[PATCH 07/22] drm/amdgpu: fix fence_emit NULL pointer ref risk

[Monk Liu]

Change-Id: Ic39de73338d515d4e33a828f445d8a3c3ba544bb
Signed-off-by: Monk Liu <Monk.Liu at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
index 008e198..401d710 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -163,7 +163,8 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f)
 
 	rcu_assign_pointer(*ptr, dma_fence_get(&fence->base));
 
-	*f = &fence->base;
+	if (f)
+		*f = &fence->base;
 
 	return 0;
 }
-- 
2.7.4