netdev - [PATCH] ftgmac100: Hold reference returned by of_get_child_by

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Message-Id: <20220704151819.279513-1-windhl@126.com>
Date:   Mon,  4 Jul 2022 23:18:19 +0800
From:   Liang He <windhl@....com>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, windhl@....com, netdev@...r.kernel.org
Subject: [PATCH] ftgmac100: Hold reference returned by of_get_child_by_name()

In ftgmac100_probe(), we should hold the refernece returned by
of_get_child_by_name() and use it to call of_node_put() for
reference balance.

Signed-off-by: Liang He <windhl@....com>
---
 drivers/net/ethernet/faraday/ftgmac100.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 5231818943c6..e50bd7beb09b 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -1770,7 +1770,7 @@ static int ftgmac100_probe(struct platform_device *pdev)
 	int irq;
 	struct net_device *netdev;
 	struct ftgmac100 *priv;
-	struct device_node *np;
+	struct device_node *np, *child_np;
 	int err = 0;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -1883,7 +1883,7 @@ static int ftgmac100_probe(struct platform_device *pdev)
 
 		/* Display what we found */
 		phy_attached_info(phy);
-	} else if (np && !of_get_child_by_name(np, "mdio")) {
+	} else if (np && !(child_np = of_get_child_by_name(np, "mdio"))) {
 		/* Support legacy ASPEED devicetree descriptions that decribe a
 		 * MAC with an embedded MDIO controller but have no "mdio"
 		 * child node. Automatically scan the MDIO bus for available
@@ -1901,6 +1901,8 @@ static int ftgmac100_probe(struct platform_device *pdev)
 		}
 
 	}
+	if (child_np)
+		of_node_put(child_np);
 
 	if (priv->is_aspeed) {
 		err = ftgmac100_setup_clk(priv);
-- 
2.25.1