From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Wed, 6 Aug 2014 13:04:48 +0000 (+0200)
Subject: drm/i915: Only refcount ppgtt if it actually is one
X-Git-Tag: fixes-against-v3.18-rc2~73^2~73^2~40
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=841cd7737557785c0f215b0984c06aaaaa882302;p=pandora-kernel.git

drm/i915: Only refcount ppgtt if it actually is one

This essentially unbreaks non-ppgtt operation where we'd scribble over
random memory.

While at it give the vm_to_ppgtt function a proper prefix and make it
a bit more paranoid.

Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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