+Minchan Kim
On Mon, Jul 20, 2020 at 12:52 AM Christoph Hellwig <hch@xxxxxx> wrote:
>
> There is no point in trying to call bdev_read_page if SWP_SYNCHRONOUS_IO
> is not set, as the device won't support it. Also there is no point in
> trying a bio submission if bdev_read_page failed.
This will at least break the failure path of zram_rw_page().
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
> mm/page_io.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/mm/page_io.c b/mm/page_io.c
> index ccda7679008851..63b44b8221af0f 100644
> --- a/mm/page_io.c
> +++ b/mm/page_io.c
> @@ -403,8 +403,11 @@ int swap_readpage(struct page *page, bool synchronous)
> goto out;
> }
>
> - ret = bdev_read_page(sis->bdev, swap_page_sector(page), page);
> - if (!ret) {
> + if (sis->flags & SWP_SYNCHRONOUS_IO) {
> + ret = bdev_read_page(sis->bdev, swap_page_sector(page), page);
> + if (ret)
> + goto out;
> +
> if (trylock_page(page)) {
> swap_slot_free_notify(page);
> unlock_page(page);
> --
> 2.27.0
>
--
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