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

[Christian König]

Am 04.09.24 um 10:04 schrieb 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>

Reviewed-by: Christian König <christian.koenig 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);