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drm/i915: Park the signaler before sleeping

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If the signal to park arrives before we sleep, then we need to check
kthread_should_park() before sleeping to avoid missing the signal.
Otherwise, if the signal arrives whilst we are processing completed
requests, we will reset the current->state back to TASK_INTERRUPTIBLE
and so miss the wakeup.

Fixes: fe3288b5da ("drm/i915: Park the breadcrumbs signaler across a GPU reset")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170403105124.8969-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
(cherry picked from commit b1becb8826)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Chris Wilson 2017-04-03 11:51:24 +01:00 committed by Jani Nikula
parent f8a77153b0
commit 1676a2b35c
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/i915/intel_breadcrumbs.c
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@ -629,6 +629,9 @@ static int intel_breadcrumbs_signaler(void *arg)
} else {
DEFINE_WAIT(exec);
if (kthread_should_park())
kthread_parkme();
if (kthread_should_stop()) {
GEM_BUG_ON(request);
break;
@ -641,9 +644,6 @@ static int intel_breadcrumbs_signaler(void *arg)
if (request)
remove_wait_queue(&request->execute, &exec);
if (kthread_should_park())
kthread_parkme();
}
i915_gem_request_put(request);
} while (1);