VLAN state handling fix

[VLAN]: Fix link state propagation

When the queue of the underlying device is stopped at initialization time
or the device is marked "not present", the state will be propagated to the
vlan device and never change. Based on an analysis by Patrick McHardy.
Signed-off-by: Stefan Rompf <stefan@loplof.de>
ACKed-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

net/8021q/vlan.c

@@ -67,10 +67,6 @@ static struct packet_type vlan_packet_type = {
 	.func = vlan_skb_recv, /* VLAN receive method */
 };
 
-/* Bits of netdev state that are propagated from real device to virtual */
-#define VLAN_LINK_STATE_MASK \
-	((1<<__LINK_STATE_PRESENT)|(1<<__LINK_STATE_NOCARRIER)|(1<<__LINK_STATE_DORMANT))
-
 /* End of global variables definitions. */
 
 /*
@@ -470,7 +466,9 @@ static struct net_device *register_vlan_device(const char *eth_IF_name,
 	new_dev->flags = real_dev->flags;
 	new_dev->flags &= ~IFF_UP;
 
-	new_dev->state = real_dev->state & ~(1<<__LINK_STATE_START);
+	new_dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
+					     (1<<__LINK_STATE_DORMANT))) |
+			 (1<<__LINK_STATE_PRESENT);
 
 	/* need 4 bytes for extra VLAN header info,
 	 * hope the underlying device can handle it.