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[B,1/2] block: avoid setting nr_requests to current value

Message ID 20190424102331.31624-2-kai.heng.feng@canonical.com
State New
Headers show
Series Fix for LP: #1815733 | expand

Commit Message

Kai-Heng Feng April 24, 2019, 10:23 a.m. UTC 
From: Aleksei Zakharov <zakharov.a.g@yandex.ru>

BugLink: https://bugs.launchpad.net/bugs/1815733

There's no reason to freeze queue and set nr_requests value
if current value is the same.

Signed-off-by: Aleksei Zakharov <zakharov.a.g@yandex.ru>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
(backported from commit e5fa81408fb43ebabde65938ef8b20ae879017e7)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 block/blk-mq.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 2f8436314985..67a80fd597e1 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2792,6 +2792,9 @@  int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr)
 	if (!set)
 		return -EINVAL;
 
+	if (q->nr_requests == nr)
+		return 0;
+
 	blk_mq_freeze_queue(q);
 
 	ret = 0;