On Tue, Apr 26, 2022 at 02:46:35PM +0200, Christian König wrote:
> krealloc_array() ignores attempts to reduce the array size, so the attempt
> to save memory is completely pointless here.
>
> Also move testing for the no fence case into sync_file_set_fence(), this
> way we don't even touch the fence array when we don't have any fences.
>
> Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
> drivers/dma-buf/sync_file.c | 21 +++++++--------------
> 1 file changed, 7 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/dma-buf/sync_file.c b/drivers/dma-buf/sync_file.c
> index 514d213261df..0fe564539166 100644
> --- a/drivers/dma-buf/sync_file.c
> +++ b/drivers/dma-buf/sync_file.c
> @@ -157,9 +157,15 @@ static int sync_file_set_fence(struct sync_file *sync_file,
> * we already own a new reference to the fence. For num_fence > 1
> * we own the reference of the dma_fence_array creation.
> */
> - if (num_fences == 1) {
> +
> + if (num_fences == 0) {
> + sync_file->fence = dma_fence_get_stub();
> + kfree(fences);
> +
> + } else if (num_fences == 1) {
> sync_file->fence = fences[0];
> kfree(fences);
> +
> } else {
> array = dma_fence_array_create(num_fences, fences,
> dma_fence_context_alloc(1),
> @@ -261,19 +267,6 @@ static struct sync_file *sync_file_merge(const char *name, struct sync_file *a,
> }
> }
>
> - if (index == 0)
> - fences[index++] = dma_fence_get_stub();
> -
> - if (num_fences > index) {
> - struct dma_fence **tmp;
> -
> - /* Keep going even when reducing the size failed */
> - tmp = krealloc_array(fences, index, sizeof(*fences),
> - GFP_KERNEL);
> - if (tmp)
> - fences = tmp;
> - }
> -
> if (sync_file_set_fence(sync_file, fences, index) < 0)
> goto err_put_fences;
>
> --
> 2.25.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
