endif
-/* for 801q VLAN support */
-#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
-EXPORT_SYMBOL(dev_change_flags);
-#endif
+
 #ifdef CONFIG_KMOD
 EXPORT_SYMBOL(dev_load);
 #endif