[PATCH V2 1/3] nvme: fix possible hang when removing a controller during error recovery

[Ming Lei]

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

Fix the issue by unquiescing controller unconditionally when removing
namespaces.

This way is reasonable and safe given forward progress can be made
when removing namespaces.

Reviewed-by: Keith Busch <kbusch at kernel.org>
Reviewed-by: Sagi Grimberg <sagi at grimberg.me>
Reported-by: Chunguang Xu <brookxu.cn at gmail.com>
Closes: https://lore.kernel.org/linux-nvme/cover.1685350577.git.chunguang.xu@shopee.com/
Cc: stable at vger.kernel.org
Signed-off-by: Ming Lei <ming.lei at redhat.com>
---
 drivers/nvme/host/core.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 47d7ba2827ff..98fa8315bc65 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3903,6 +3903,12 @@ 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);
 
@@ -3912,10 +3918,8 @@ void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
 	 * removing the namespaces' disks; fail all the queues now to avoid
 	 * potentially having to clean up the failed sync later.
 	 */
-	if (ctrl->state == NVME_CTRL_DEAD) {
+	if (ctrl->state == NVME_CTRL_DEAD)
 		nvme_mark_namespaces_dead(ctrl);
-		nvme_unquiesce_io_queues(ctrl);
-	}
 
 	/* this is a no-op when called from the controller reset handler */
 	nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING_NOIO);
-- 
2.40.1