linux-kernel - [PATCH 5.15 080/177] net: dsa: Add missing of_node_put() in dsa_port_link_register

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Date:   Wed,  4 May 2022 18:44:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miaoqian Lin <linmq006@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 080/177] net: dsa: Add missing of_node_put() in dsa_port_link_register_of

From: Miaoqian Lin <linmq006@...il.com>

[ Upstream commit fc06b2867f4cea543505acfb194c2be4ebf0c7d3 ]

The device_node pointer is returned by of_parse_phandle()  with refcount
incremented. We should use of_node_put() on it when done.
of_node_put() will check for NULL value.

Fixes: a20f997010c4 ("net: dsa: Don't instantiate phylink for CPU/DSA ports unless needed")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/dsa/port.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/dsa/port.c b/net/dsa/port.c
index 616330a16d31..63e88de96393 100644
--- a/net/dsa/port.c
+++ b/net/dsa/port.c
@@ -1201,8 +1201,10 @@ int dsa_port_link_register_of(struct dsa_port *dp)
 			if (ds->ops->phylink_mac_link_down)
 				ds->ops->phylink_mac_link_down(ds, port,
 					MLO_AN_FIXED, PHY_INTERFACE_MODE_NA);
+			of_node_put(phy_np);
 			return dsa_port_phylink_register(dp);
 		}
+		of_node_put(phy_np);
 		return 0;
 	}
 
-- 
2.35.1