From: Rob Clark <robdclark@gmail.com>
Date: Fri, 11 Jul 2014 15:59:22 +0000 (-0400)
Subject: drm/msm: fix potential deadlock in gpu init
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~125^2~18^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a1ad35233345e7ddd9ea3ea7b841432f4723d743;p=pandora-kernel.git

drm/msm: fix potential deadlock in gpu init

Somewhere along the way, the firmware loader sprouted another lock
dependency, resulting in possible deadlock scenario:

 &dev->struct_mutex --> &sb->s_type->i_mutex_key#2 --> &mm->mmap_sem

which is problematic vs things like gem mmap.

So introduce a separate mutex to synchronize gpu init.

Signed-off-by: Rob Clark <robdclark@gmail.com>
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