drm/i915: Simplify check for idleness in hangcheck
Having fixed the tracking of the engine's last_submitted_seqno, we can now rely on it for detecting when the engine is idle (and not have to touch the requests pointer). Testcase: igt/gem_exec_whisper Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1460010558-10705-9-git-send-email-chris@chris-wilson.co.ukReviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
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