On 2024-05-04 12:47 pm, Fedor Pchelkin wrote:
> If do_map_benchmark() has failed, there is nothing useful to copy back
> to userspace.
I guess there could be some valid partial data if for instance it failed
due to OOM in the middle of running, but the standard tool is still
going to ignore that if the ioctl() returns an error, so meh.
Acked-by: Robin Murphy <robin.murphy@arm.com>
> Suggested-by: Barry Song <21cnbao@gmail.com>
> Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
> ---
> kernel/dma/map_benchmark.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/kernel/dma/map_benchmark.c b/kernel/dma/map_benchmark.c
> index 2478957cf9f8..a6edb1ef98c8 100644
> --- a/kernel/dma/map_benchmark.c
> +++ b/kernel/dma/map_benchmark.c
> @@ -256,6 +256,9 @@ static long map_benchmark_ioctl(struct file *file, unsigned int cmd,
> * dma_mask changed by benchmark
> */
> dma_set_mask(map->dev, old_dma_mask);
> +
> + if (ret)
> + return ret;
> break;
> default:
> return -EINVAL;