| Message ID | 1891546521.01644873481638.JavaMail.epsvc@epcpadp4 |
|---|---|
| State | New |
| Headers | show |
| Series | scsi: ufs: Fix divide zero case in ufshcd_map_queues() | expand |
On 2/14/22 02:33, Jinyoung CHOI wrote: > Before calling blk_mq_map_queues(), the mq_map and nr_queues belonging > to "struct blk_mq_queue_map" must be a vaild value. ^^ ^^^^^ have valid > If nr_queues is set to 0, the system may encounter the "divide zero" > depending on the type of architecture. Anyway: Reviewed-by: Bart Van Assche <bvanassche@acm.org>
>On 2/14/22 02:33, Jinyoung CHOI wrote: >> Before calling blk_mq_map_queues(), the mq_map and nr_queues belonging >> to "struct blk_mq_queue_map" must be a vaild value. > ^^ ^^^^^ > have valid > >> If nr_queues is set to 0, the system may encounter the "divide zero" >> depending on the type of architecture. > >Anyway: > >Reviewed-by: Bart Van Assche <bvanassche@acm.org> Hi, Bart. Thanks for your review. I will be careful of typo. :) Best Regards, Jinyoung Choi
On Mon, 14 Feb 2022 19:33:52 +0900, Jinyoung CHOI wrote: > Before calling blk_mq_map_queues(), the mq_map and nr_queues belonging > to "struct blk_mq_queue_map" must be a vaild value. > > If nr_queues is set to 0, the system may encounter the "divide zero" > depending on the type of architecture. > > blk_mq_map_queues() -> queue_index() > > [...] Applied to 5.17/scsi-fixes, thanks! [1/1] scsi: ufs: Fix divide zero case in ufshcd_map_queues() https://git.kernel.org/mkp/scsi/c/10af11564617
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 41d85b69fa50..36c5ca62ae0c 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -2674,21 +2674,21 @@ static int ufshcd_map_queues(struct Scsi_Host *shost) for (i = 0; i < shost->nr_maps; i++) { struct blk_mq_queue_map *map = &shost->tag_set.map[i]; switch (i) { case HCTX_TYPE_DEFAULT: case HCTX_TYPE_POLL: map->nr_queues = 1; break; case HCTX_TYPE_READ: map->nr_queues = 0; - break; + continue; default: WARN_ON_ONCE(true); } map->queue_offset = 0; ret = blk_mq_map_queues(map); WARN_ON_ONCE(ret); } return 0; }
Before calling blk_mq_map_queues(), the mq_map and nr_queues belonging to "struct blk_mq_queue_map" must be a vaild value. If nr_queues is set to 0, the system may encounter the "divide zero" depending on the type of architecture. blk_mq_map_queues() -> queue_index() Signed-off-by: Jinyoung Choi <j-young.choi@samsung.com> --- drivers/scsi/ufs/ufshcd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)