[PATCH 2/2] drm/amdgpu: set tbo pointer as null after amdgpu bo is freed

[Huang Rui]

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.huang at amd.com>
Cc: Christian König <christian.koenig at amd.com>
Cc: Tom StDenis <Tom.StDenis at 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