From: Imre Deak <imre.deak@intel.com>
Date: Fri, 12 Dec 2014 15:57:38 +0000 (+0200)
Subject: drm/i915: fix use after free during eDP encoder destroying
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~75^2~43^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c8bd0e49519ce1d80196e54ba2e20c3a1b7c88c0;p=pandora-kernel.git

drm/i915: fix use after free during eDP encoder destroying

After

commit a18c0af171bfb875012da26f23df051004726973
uthor: Thierry Reding <treding@nvidia.com>
Date:   Wed Dec 10 11:38:49 2014 +0100

    drm: Zero out DRM object memory upon cleanup

we will use the eDP encoder during destroying it. Fix this by calling
drm_encoder_cleanup() at a point when the encoder is not used any more.
This caused a NULL pointer dereference in pps_lock(), I can't see that
it caused any other problem.

All the other encoders seem to call drm_encoder_cleanup() at a safe
place.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

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