[PATCH 1/2] nvme: core: unquiesce io queues when removing namespaces

[Ming Lei]

When error recovery is interrupted by controller removal, the controller
is left as quiesced, then IO hang can be caused.

Fix the issue by unquiescing controller unconditionally when removing
namespaces.

Reported-by: Chunguang Xu <brookxu.cn at gmail.com>
Closes: https://lore.kernel.org/linux-nvme/cover.1685350577.git.chunguang.xu@shopee.com/
Signed-off-by: Ming Lei <ming.lei at redhat.com>
---
 drivers/nvme/host/core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 3ec38e2b9173..4ef5eaecaa75 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4692,6 +4692,12 @@ void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
 	 */
 	nvme_mpath_clear_ctrl_paths(ctrl);
 
+	/*
+	 * Unquiesce io queues so any pending IO won't hang, especially
+	 * those submitted from scan work
+	 */
+	nvme_unquiesce_io_queues(ctrl);
+
 	/* prevent racing with ns scanning */
 	flush_work(&ctrl->scan_work);
 
-- 
2.40.1