Patch "nvme-tcp: add clean action for failed reconnection" has been added to the 5.4-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    nvme-tcp: add clean action for failed reconnection

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nvme-tcp-add-clean-action-for-failed-reconnection.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 634fad6238cd1945d0ddb311a575eb535fa08462
Author: Chao Leng <lengchao@xxxxxxxxxx>
Date:   Thu Jan 21 11:32:38 2021 +0800

    nvme-tcp: add clean action for failed reconnection
    
    [ Upstream commit 70a99574a79f1cd4dc7ad56ea37be40844bfb97b ]
    
    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@xxxxxxxxxx>
    Signed-off-by: Christoph Hellwig <hch@xxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index a554021e1ab9..77a3c488ec12 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -1710,8 +1710,10 @@ static int nvme_tcp_configure_io_queues(struct nvme_ctrl *ctrl, bool new)
 
 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:
@@ -1773,12 +1775,16 @@ static int nvme_tcp_configure_admin_queue(struct nvme_ctrl *ctrl, bool new)
 
 	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);
@@ -1892,10 +1898,18 @@ static int nvme_tcp_setup_ctrl(struct nvme_ctrl *ctrl, bool new)
 	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;
 }