[PATCH 18/22] drm/i915: Ignore valid but unknown semaphores

[Chris Wilson]

If we find a ring waiting on a semaphore for another assigned but not yet
emitted request, treat it as valid and waiting.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_irq.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 699ee2c7a3e4..ed74f2d8141d 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2832,10 +2832,10 @@ semaphore_wait_to_signaller_ring(struct intel_engine_cs *engine, u32 ipehr,
 		}
 	}
 
-	DRM_ERROR("No signaller ring found for ring %i, ipehr 0x%08x, offset 0x%016llx\n",
-		  engine->id, ipehr, offset);
+	DRM_DEBUG_DRIVER("No signaller ring found for ring %i, ipehr 0x%08x, offset 0x%016llx\n",
+			 engine->id, ipehr, offset);
 
-	return NULL;
+	return ERR_PTR(-ENODEV);
 }
 
 static struct intel_engine_cs *
@@ -2923,6 +2923,9 @@ static int semaphore_passed(struct intel_engine_cs *engine)
 	if (signaller == NULL)
 		return -1;
 
+	if (IS_ERR(signaller))
+		return 0;
+
 	/* Prevent pathological recursion due to driver bugs */
 	if (signaller->hangcheck.deadlock >= I915_NUM_ENGINES)
 		return -1;
-- 
2.9.3