From: Chao Leng <lengchao@huawei.com>
Date: Thu, 21 Jan 2021 11:32:38 +0800
Subject: nvme-tcp: add clean action for failed reconnection
Patch-mainline: v5.12-rc1
Git-commit: 70a99574a79f1cd4dc7ad56ea37be40844bfb97b
References: bsc#1183976

If reconnect failed after start io queues, the queues will be unquiesced
and new requests continue to be delivered. Reconnection error handling
process directly free queues without cancel suspend requests. The
suppend request will time out, and then crash due to use the queue
after free.

Add sync queues and cancel suppend requests for reconnection error
handling.

Signed-off-by: Chao Leng <lengchao@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
 drivers/nvme/host/tcp.c |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1838,8 +1838,10 @@ static int nvme_tcp_configure_io_queues(
 
 out_wait_freeze_timed_out:
 	nvme_stop_queues(ctrl);
+	nvme_sync_io_queues(ctrl);
 	nvme_tcp_stop_io_queues(ctrl);
 out_cleanup_connect_q:
+	nvme_cancel_tagset(ctrl);
 	if (new)
 		blk_cleanup_queue(ctrl->connect_q);
 out_free_tag_set:
@@ -1901,12 +1903,16 @@ static int nvme_tcp_configure_admin_queu
 
 	error = nvme_init_identify(ctrl);
 	if (error)
-		goto out_stop_queue;
+		goto out_quiesce_queue;
 
 	return 0;
 
+out_quiesce_queue:
+	blk_mq_quiesce_queue(ctrl->admin_q);
+	blk_sync_queue(ctrl->admin_q);
 out_stop_queue:
 	nvme_tcp_stop_queue(ctrl, 0);
+	nvme_cancel_admin_tagset(ctrl);
 out_cleanup_queue:
 	if (new)
 		blk_cleanup_queue(ctrl->admin_q);
@@ -2025,10 +2031,18 @@ static int nvme_tcp_setup_ctrl(struct nv
 	return 0;
 
 destroy_io:
-	if (ctrl->queue_count > 1)
+	if (ctrl->queue_count > 1) {
+		nvme_stop_queues(ctrl);
+		nvme_sync_io_queues(ctrl);
+		nvme_tcp_stop_io_queues(ctrl);
+		nvme_cancel_tagset(ctrl);
 		nvme_tcp_destroy_io_queues(ctrl, new);
+	}
 destroy_admin:
+	blk_mq_quiesce_queue(ctrl->admin_q);
+	blk_sync_queue(ctrl->admin_q);
 	nvme_tcp_stop_queue(ctrl, 0);
+	nvme_cancel_admin_tagset(ctrl);
 	nvme_tcp_destroy_admin_queue(ctrl, new);
 	return ret;
 }