[Intel-gfx] [PATCH 7/7] drm/i915: GEM operations need to be done under the big lock
chris at chris-wilson.co.uk
Mon Jan 11 07:00:20 PST 2016
On Mon, Jan 11, 2016 at 02:47:17PM +0000, Tvrtko Ursulin wrote:
> On 11/01/16 14:38, Chris Wilson wrote:
> >On Mon, Jan 11, 2016 at 02:08:41PM +0000, Tvrtko Ursulin wrote:
> >>From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> >>VMA creation and GEM list management need the big lock.
> >>Mutex unlock ended on the wrong path somehow. (0-day, Julia Lawall)
> >>Not to mention drm_gem_object_unreference was there in existing
> >>code with no mutex held.
> >>Some callers of i915_gem_object_create_stolen_for_preallocated
> >>already hold the lock so move the mutex into the other caller
> >>as well.
> >intel_pm.c valleyview_setup_pctx?
> Already holds it traced by the WARN_ON at its top.
Which is a nice little mutex inversion of its own. :|
i.e. rpm vs struct_mutex bug
Chris Wilson, Intel Open Source Technology Centre
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