From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Tue, 17 Dec 2013 22:42:11 +0000 (+0100)
Subject: drm/i915: grab a pages pin count for preallocate stolen
X-Git-Tag: v3.14-rc1~47^2~16^2~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d8ccba866356e5b8989ff9081df66cf300b1f834;p=pandora-kernel.git

drm/i915: grab a pages pin count for preallocate stolen

But only when we indeed set up a gtt mapping. We need this since the
vma also holds a pages_pin_count, on top of the unconditional
pages_pin_count we grab for all stolen objects (to avoid swap-out).

This should avoid a pages_pin_count underrun when cleaning up
framebuffers objects taken over from the BIOS.

Chris mentioned in his review that this bug even predates the vma
conversion.

Reported-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Ben Widawsky <benjamin.widawsky@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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