From 19a10828814aa3ba483301b416b27f94330e0c80 Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Mon, 1 Dec 2014 11:44:27 +1000
Subject: [PATCH] drm/nouveau/fifo/g84-: ack non-stall interrupt before
 handling it

Closes a very unlikely race that can occur if another NonStallInterrupt
method passes between checking fences and acking the previous interrupt.

With this change, the interrupt will re-fire under such conditions.

Tested-by: Tobias Klausmann <tobias.johannes.klausmann@mni.thm.de>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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