Please apply the following patch to stable 4.4. Seems we can hit this
on CDV without an evil userspace. Fixes a warning and a race.
commit d3e376f52d095103ca51dbda4d6ff8aaf488f98f
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date: Mon Nov 23 10:32:49 2015 +0100
drm/gma500: Use correct unref in the gem bo create function
This is called without dev->struct_mutex held, we need to use the
_unlocked variant.
Never caught in the wild since you'd need an evil userspace which
races a gem_close ioctl call with the in-progress open.
Cc: Patrik Jakobsson <patrik.r.jakobsson at gmail.com>
Acked-by: Patrik Jakobsson <patrik.r.jakobsson at gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
Link:
http://patchwork.freedesktop.org/patch/msgid/1448271183-20523-17-git-send-email-daniel.vetter
at ffwll.ch
Cc: <stable at vger.kernel.org> # v4.4
Tested-by: David John Summers
