Re: [PATCH 2/3] pc-bios/s390-ccw: break loop if a null block number is reached

[Thomas Huth <thuth@redhat.com>]

On 24/09/2020 10.59, Marc Hartmayer wrote:
> Break the loop if `cur_block_nr` is a null block number because this
> means that the end of chunk is reached. In this case we will try to
> boot the default entry.
> 
> Fixes: ba831b25262a ("s390-ccw: read stage2 boot loader data to find menu")
> Reviewed-by: Collin Walling <walling@linux.ibm.com>
> Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
> ---
>  pc-bios/s390-ccw/bootmap.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c
> index 0d29dceaa3cc..08f16c5595a3 100644
> --- a/pc-bios/s390-ccw/bootmap.c
> +++ b/pc-bios/s390-ccw/bootmap.c
> @@ -192,7 +192,7 @@ static int eckd_get_boot_menu_index(block_number_t s1b_block_nr)
>      for (i = 0; i < STAGE2_BLK_CNT_MAX; i++) {
>          cur_block_nr = eckd_block_num(&s1b->seek[i].chs);
>  
> -        if (!cur_block_nr) {
> +        if (!cur_block_nr || is_null_block_number(cur_block_nr)) {
>              break;
>          }

Reviewed-by: Thomas Huth <thuth@redhat.com>

I'll queue the two patches on my s390-ccw bios branch. Just let me know
if you'd like to have the "< ... - 3" changed into "<= ... - 4" in the
first patch, I can tweak it directly if you like.

 Thomas