Re: [PATCH 2/2] nvme-fc: Wait with a timeout for queue to freeze

From: Hannes Reinecke
Date: Tue Jun 29 2021 - 08:31:56 EST


On 6/25/21 12:16 PM, Daniel Wagner wrote:
Do not wait indifinitly for all queues to freeze. Instead use a
timeout and abort the operation if we get stuck.

Signed-off-by: Daniel Wagner <dwagner@xxxxxxx>
---
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 a9645cd89eca..d8db85aa5417 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -2955,7 +2955,14 @@ 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);
}

Reviewed-by: Hannes Reinecke <hare@xxxxxxx>

Cheers,

Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
hare@xxxxxxx +49 911 74053 688
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