diff --git a/target/linux/realtek/files-6.18/drivers/net/mdio/mdio-realtek-otto.c b/target/linux/realtek/files-6.18/drivers/net/mdio/mdio-realtek-otto.c
index d604185d10..338118faea 100644
--- a/target/linux/realtek/files-6.18/drivers/net/mdio/mdio-realtek-otto.c
+++ b/target/linux/realtek/files-6.18/drivers/net/mdio/mdio-realtek-otto.c
@@ -185,6 +185,7 @@ struct rtmdio_port {
 
 struct rtmdio_bus {
 	bool is_c45;
+	struct mii_bus *mii_bus;
 };
 
 struct rtmdio_ctrl {
@@ -198,6 +199,7 @@ struct rtmdio_ctrl {
 
 struct rtmdio_chan {
 	struct rtmdio_ctrl *ctrl;
+	u8 smi_bus;
 };
 
 struct rtmdio_config {
@@ -947,6 +949,9 @@ static int rtmdio_probe_one(struct device *dev, struct rtmdio_ctrl *ctrl)
 	chan = bus->priv;
 	chan->ctrl = ctrl;
 
+	chan->smi_bus = 0;
+	ctrl->bus[0].mii_bus = bus;
+
 	bus->name = "Realtek MDIO bus";
 	bus->reset = rtmdio_reset;
 	bus->read = rtmdio_read;