[rh7,2/2] nbd: quiesce request queues to make sure no submissions are inflight

Submitted by Andrey Ryabinin on Nov. 6, 2019, 9:48 a.m.


Message ID 20191106094841.8419-2-aryabinin@virtuozzo.com
State New
Series "Series without cover letter"
Headers show

Commit Message

Andrey Ryabinin Nov. 6, 2019, 9:48 a.m.
From: Sagi Grimberg <sagi@grimberg.me>

Unlike blk_mq_stop_hw_queues, blk_mq_quiesce_queue respects the
submission path rcu grace. quiesce the queue before iterating
on live tags.

Reviewed-by: Ming Lei <ming.lei@redhat.com>
Acked-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>

(cherry picked from commit b52c2e92546ee794a5bbab4d8ea435c1de85a8cb)
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
 drivers/block/nbd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 8e43eac169f4..4a17d320d7fa 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -642,9 +642,9 @@  static void nbd_clear_req(struct request *req, void *data, bool reserved)
 static void nbd_clear_que(struct nbd_device *nbd)
-	blk_mq_stop_hw_queues(nbd->disk->queue);
+	blk_mq_quiesce_queue(nbd->disk->queue);
 	blk_mq_tagset_busy_iter(&nbd->tag_set, nbd_clear_req, NULL);
-	blk_mq_start_hw_queues(nbd->disk->queue);
+	blk_mq_unquiesce_queue(nbd->disk->queue);
 	dev_dbg(disk_to_dev(nbd->disk), "queue cleared\n");