linux-kernel - [PATCH v2 5/5] nvme-fc: Freeze queues before destroying them

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Date:   Thu,  8 Jul 2021 11:27:55 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     linux-nvme@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org,
        James Smart <james.smart@...adcom.com>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Ming Lei <ming.lei@...hat.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Daniel Wagner <dwagner@...e.de>
Subject: [PATCH v2 5/5] nvme-fc: Freeze queues before destroying them

nvme_wait_freeze_timeout() in nvme_fc_recreate_io_queues() needs to be
paired with a nvme_start_freeze(). Without freezing first we will always
timeout in nvme_wait_freeze_timeout().

Note there is a similiar fix for RDMA 9f98772ba307 ("nvme-rdma: fix
controller reset hang during traffic") which happens to follow the PCI
strategy how to handle resetting the queues.

Signed-off-by: Daniel Wagner <dwagner@...e.de>
---
 drivers/nvme/host/fc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 8e1fc3796735..a38b01485939 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -3249,6 +3249,7 @@ nvme_fc_delete_association(struct nvme_fc_ctrl *ctrl)
 		nvme_fc_xmt_ls_rsp(disls);
 
 	if (ctrl->ctrl.tagset) {
+		nvme_start_freeze(&ctrl->ctrl);
 		nvme_fc_delete_hw_io_queues(ctrl);
 		nvme_fc_free_io_queues(ctrl);
 	}
-- 
2.29.2