linux-kernel - [PATCH v2 07/15] nvmet-fcloop: update refs on tfcp

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Message-Id: <20250311-nvmet-fcloop-v2-7-fc40cb64edea@kernel.org>
Date: Tue, 11 Mar 2025 11:11:33 +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 07/15] nvmet-fcloop: update refs on tfcp_req

Track the lifetime of the in-flight tfcp_req to ensure
the object is not freed too early.

Signed-off-by: Daniel Wagner <wagi@...nel.org>
---
 drivers/nvme/target/fcloop.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c
index 2ad213c9041ee19893b2f7e8d8c82119ba412a46..4ba75f7f51e0bd95ab806b6e82452e75593ff0cf 100644
--- a/drivers/nvme/target/fcloop.c
+++ b/drivers/nvme/target/fcloop.c
@@ -567,7 +567,8 @@ fcloop_call_host_done(struct nvmefc_fcp_req *fcpreq,
 	}
 
 	/* release original io reference on tgt struct */
-	fcloop_tfcp_req_put(tfcp_req);
+	if (tfcp_req)
+		fcloop_tfcp_req_put(tfcp_req);
 }
 
 static bool drop_fabric_opcode;
@@ -672,6 +673,7 @@ fcloop_fcp_abort_recv_work(struct work_struct *work)
 		break;
 	default:
 		spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
+		fcloop_tfcp_req_put(tfcp_req);
 		WARN_ON(1);
 		return;
 	}
@@ -930,6 +932,8 @@ fcloop_fcp_req_release(struct nvmet_fc_target_port *tgtport,
 {
 	struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq);
 
+	if (!fcloop_tfcp_req_get(tfcp_req))
+		return;
 	queue_work(nvmet_wq, &tfcp_req->tio_done_work);
 }
 
@@ -959,8 +963,10 @@ fcloop_fcp_abort(struct nvme_fc_local_port *localport,
 
 	spin_lock(&inireq->inilock);
 	tfcp_req = inireq->tfcp_req;
-	if (tfcp_req)
-		fcloop_tfcp_req_get(tfcp_req);
+	if (tfcp_req) {
+		if (!fcloop_tfcp_req_get(tfcp_req))
+			tfcp_req = NULL;
+	}
 	spin_unlock(&inireq->inilock);
 
 	if (!tfcp_req)

-- 
2.48.1