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drm/msm: fix potential deadlock in gpu init
authorRob Clark <robdclark@gmail.com>
Fri, 11 Jul 2014 15:59:22 +0000 (11:59 -0400)
committerRob Clark <robdclark@gmail.com>
Mon, 4 Aug 2014 15:55:29 +0000 (11:55 -0400)
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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