drm/i915: Only discard backing storage on releasing the last ref
Before purging our pages (as opposed to copying back the contents from the GPU), make sure that there is not an exposed CPU mmapping through which the user can inspect the results. Regression from commit 5537252b Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Tue Mar 25 13:23:06 2014 +0000 drm/i915: Invalidate our pages under memory pressure Testcase: igt/gem_mmap/new-object Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79005Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Tested-by: Guo Jinxian <jinxianx.guo@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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