Based upon a patch from Herbert Xu:

> Hi Ingo:
> 
> Your recent fix to dev_queue_xmit moved the local_bh_disable to
> include stuff like skb_linearize and skb_checksum_help.  These
> are potentially expensive operations.  Since they don't need to
> run with preempt off, we could simply move the local_bh_enable
> up instead.

No, this breaks the normal return path.

How about this instead?
Signed-off-by: Tommy S. Christensen <tommy.christensen@tpack.net>
Signed-off-by: David S. Miller <davem@davemloft.net>