[PATCH v2 6/8] nbd: quiesce request queues to make sure no submissions are inflight
From: Sagi Grimberg <sagi@grimberg.me>
Date: 2017-07-05 06:53:09
Also in:
linux-nvme
Subsystem:
block layer, network block device (nbd), the rest · Maintainers:
Jens Axboe, Josef Bacik, Linus Torvalds
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 <redacted> Cc: Josef Bacik <redacted> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> --- drivers/block/nbd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 977ec960dd2f..dea7d85134ee 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c@@ -661,9 +661,9 @@ 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"); }
--
2.7.4