Now we setup q->nr_requests when switching to one new scheduler,
but not do it for 'none', then q->nr_requests may not be correct
for 'none'.

This patch fixes this issue by always updating 'nr_requests' when
switching to 'none'.

Cc: Marco Patalano <[email protected]>
Cc: "Ewan D. Milne" <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
---
 block/blk-mq-sched.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index b0f2c2a40a0c..b087d8884a08 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -585,6 +585,7 @@ int blk_mq_init_sched(struct request_queue *q, struct 
elevator_type *e)
 
        if (!e) {
                q->elevator = NULL;
+               q->nr_requests = q->tag_set->queue_depth;
                return 0;
        }
 
-- 
2.9.5

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