linux-kernel - [PATCH v5 1/3] nvme-fc: Wait with a timeout for queue to freeze

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Message-Id: <20210818120530.130501-2-dwagner@suse.de>
Date:   Wed, 18 Aug 2021 14:05:28 +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>,
        Ming Lei <ming.lei@...hat.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Hannes Reinecke <hare@...e.de>,
        Wen Xiong <wenxiong@...ibm.com>,
        Himanshu Madhani <himanshu.madhani@...cle.com>,
        Daniel Wagner <dwagner@...e.de>,
        James Smart <jsmart2021@...il.com>
Subject: [PATCH v5 1/3] nvme-fc: Wait with a timeout for queue to freeze

Do not wait indifinitly for all queues to freeze. Instead use a
timeout and abort the operation if we get stuck.

Reviewed-by: James Smart <jsmart2021@...il.com>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Daniel Wagner <dwagner@...e.de>
---
 drivers/nvme/host/fc.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 7f462af1b02a..8e59e6d142c1 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -2963,7 +2963,14 @@ nvme_fc_recreate_io_queues(struct nvme_fc_ctrl *ctrl)
 		dev_info(ctrl->ctrl.device,
 			"reconnect: revising io queue count from %d to %d\n",
 			prior_ioq_cnt, nr_io_queues);
-		nvme_wait_freeze(&ctrl->ctrl);
+		if (!nvme_wait_freeze_timeout(&ctrl->ctrl, NVME_IO_TIMEOUT)) {
+			/*
+			 * If we timed out waiting for freeze we are likely to
+			 * be stuck.  Fail the controller initialization just
+			 * to be safe.
+			 */
+			return -ENODEV;
+		}
 		blk_mq_update_nr_hw_queues(&ctrl->tag_set, nr_io_queues);
 		nvme_unfreeze(&ctrl->ctrl);
 	}
-- 
2.29.2