linux-kernel - [PATCH AUTOSEL 4.14 40/67] nvme-rdma: unquiesce queues when deleting the controller

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Date:   Fri, 7 Sep 2018 00:37:51 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Sagi Grimberg <sagi@...mberg.me>, Christoph Hellwig <hch@....de>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.14 40/67] nvme-rdma: unquiesce queues when deleting
 the controller

From: Sagi Grimberg <sagi@...mberg.me>

[ Upstream commit 90140624e8face94207003ac9a9d2a329b309d68 ]

If the controller is going away, we need to unquiesce the IO queues so
that all pending request can fail gracefully before moving forward with
controller deletion. Do that before we destroy the IO queues so
blk_cleanup_queue won't block in freeze.

Signed-off-by: Sagi Grimberg <sagi@...mberg.me>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/nvme/host/rdma.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 48a831d58e7a..9fffe41ead50 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -1728,6 +1728,8 @@ static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
 		nvme_stop_queues(&ctrl->ctrl);
 		blk_mq_tagset_busy_iter(&ctrl->tag_set,
 					nvme_cancel_request, &ctrl->ctrl);
+		if (shutdown)
+			nvme_start_queues(&ctrl->ctrl);
 		nvme_rdma_destroy_io_queues(ctrl, shutdown);
 	}
 
-- 
2.17.1