linux-kernel - [PATCH v4 05/14] nvmet-fcloop: update refs on tfcp

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Message-Id: <20250410-nvmet-fcloop-v4-5-7e5c42b7b2cb@kernel.org>
Date: Thu, 10 Apr 2025 13:41:08 +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 v4 05/14] 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.

Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: Daniel Wagner <wagi@...nel.org>
---
 drivers/nvme/target/fcloop.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c
index 1a8ae33c1699be3b7a2a7170dff77e324c127ebb..b54467b285181d6909c6592eb166cf4fe6fbe54c 100644
--- a/drivers/nvme/target/fcloop.c
+++ b/drivers/nvme/target/fcloop.c
@@ -566,7 +566,8 @@ 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;
@@ -671,6 +672,7 @@ 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;
 	}
@@ -958,8 +960,10 @@ 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)

-- 
2.49.0