[PATCH] drm/ttm: Fix a memory leak

[Christian König]

Hi Xinhui,

you also need to CC dri-devel for TTM patches, but apart from that it is 
a really good catch.

Am 19.02.21 um 05:25 schrieb xinhui pan:
> Free the memory on failure.
> Also no need to re-alloc memory on retry.
>
> Signed-off-by: xinhui pan <xinhui.pan at amd.com>

Reviewed-by: Christian König <christian.koenig at amd.com>
CC: stable at vger.kernel.org # 5.11

Going to push that to drm-misc-fixes in a Minute since that is a really 
important one.

Thanks,
Christian.

> ---
>   drivers/gpu/drm/ttm/ttm_bo.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> index e38102282fd5..a97d41f4ce3c 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> @@ -906,8 +906,10 @@ static int ttm_bo_bounce_temp_buffer(struct ttm_buffer_object *bo,
>   		return ret;
>   	/* move to the bounce domain */
>   	ret = ttm_bo_handle_move_mem(bo, &hop_mem, false, ctx, NULL);
> -	if (ret)
> +	if (ret) {
> +		ttm_resource_free(bo, &hop_mem);
>   		return ret;
> +	}
>   	return 0;
>   }
>   
> @@ -938,18 +940,19 @@ static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
>   	 * stop and the driver will be called to make
>   	 * the second hop.
>   	 */
> -bounce:
>   	ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
>   	if (ret)
>   		return ret;
> +bounce:
>   	ret = ttm_bo_handle_move_mem(bo, &mem, false, ctx, &hop);
>   	if (ret == -EMULTIHOP) {
>   		ret = ttm_bo_bounce_temp_buffer(bo, &mem, ctx, &hop);
>   		if (ret)
> -			return ret;
> +			goto out;
>   		/* try and move to final place now. */
>   		goto bounce;
>   	}
> +out:
>   	if (ret)
>   		ttm_resource_free(bo, &mem);
>   	return ret;