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[ Upstream commit aca5f58f9b ]
The VLAN tag handling code in netpoll_send_skb_on_dev() has two problems.
1) It exits without unlocking the TXQ.
2) It then tries to queue a NULL skb to npinfo->txq.
Reported-by: Ahmed Tamrawi <atamrawi@iastate.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
[ kamal: backport to 3.8 (context) ]
Signed-off-by: Kamal Mostafa <kamal@canonical.com>