commit 09df57ca604512b29b6096afb381c839ccbd2912
author Eric Dumazet <eric.dumazet@gmail.com> Fri Oct 07 05:45:57 2011 +0000
committer David S. Miller <davem@davemloft.net> Tue Oct 18 23:33:44 2011 -0400
tree d7a820fea1ef93ad5a2e8ba74926b85b451428cb
parent bc416d9768aa9a2e46eb11354a9c58399dafeb01

l2tp: give proper headroom in pppol2tp_xmit()

pppol2tp_xmit() calls skb_cow_head(skb, 2) before calling
l2tp_xmit_skb()

Then l2tp_xmit_skb() calls again skb_cow_head(skb, large_headroom)

This patchs changes the first skb_cow_head() call to supply the needed
headroom to make sure at most one (expensive) pskb_expand_head() is
done.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>