Patch "nvmet-fc: correct ref counting error when deferred rcv used" has been added to the 4.14-stable tree

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

nvmet-fc: correct ref counting error when deferred rcv used

to the 4.14-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:
nvmet-fc-correct-ref-counting-error-when-deferred-rcv-used.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: James Smart <[email protected]>
Date: Fri, 10 Nov 2017 15:38:45 -0800
Subject: nvmet-fc: correct ref counting error when deferred rcv used

From: James Smart <[email protected]>

[ Upstream commit 619c62dcc62b957d17cccde2081cad527b020883 ]

Whenever a cmd is received a reference is taken while looking up the queue. The reference is removed after the cmd is done as the iod is returned for reuse. The fod may be reused for a deferred (recevied but no job context) cmd. Existing code removes the reference only if the fod is not reused for another command. Given the fod may be used for one or more ios, although a reference was taken per io, it won't be matched on the frees.

Remove the reference on every fod free. This pairs the references to each io.

---
 drivers/nvme/target/fc.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

@@ -532,15 +532,15 @@ nvmet_fc_free_fcp_iod(struct nvmet_fc_tg
 
 	tgtport->ops->fcp_req_release(&tgtport->fc_target_port, fcpreq);
 
+	/* release the queue lookup reference on the completed IO */
+	nvmet_fc_tgt_q_put(queue);
+
 	spin_lock_irqsave(&queue->qlock, flags);
 	deferfcp = list_first_entry_or_null(&queue->pending_cmd_list,
 				struct nvmet_fc_defer_fcp_req, req_list);
 	if (!deferfcp) {
 		list_add_tail(&fod->fcp_list, &fod->queue->fod_list);
 		spin_unlock_irqrestore(&queue->qlock, flags);
-
-		/* Release reference taken at queue lookup and fod allocation */
-		nvmet_fc_tgt_q_put(queue);
 		return;
 	}
 

@@ -759,6 +759,9 @@ nvmet_fc_delete_target_queue(struct nvme
 		tgtport->ops->fcp_req_release(&tgtport->fc_target_port,
 				deferfcp->fcp_req);
 
+		/* release the queue lookup reference */
+		nvmet_fc_tgt_q_put(queue);
+
 		kfree(deferfcp);
 
 		spin_lock_irqsave(&queue->qlock, flags);

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/nvmet-fc-correct-ref-counting-error-when-deferred-rcv-used.patch