Commit 841e8672 authored by Chris Wilson's avatar Chris Wilson

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: default avatarMika Kuoppala <mika.kuoppala@linux.intel.com>
Fixes: 058179e7 ("drm/i915/gt: Replace hangcheck by heartbeats")
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: default avatarMika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191106133129.17732-1-chris@chris-wilson.co.uk
parent cddb85dc
......@@ -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));
}
......
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