vlan_get_protocol_and_depth
vlan_get_protocol_and_depth(skb, skb->protocol, &depth) != 0)
vlan_get_protocol_and_depth(skb, skb->protocol, &depth) != 0)
if (!vlan_get_protocol_and_depth(skb, skb->protocol, &depth))
return vlan_get_protocol_and_depth(skb, type, depth);
vlan_get_protocol_and_depth(skb, skb->protocol, &depth) != 0)