[PATCH V2] nvme: don't wait freeze during resetting

[Ming Lei]

First it isn't necessary to call nvme_wait_freeze during reset.
For nvme-pci, if tagset isn't allocated, there can't be any inflight
IOs; otherwise blk_mq_update_nr_hw_queues can freeze & wait queues.

Second, since commit bdd6316094e0 ("block: Allow unfreezing of a queue
while requests are in progress"), it is fine to unfreeze queue without
draining inflight IOs.

Reviewed-by: Sagi Grimberg <sagi at grimberg.me>
Reviewed-by: Chao Leng <lengchao at huawei.com>
Reviewed-by: Keith Busch <kbusch at kernel.org>
Signed-off-by: Ming Lei <ming.lei at redhat.com>
---
V2:
	- remove the change in rdma/tcp which may make non-mpath reset
	time much longer, as pointed by Sagi

 drivers/nvme/host/apple.c | 1 -
 drivers/nvme/host/pci.c   | 1 -
 2 files changed, 2 deletions(-)

diff --git a/drivers/nvme/host/apple.c b/drivers/nvme/host/apple.c
index 5fc5ea196b40..9cd02b57fc85 100644
--- a/drivers/nvme/host/apple.c
+++ b/drivers/nvme/host/apple.c
@@ -1126,7 +1126,6 @@ static void apple_nvme_reset_work(struct work_struct *work)
 	anv->ctrl.queue_count = nr_io_queues + 1;
 
 	nvme_start_queues(&anv->ctrl);
-	nvme_wait_freeze(&anv->ctrl);
 	blk_mq_update_nr_hw_queues(&anv->tagset, 1);
 	nvme_unfreeze(&anv->ctrl);
 
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 98864b853eef..985b216907fc 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2910,7 +2910,6 @@ static void nvme_reset_work(struct work_struct *work)
 		nvme_free_tagset(dev);
 	} else {
 		nvme_start_queues(&dev->ctrl);
-		nvme_wait_freeze(&dev->ctrl);
 		if (!dev->ctrl.tagset)
 			nvme_pci_alloc_tag_set(dev);
 		else
-- 
2.31.1