From 8ca19a8937ad91703cfefccf13bd8017b39510cd Mon Sep 17 00:00:00 2001
From: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Date: Thu, 27 Oct 2011 17:58:48 -0400
Subject: [PATCH] xen/gntalloc: Change gref_lock to a mutex

The event channel release function cannot be called under a spinlock
because it can attempt to acquire a mutex due to the event channel
reference acquired when setting up unmap notifications.

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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