In function blk_mq_map_queues, qmap->nr_queues may equal zero
and thus it needs to be checked before we pass it to function
queue_index.
Signed-off-by: Yiyuan GUO <yguoaz@xxxxxxxxxx>
---
block/blk-mq-cpumap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c
index 3db84d319..c2163658e 100644
--- a/block/blk-mq-cpumap.c
+++ b/block/blk-mq-cpumap.c
@@ -64,7 +64,7 @@ int blk_mq_map_queues(struct blk_mq_queue_map *qmap)
map[cpu] = queue_index(qmap, nr_queues, q++);
} else {
first_sibling = get_first_sibling(cpu);
- if (first_sibling == cpu)
+ if ((first_sibling == cpu) && nr_queues)
map[cpu] = queue_index(qmap, nr_queues, q++);
else
map[cpu] = map[first_sibling];
--
2.25.1
