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drm/i915/gt: Only drop heartbeat.systole if the sole owner 

Mika spotted that only using cancel_delayed_work() could mean that we
attempted to clear the heartbeat.systole while the worker was still
running. Rectify the situation by only touching the systole from outside
the worker if we suceeded in cancelling the worker before it could run.
The worker is expected to clean up by itself upon idling.

Reported-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Fixes: 058179e72e ("drm/i915/gt: Replace hangcheck by heartbeats")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191106133129.17732-1-chris@chris-wilson.co.uk
(cherry picked from commit 841e867286)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Chris Wilson 2019-11-06 13:31:29 +00:00 committed by Joonas Lahtinen
parent d9dace9438
commit d29926fa5f
1 changed files with 2 additions and 2 deletions
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2
drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
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@ -141,7 +141,7 @@ void intel_engine_unpark_heartbeat(struct intel_engine_cs *engine)
void intel_engine_park_heartbeat(struct intel_engine_cs *engine)
{
cancel_delayed_work(&engine->heartbeat.work);
if (cancel_delayed_work(&engine->heartbeat.work))
i915_request_put(fetch_and_zero(&engine->heartbeat.systole));
}