Hi Thomas,
On Thu, Jun 22, 2023 at 12:14:11PM +0200, Thomas Hellström wrote:
> On eviction errors other than -EMULTIHOP we were leaking a resource.
> Fix.
>
> Fixes: 403797925768 ("drm/ttm: Fix multihop assert on eviction.")
> Cc: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
> Cc: Christian König <christian.koenig@xxxxxxx>
> Cc: Christian Koenig <christian.koenig@xxxxxxx>
> Cc: Huang Rui <ray.huang@xxxxxxx>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: <stable@xxxxxxxxxxxxxxx> # v5.15+
> Signed-off-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/ttm/ttm_bo.c | 16 ++++++++--------
> 1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> index 615d30c4262d..89530f2a027f 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> @@ -462,14 +462,14 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo,
> ret = ttm_bo_handle_move_mem(bo, evict_mem, true, ctx, &hop);
> if (ret == -EMULTIHOP) {
> ret = ttm_bo_bounce_temp_buffer(bo, &evict_mem, ctx, &hop);
> - if (ret) {
> - if (ret != -ERESTARTSYS && ret != -EINTR)
> - pr_err("Buffer eviction failed\n");
> - ttm_resource_free(bo, &evict_mem);
> - goto out;
> - }
> - /* try and move to final place now. */
> - goto bounce;
> + if (!ret)
> + /* try and move to final place now. */
> + goto bounce;
As we are at this, can't we replace this with a while()? Goto's
used instead of a while loop are a fist in the eye...
It looks even better:
while (1) {
ret = ttm_bo_handle_move_mem(bo, evict_mem, true, ctx, &hop);
if (!ret)
break;
if (ret == -EMULTIHOP)
ret = ttm_bo_bounce_temp_buffer(bo, &evict_mem,
ctx, &hop);
/* try again */
if (!ret)
continue;
ttm_resource_free(bo, &evict_mem);
if (ret != -ERESTARTSYS && ret != -EINTR)
pr_err("Buffer eviction failed\n");
break;
}
Andi
> + }
> + if (ret) {
> + ttm_resource_free(bo, &evict_mem);
> + if (ret != -ERESTARTSYS && ret != -EINTR)
> + pr_err("Buffer eviction failed\n");
> }
> out:
> return ret;
> --
> 2.40.1
