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pc-bios/s390-ccw: break loop if a null block number is reached 

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: ba831b2526 ("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>
Message-Id: <20200924085926.21709-3-mhartmay@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Marc Hartmayer 2020-09-24 10:59:25 +02:00 committed by Thomas Huth
parent 5f97ba0c74
commit 468184ec90
1 changed files with 1 additions and 1 deletions
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2
pc-bios/s390-ccw/bootmap.c
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@ -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;
}