From: Stephen Hemminger <stephen@networkplumber.org>
Date: Mon, 17 Jun 2013 21:16:10 +0000 (-0700)
Subject: vxlan: move IGMP join/leave to work queue
X-Git-Tag: v3.11-rc1~64^2~62^2~1^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7c47cedf43a8b3086c3dcf26cbc058747ee21bec;p=pandora-kernel.git

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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