[PATCH] dma_fence_array: Fix PENDING_ERROR leak in dma_fence_array_signaled()

[Christian König]

Am 29.11.21 um 08:35 schrieb Thomas Hellström:
> If a dma_fence_array is reported signaled by a call to
> dma_fence_is_signaled(), it may leak the PENDING_ERROR status.
>
> Fix this by clearing the PENDING_ERROR status if we return true in
> dma_fence_array_signaled().
>
> Fixes: 1f70b8b812f3 ("dma-fence: Propagate errors to dma-fence-array container")
> Cc: linaro-mm-sig at lists.linaro.org
> Cc: Christian König <ckoenig.leichtzumerken at gmail.com>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>

Reviewed-by: Christian König <christian.koenig at amd.com>

> ---
>   drivers/dma-buf/dma-fence-array.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma-buf/dma-fence-array.c b/drivers/dma-buf/dma-fence-array.c
> index d3fbd950be94..3e07f961e2f3 100644
> --- a/drivers/dma-buf/dma-fence-array.c
> +++ b/drivers/dma-buf/dma-fence-array.c
> @@ -104,7 +104,11 @@ static bool dma_fence_array_signaled(struct dma_fence *fence)
>   {
>   	struct dma_fence_array *array = to_dma_fence_array(fence);
>   
> -	return atomic_read(&array->num_pending) <= 0;
> +	if (atomic_read(&array->num_pending) > 0)
> +		return false;
> +
> +	dma_fence_array_clear_pending_error(array);
> +	return true;
>   }
>   
>   static void dma_fence_array_release(struct dma_fence *fence)