Re: [PATCH v2] drm/ttm: fix error handling if no BO can be swapped out

[Christian König <christian.koenig@xxxxxxx>]

Am 22.04.21 um 10:37 schrieb Shiwu Zhang:
> Signed-off-by: Shiwu Zhang <shiwu.zhang@xxxxxxx>
> ---
>   drivers/gpu/drm/ttm/ttm_device.c | 2 +-
>   drivers/gpu/drm/ttm/ttm_tt.c     | 2 ++
>   2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c
> index 1f2024164d72..5dc92b056f0a 100644
> --- a/drivers/gpu/drm/ttm/ttm_device.c
> +++ b/drivers/gpu/drm/ttm/ttm_device.c
> @@ -112,7 +112,7 @@ int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags)
>   {
>   	struct ttm_global *glob = &ttm_glob;
>   	struct ttm_device *bdev;
> -	int ret = -EBUSY;
> +	int ret = 0;

Please don't initialize the return value if we don't need that.

Apart from that looks good to me now.

Thanks,
Christian.

>   
>   	mutex_lock(&ttm_global_mutex);
>   	list_for_each_entry(bdev, &glob->device_list, device_list) {
> diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
> index 48c407cff112..539e0232cb3b 100644
> --- a/drivers/gpu/drm/ttm/ttm_tt.c
> +++ b/drivers/gpu/drm/ttm/ttm_tt.c
> @@ -329,6 +329,8 @@ int ttm_tt_populate(struct ttm_device *bdev,
>   	       ttm_dma32_pages_limit) {
>   
>   		ret = ttm_global_swapout(ctx, GFP_KERNEL);
> +		if (ret == 0)
> +			break;
>   		if (ret < 0)
>   			goto error;
>   	}

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