The tbo pointer will still have value even the amdgpu bo is freed.
It doesn't make sense that it still points a freed memory. It could be refered
mistakenly, so set it as null.

Signed-off-by: Huang Rui <ray.hu...@amd.com>
Cc: Christian K??nig <christian.koe...@amd.com>
Cc: Tom StDenis <tom.stde...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index de990bd..ae84c08 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -108,6 +108,7 @@ static void amdgpu_bo_destroy(struct ttm_buffer_object *tbo)
        }
        kfree(bo->metadata);
        kfree(bo);
+       tbo = NULL;
 }
 
 /**
-- 
2.7.4

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