Re: [PATCH 6/7] md: partially revert "md/raid6: use valid sector values to determine if an I/O should wait on the reshape"

[Song Liu <song@kernel.org>]

On Wed, Jan 17, 2024 at 10:22 AM Mikulas Patocka <mpatocka@redhat.com> wrote:
>
[...]
> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
> Fixes: c467e97f079f ("md/raid6: use valid sector values to determine if an I/O should wait on the reshape")
> Cc: stable@vger.kernel.org      # v6.1+
>
> ---
>  drivers/md/raid5.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> Index: linux-2.6/drivers/md/raid5.c
> ===================================================================
> --- linux-2.6.orig/drivers/md/raid5.c
> +++ linux-2.6/drivers/md/raid5.c
> @@ -5851,7 +5851,7 @@ static bool stripe_ahead_of_reshape(stru
>                         continue;
>
>                 min_sector = min(min_sector, sh->dev[dd_idx].sector);
> -               max_sector = max(max_sector, sh->dev[dd_idx].sector);
> +               max_sector = min(max_sector, sh->dev[dd_idx].sector);

This looks wrong. max_sector was initialized to 0, so
min(max_sector, sh->dev[dd_idx].sector) will always be 0.

Did I miss/misread something here?

Thanks,
Song

>         }
>
>         spin_lock_irq(&conf->device_lock);
>