Thread (29 messages) 29 messages, 6 authors, 2021-08-18

Re: [PATCH v4 4/8] nvme-fc: Wait with a timeout for queue to freeze

From: Himanshu Madhani <hidden>
Date: 2021-08-02 19:36:47
Also in: lkml


On 8/2/21 6:26 AM, Daniel Wagner wrote:
quoted hunk ↗ jump to hunk
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 <redacted>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Daniel Wagner <redacted>
---
  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 8a903769364f..dbb8ad816df8 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: Himanshu Madhani <redacted>

-- 
Himanshu Madhani                                Oracle Linux Engineering

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