From 1c51a9159ddefa5119724a4c7da3fd3ef44b68d5 Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <stephen@networkplumber.org>
Date: Mon, 17 Jun 2013 14:16:11 -0700
Subject: [PATCH] vxlan: fix race caused by dropping rtnl_unlock

It is possible for two cpu's to race creating vxlan device.
For most cases this is harmless, but the ability to assign "next
avaliable vxlan device" relies on rtnl lock being held across the
whole operation. Therfore two instances of calling:
  ip li add vxlan%d vxlan ...
could collide and create two devices with same name.

To fix this defer creation of socket to a work queue, and
handle possible races there. Introduce a lock to ensure that
changes to vxlan socket hash list is SMP safe.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
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