[PATCH] drm/amdgpu: Fix some unload driver issues

[Emily Deng]

If have memory leak, maybe it will have issue in
ttm_bo_force_list_clean-> ttm_mem_evict_first.

Set adev->gart.ptr to null to avoid to call
amdgpu_gmc_set_pte_pde to cause ptr issue pointer when
calling amdgpu_gart_unbind in amdgpu_bo_fini which is after gart_fini.

Signed-off-by: Emily Deng <Emily.Deng at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
index 23823a57374f..f1ede4b43d07 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c
@@ -202,6 +202,7 @@ void amdgpu_gart_table_vram_free(struct amdgpu_device *adev)
 		return;
 	}
 	amdgpu_bo_unref(&adev->gart.bo);
+	adev->gart.ptr = NULL;
 }
 
 /*
-- 
2.25.1