From f34c4a35d87949fbb0e0f31eba3c054e9f8199ba Mon Sep 17 00:00:00 2001
From: Dmitry Petukhov <dmgenp@gmail.com>
Date: Wed, 9 Apr 2014 02:23:20 +0600
Subject: [PATCH] l2tp: take PMTU from tunnel UDP socket

When l2tp driver tries to get PMTU for the tunnel destination, it uses
the pointer to struct sock that represents PPPoX socket, while it
should use the pointer that represents UDP socket of the tunnel.

Signed-off-by: Dmitry Petukhov <dmgenp@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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