linux-kernel - [PATCH] nvmet: switch loopback target state to connecting when resetting

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Date:   Thu,  3 May 2018 17:00:35 +0200
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Keith Busch <keith.busch@...el.com>
Cc:     Sagi Grimberg <sagi@...mberg.me>, Christoph Hellwig <hch@....de>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Linux NVMe Mailinglist <linux-nvme@...ts.infradead.org>,
        James Smart <james.smart@...adcom.com>,
        Johannes Thumshirn <jthumshirn@...e.de>
Subject: [PATCH] nvmet: switch loopback target state to connecting when resetting

After commit bb06ec31452f ("nvme: expand nvmf_check_if_ready checks")
resetting of the loopback nvme target failed as we forgot to switch
it's state to NVME_CTRL_CONNECTING before we reconnect the admin
queues. Therefore the checks in nvmf_check_if_ready() choose to go to
the reject_io case and thus we couldn't sent out an identify
controller command to reconnect.

Change the controller state to NVME_CTRL_CONNECTING after tearing down
the old connection and before re-establishing the connection.

Fixes: bb06ec31452f ("nvme: expand nvmf_check_if_ready checks")
Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
---
 drivers/nvme/target/loop.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
index 31fdfba556a8..27a8561c0cb9 100644
--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -469,6 +469,12 @@ static void nvme_loop_reset_ctrl_work(struct work_struct *work)
 	nvme_stop_ctrl(&ctrl->ctrl);
 	nvme_loop_shutdown_ctrl(ctrl);
 
+	if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
+		/* state change failure should never happen */
+		WARN_ON_ONCE(1);
+		return;
+	}
+
 	ret = nvme_loop_configure_admin_queue(ctrl);
 	if (ret)
 		goto out_disable;
-- 
2.16.3