r8169: improve error message if no dedicated PHY driver is found

There's a number of consumer mainboards where the BIOS leaves the PHY
in a state that it's reporting an invalid PHY ID. To detect such cases
add the PHY ID to the error message if no dedicated PHY driver is found.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/realtek/r8169_main.c

@@ -5197,7 +5197,8 @@ static int r8169_mdio_register(struct rtl8169_private *tp)
 		/* Most chip versions fail with the genphy driver.
 		 * Therefore ensure that the dedicated PHY driver is loaded.
 		 */
-		dev_err(&pdev->dev, "realtek.ko not loaded, maybe it needs to be added to initramfs?\n");
+		dev_err(&pdev->dev, "no dedicated PHY driver found for PHY ID 0x%08x, maybe realtek.ko needs to be added to initramfs?\n",
+			tp->phydev->phy_id);
 		return -EUNATCH;
 	}