From 42404c09151029689659818e2196ee2fd97142aa Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@davemloft.net>
Date: Tue, 10 Dec 2013 22:05:45 -0500
Subject: [PATCH] Revert "tun: remove useless codes in tun_chr_aio_read() and
 tun_recvmsg()"

This reverts commit 73713357ab58aacda1af715bb5a623528dbbfd79.

MSG_TRUNC handling was broken and is going to be fixed in
the 'net' tree, so revert this.

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