commit 0f75b09c798ed00c30d7d5551b896be883bc2aeb
Author: Phil Sutter <phil@nwl.cc>
Date:   Fri Aug 2 11:37:39 2013 +0200

    af_packet: when sending ethernet frames, parse header for skb->protocol
    
    This may be necessary when the SKB is passed to other layers on the go,
    which check the protocol field on their own. An example is a VLAN packet
    sent out using AF_PACKET on a bridge interface. The bridging code checks
    the SKB size, accounting for any VLAN header only if the protocol field
    is set accordingly.
    
    Note that eth_type_trans() sets skb->dev to the passed argument, so this
    can be skipped in packet_snd() for ethernet frames, as well.
    
    Signed-off-by: Phil Sutter <phil@nwl.cc>
    Signed-off-by: David S. Miller <davem@davemloft.net>