[Intel-gfx] [PATCH 7/7] drm/i915: Simplify check for idleness in hangcheck

[Chris Wilson]

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 at chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index c85eb8dec2dc..a56be4f92264 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2805,8 +2805,7 @@ static void gen8_disable_vblank(struct drm_device *dev, unsigned int pipe)
 static bool
 ring_idle(struct intel_engine_cs *engine, u32 seqno)
 {
-	return (list_empty(&engine->request_list) ||
-		i915_seqno_passed(seqno, engine->last_submitted_seqno));
+	return i915_seqno_passed(seqno, engine->last_submitted_seqno);
 }
 
 static bool
-- 
2.8.0.rc3