[PATCH v2] drm/amdgpu: fix a call trace when unload amdgpu driver

[Asher Song]

In some APUs, the bo type of GART page table is ttm_bo_type_sg.
Those type BOs is released by bo->delayed_delete which is added in ttm_device->wq, not released immediately.

To make sure all the ttm_resource is released before ttm_resource_manager is finilized, drain the workqueue in ttm_device.

v2: move drain_workqueue to amdgpu_ttm.c

Fixes:d99fbd9aab62 ("drm/ttm: Always take the bo delayed cleanup path for imported bos")
Suggested-by: Christian König <christian.koenig at amd.com>
Signed-off-by: Asher Song <Asher.Song at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 5c938ff0bf48..cbac21df5c47 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -2461,6 +2461,7 @@ void amdgpu_ttm_fini(struct amdgpu_device *adev)
 		drm_dev_exit(idx);
 	}
 
+	drain_workqueue(adev->mman.bdev.wq);
 	amdgpu_direct_gma_fini(adev);
 	amdgpu_vram_mgr_fini(adev);
 	amdgpu_gtt_mgr_fini(adev);
-- 
2.25.1