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

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Date:   Sun, 11 Jun 2023 16:58:26 +0800
From:   Jianhui Zhao <zhaojh329@...il.com>
To:     zhaojh329@...il.com
Cc:     andrew@...n.ch, davem@...emloft.net, edumazet@...gle.com,
        hkallweit1@...il.com, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com
Subject: [PATCH] net: mdio: fix duplicate registrations for phy with c45 in __of_mdiobus_register()

__of_mdiobus_register
    __mdiobus_register
        mdiobus_scan_bus_c45
    of_mdiobus_child_is_phy
        of_mdiobus_register_phy
            fwnode_mdiobus_register_phy
                is_c45 = fwnode_device_is_compatible(child, "ethernet-phy-ieee802.3-c45");
                    get_phy_device
						phy_device_create

This is the function call chain. If a phy is already registered in
mdiobus_scan_bus_c45(), and it's compatible "ethernet-phy-ieee802.3-c45",
thus it will duplicated call get_phy_device later.