From d5c1e84b3a130f0743b218b33ff7d9cb493ab5b4 Mon Sep 17 00:00:00 2001
From: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Date: Tue, 14 Jan 2014 16:48:58 +0100
Subject: [PATCH] drm/nouveau: hold mutex while syncing to kernel channel

Not holding the mutex potentially causes corruption of the kernel
channel when page flipping.

Cc: stable@vger.kernel.org #3.13
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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Reading git-format-patch failed