linux-kernel - [PATCH] net: mdio: fix duplicate registrations for phy with c45 in __of_mdiobus

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Message-Id: <20230610161308.3158-1-zhaojh329@gmail.com>
Date:   Sun, 11 Jun 2023 00:13:08 +0800
From:   Jianhui Zhao <zhaojh329@...il.com>
To:     andrew@...n.ch, hkallweit1@...il.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jianhui Zhao <zhaojh329@...il.com>
Subject: [PATCH] net: mdio: fix duplicate registrations for phy with c45 in __of_mdiobus_register()

Maybe mdiobus_scan_bus_c45() is called in __mdiobus_register().
Thus it should skip already registered PHYs later.

Signed-off-by: Jianhui Zhao <zhaojh329@...il.com>
---
 drivers/net/mdio/of_mdio.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c
index 7eb32ebb846d..441973fce79e 100644
--- a/drivers/net/mdio/of_mdio.c
+++ b/drivers/net/mdio/of_mdio.c
@@ -186,6 +186,10 @@ int __of_mdiobus_register(struct mii_bus *mdio, struct device_node *np,
 			continue;
 		}
 
+		/* skip already registered PHYs */
+		if (mdiobus_is_registered_device(mdio, addr))
+			continue;
+
 		if (of_mdiobus_child_is_phy(child))
 			rc = of_mdiobus_register_phy(mdio, child, addr);
 		else
-- 
2.34.1