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

[Lazar, Lijo]

On 9/3/2024 6:01 PM, Asher Song wrote:
> 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.
> 
> Fixes:d99fbd9aab62 ("drm/ttm: Always take the bo delayed cleanup path for imported bos")
> Acked-by: Christian König <christian.koenig at amd.com>
> Signed-off-by: Asher Song <Asher.Song at amd.com>

Acked-by: Lijo Lazar <lijo.lazar at amd.com>

Thanks,
Lijo

> ---
>  drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> index 0a5c8d97787a..99017e426618 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> @@ -2216,6 +2216,7 @@ static int gmc_v9_0_sw_fini(void *handle)
>  	if (!adev->gmc.real_vram_size) {
>  		dev_info(adev->dev, "Put GART in system memory for APU free\n");
>  		amdgpu_gart_table_ram_free(adev);
> +		drain_workqueue(adev->mman.bdev.wq);
>  	} else {
>  		amdgpu_gart_table_vram_free(adev);
>  	}