linux-kernel - [PATCH v2 11/15] nvmet-fc: free pending reqs on tgtport unregister

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Message-Id: <20250311-nvmet-fcloop-v2-11-fc40cb64edea@kernel.org>
Date: Tue, 11 Mar 2025 11:11:37 +0100
From: Daniel Wagner <wagi@...nel.org>
To: James Smart <james.smart@...adcom.com>, Christoph Hellwig <hch@....de>, 
 Sagi Grimberg <sagi@...mberg.me>, Chaitanya Kulkarni <kch@...dia.com>
Cc: Hannes Reinecke <hare@...e.de>, Keith Busch <kbusch@...nel.org>, 
 linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Daniel Wagner <wagi@...nel.org>
Subject: [PATCH v2 11/15] nvmet-fc: free pending reqs on tgtport unregister

When nvmet_fc_unregister_targetport is called by the LLDD, it's not
possible to communicate with the host, thus all pending request will not
be process. Thus explicitly free them.

Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Daniel Wagner <wagi@...nel.org>
---
 drivers/nvme/target/fc.c | 39 ++++++++++++++++++++++++++++++++-------
 1 file changed, 32 insertions(+), 7 deletions(-)

diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
index 810aff9901da725086f8bd76f3320fb31696468f..c579810f0225eedaadf84eb24e1d890629327623 100644
--- a/drivers/nvme/target/fc.c
+++ b/drivers/nvme/target/fc.c
@@ -1616,6 +1616,37 @@ nvmet_fc_delete_ctrl(struct nvmet_ctrl *ctrl)
 	spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags);
 }
 
+static void
+nvmet_fc_free_pending_reqs(struct nvmet_fc_tgtport *tgtport)
+{
+	struct nvmet_fc_ls_req_op *lsop;
+	struct nvmefc_ls_req *lsreq;
+
+	/*
+	 * After this point the connection is lost and thus any pending
+	 * request can't be processed by the normal completion path. This
+	 * is likely a request from nvmet_fc_send_ls_req_async.
+	 */
+	for (;;) {
+		lsop = list_first_entry_or_null(&tgtport->ls_req_list,
+						struct nvmet_fc_ls_req_op,
+						lsreq_list);
+		if (!lsop)
+			break;
+
+		list_del(&lsop->lsreq_list);
+
+		if (!lsop->req_queued)
+			continue;
+
+		lsreq = &lsop->ls_req;
+		fc_dma_unmap_single(tgtport->dev, lsreq->rqstdma,
+				    (lsreq->rqstlen + lsreq->rsplen),
+				    DMA_BIDIRECTIONAL);
+		nvmet_fc_tgtport_put(tgtport);
+	}
+}
+
 /**
  * nvmet_fc_unregister_targetport - transport entry point called by an
  *                              LLDD to deregister/remove a previously
@@ -1639,13 +1670,7 @@ nvmet_fc_unregister_targetport(struct nvmet_fc_target_port *target_port)
 
 	flush_workqueue(nvmet_wq);
 
-	/*
-	 * should terminate LS's as well. However, LS's will be generated
-	 * at the tail end of association termination, so they likely don't
-	 * exist yet. And even if they did, it's worthwhile to just let
-	 * them finish and targetport ref counting will clean things up.
-	 */
-
+	nvmet_fc_free_pending_reqs(tgtport);
 	nvmet_fc_tgtport_put(tgtport);
 
 	return 0;

-- 
2.48.1