From 0a4666b539a0e896ec4e8396a034a479e3573125 Mon Sep 17 00:00:00 2001
From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Date: Thu, 12 Feb 2009 13:03:24 -0800
Subject: [PATCH] xen/dev-evtchn: clean up locking in evtchn

Define a new per_user_data mutex to serialize bind/unbind operations
to prevent them from racing with each other.  Fix error returns
and don't do a bind while holding a spinlock.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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