linux-kernel - [PATCH v6 11/14] nvmet-fcloop: drop response if targetport is gone

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Message-Id: <20250507-nvmet-fcloop-v6-11-ca02e16fb018@kernel.org>
Date: Wed, 07 May 2025 14:23:07 +0200
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 v6 11/14] nvmet-fcloop: drop response if targetport is gone

When the target port is gone, the lsrsp pointer is invalid. Thus don't
call the done function anymore instead just drop the response.

This happens when the target sends a disconnect association. After this
the target starts tearing down all resources and doesn't expect any
response.

Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Daniel Wagner <wagi@...nel.org>
---
 drivers/nvme/target/fcloop.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c
index fc10d380c17e77ed35706ddd7690e6f6a8d268c6..83edfd48c30db36a755b9dc7af6605236dc67231 100644
--- a/drivers/nvme/target/fcloop.c
+++ b/drivers/nvme/target/fcloop.c
@@ -493,16 +493,25 @@ fcloop_t2h_xmt_ls_rsp(struct nvme_fc_local_port *localport,
 	struct nvmet_fc_target_port *targetport = rport->targetport;
 	struct fcloop_tport *tport;
 
-	memcpy(lsreq->rspaddr, lsrsp->rspbuf,
-		((lsreq->rsplen < lsrsp->rsplen) ?
-				lsreq->rsplen : lsrsp->rsplen));
-	lsrsp->done(lsrsp);
-
 	if (!targetport) {
+		/*
+		 * The target port is gone. The target doesn't expect any
+		 * response anymore and the ->done call is not valid
+		 * because the resources have been freed by
+		 * nvmet_fc_free_pending_reqs.
+		 *
+		 * We end up here from delete association exchange:
+		 * nvmet_fc_xmt_disconnect_assoc sends an async request.
+		 */
 		kmem_cache_free(lsreq_cache, tls_req);
 		return 0;
 	}
 
+	memcpy(lsreq->rspaddr, lsrsp->rspbuf,
+		((lsreq->rsplen < lsrsp->rsplen) ?
+				lsreq->rsplen : lsrsp->rsplen));
+	lsrsp->done(lsrsp);
+
 	tport = targetport->private;
 	spin_lock(&tport->lock);
 	list_add_tail(&tls_req->ls_list, &tport->ls_list);

-- 
2.49.0