[VLAN]: Fix hardware rx csum errors

Receiving VLAN packets over a device (without VLAN assist) that is
doing hardware checksumming (CHECKSUM_HW), causes errors because the
VLAN code forgets to adjust the hardware checksum.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index b748648..f2a8750 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -165,6 +165,9 @@
 
 	skb_pull(skb, VLAN_HLEN); /* take off the VLAN header (4 bytes currently) */
 
+	/* Need to correct hardware checksum */
+	skb_postpull_rcsum(skb, vhdr, VLAN_HLEN);
+
 	/* Ok, lets check to make sure the device (dev) we
 	 * came in on is what this VLAN is attached to.
 	 */