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allocating request. Though, it's unlikely cause if request is NULL
then BUG_ON will be hit in i915_add_request(). So, to unify the callee
uses of i915_add_request(), I'm proposing the following patch. Please
let me know what do you guys think. If you guys agree, I can sent a
formal patch.

Index: work/modi.linux-3.1.1/drivers/gpu/drm/i915/i915_gem.c
===================================================================
--- work.orig/modi.linux-3.1.1/drivers/gpu/drm/i915/i915_gem.c
+++ work/modi.linux-3.1.1/drivers/gpu/drm/i915/i915_gem.c
@@ -1736,8 +1736,6 @@ i915_add_request(struct intel_ring_buffe
 	int was_empty;
 	int ret;

-	BUG_ON(request == NULL);
-
 	ret = ring->add_request(ring, &seqno);
 	if (ret)
 	    return ret;
@@ -2002,9 +2000,11 @@ i915_gem_retire_work_handler(struct work
 			ret = i915_gem_flush_ring(ring,
 						  0, I915_GEM_GPU_DOMAINS);
 			request = kzalloc(sizeof(*request), GFP_KERNEL);
-			if (ret || request == NULL ||
-			    i915_add_request(ring, NULL, request))
-			    kfree(request);
+			if (request) {
+				ret = i915_add_request(ring, NULL, request);
+				if (ret)
+					kfree(request);
+			}
 		}

 		idle &= list_empty(&ring->request_list);


Thanks,
Rakib