From 9f90ff392877581e2c9b54a2d5ecfd1f50d1f170 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 8 Jun 2017 12:14:02 +0100
Subject: [PATCH] drm/i915: Check signaled state after enabling signaling
Git-commit: 9f90ff392877581e2c9b54a2d5ecfd1f50d1f170
Patch-mainline: v4.13-rc1
References: FATE#322643 bsc#1055900

Setting up the irq to signal the request completion takes a finite
amount of time, during which it is possible that the request already
completed. Check afterwards, just in case, so that we can respond
immediately.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170608111405.16466-1-chris@chris-wilson.co.uk
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/i915_gem_request.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -62,7 +62,7 @@ static bool i915_fence_enable_signaling(
 		return false;
 
 	intel_engine_enable_signaling(to_request(fence), true);
-	return true;
+	return !i915_fence_signaled(fence);
 }
 
 static signed long i915_fence_wait(struct dma_fence *fence,