From 7c47cedf43a8b3086c3dcf26cbc058747ee21bec Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <stephen@networkplumber.org>
Date: Mon, 17 Jun 2013 14:16:10 -0700
Subject: [PATCH] vxlan: move IGMP join/leave to work queue

Do join/leave from work queue to avoid lock inversion problems
between normal socket and RTNL. The code comes out cleaner
as well.

Uses Cong Wang's suggestion to turn refcnt into a real atomic
since now need to handle case where last use of socket is IGMP
worker.

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