block: add BLK_MQ_POLL_CLASSIC for hybrid poll and return EINVAL for unexpected value
For q->poll_nsec == -1, means doing classic poll, not hybrid poll.
We introduce a new flag BLK_MQ_POLL_CLASSIC to replace -1, which
may make code much easier to read.
Additionally, since val is an int obtained with kstrtoint(), val can be
a negative value other than -1, so return -EINVAL for that case.
Thanks to Damien Le Moal for some good suggestion.
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/blk-mq.c b/block/blk-mq.c
index ea01c23..76a3f78 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2856,7 +2856,7 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
/*
* Default to classic polling
*/
- q->poll_nsec = -1;
+ q->poll_nsec = BLK_MQ_POLL_CLASSIC;
blk_mq_init_cpu_queues(q, set->nr_hw_queues);
blk_mq_add_queue_tag_set(set, q);
@@ -3391,7 +3391,7 @@ static bool blk_mq_poll_hybrid(struct request_queue *q,
{
struct request *rq;
- if (q->poll_nsec == -1)
+ if (q->poll_nsec == BLK_MQ_POLL_CLASSIC)
return false;
if (!blk_qc_t_is_internal(cookie))