author David S. Miller <davem@davemloft.net> 1304887520 -0700
committer David S. Miller <davem@davemloft.net> 1304887520 -0700

l2tp: Fix locking in l2tp_core.c

l2tp_xmit_skb() must take the socket lock.  It makes use of ip_queue_xmit()
which expects to execute in a socket atomic context.

Since we execute this function in software interrupts, we cannot use the
usual lock_sock()/release_sock() sequence, instead we have to use
bh_lock_sock() and see if a user has the socket locked, and if so drop
the packet.

Signed-off-by: David S. Miller <davem@davemloft.net>
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