From: Roy Spliet <r.spliet@student.tudelft.nl>
Date: Fri, 19 Jul 2013 21:59:12 +0000 (+0200)
Subject: drm/nvc0/fb: take lock in nvc0_ram_put()
X-Git-Tag: v3.11-rc4~18^2~2^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dedaa8f0e6967edb9127a6643d0259e794196ed2;p=pandora-kernel.git

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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