drm/i915: Clear gt.active_requests before checking idle status
commit 8490ae20 ("drm/i915: Suppress busy status for engines if wedged") moved the check for inflight requests to the intel_engines_are_idle() check to protect the idle worker. However, the request selftests were also checking the engine idle status and erroring out if they did not become idle within a short period of time after the final wait. In order to accommodate the new check, call retire requests prior to the engine check so that we flush all the waits. Fixes: 8490ae20 ("drm/i915: Suppress busy status for engines if wedged") Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.william.auld@gmail.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170331192121.10024-1-chris@chris-wilson.co.ukReviewed-by: Matthew Auld <matthew.william.auld@gmail.com>
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