Chris Wilson a266bf4200 drm/i915/gt: Make intel_ring_unpin() safe for concurrent pint ... In order to avoid some nasty mutex inversions, commit 09c5ab384f ("drm/i915: Keep rings pinned while the context is active") allowed the intel_ring unpinning to be run concurrently with the next context pinning it. Thus each step in intel_ring_unpin() needed to be atomic and ordered in a nice onion with intel_ring_pin() so that the lifetimes overlapped and were always safe. Sadly, a few steps in intel_ring_unpin() were overlooked, such as closing the read/write pointers of the ring and discarding the intel_ring.vaddr, as these steps were not serialised with intel_ring_pin() and so could leave the ring in disarray. Fixes: 09c5ab384f ("drm/i915: Keep rings pinned while the context is active") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191118230254.2615942-6-chris@chris-wilson.co.uk		2019-11-19 15:12:46 +00:00
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gpu	drm/i915/gt: Make intel_ring_unpin() safe for concurrent pint	2019-11-19 15:12:46 +00:00
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video	Linux 5.4-rc7	2019-11-14 05:53:10 +10:00
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