[PATCH 18/26] drm/i915: use new iterator in i915_gem_object_last_write_engine

[Christian König]

This is maybe even a fix since the RCU usage here looks incorrect.

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_object.h | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index e9eecebf5c9d..3343922af4d6 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -500,16 +500,15 @@ static inline struct intel_engine_cs *
 i915_gem_object_last_write_engine(struct drm_i915_gem_object *obj)
 {
 	struct intel_engine_cs *engine = NULL;
+	struct dma_resv_cursor cursor;
 	struct dma_fence *fence;
 
-	rcu_read_lock();
-	fence = dma_resv_get_excl_unlocked(obj->base.resv);
-	rcu_read_unlock();
-
-	if (fence && dma_fence_is_i915(fence) && !dma_fence_is_signaled(fence))
-		engine = to_request(fence)->engine;
-	dma_fence_put(fence);
-
+	dma_resv_for_each_fence_unlocked(obj->base.resv, &cursor, false,
+					 fence) {
+		if (fence && dma_fence_is_i915(fence) &&
+		    !dma_fence_is_signaled(fence))
+			engine = to_request(fence)->engine;
+	}
 	return engine;
 }
 
-- 
2.25.1