From dedaa8f0e6967edb9127a6643d0259e794196ed2 Mon Sep 17 00:00:00 2001
From: Roy Spliet <r.spliet@student.tudelft.nl>
Date: Fri, 19 Jul 2013 23:59:12 +0200
Subject: [PATCH] drm/nvc0/fb: take lock in nvc0_ram_put()

Kernel panic caused by list corruption in ltcg seems to indicate a
concurrency issue.

Take mutex of pfb like nv50_ram_put() to eliminate concurrency.

V2: Separate critical section into separate function, avoid taking the
    lock twice on NVC0

Signed-off-by: Roy Spliet <r.spliet@student.tudelft.nl>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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