[PATCH 5.6 06/29] net: macb: Fix handling of fixed-link node

[Greg Kroah-Hartman]

From: Codrin Ciubotariu <codrin.ciubotariu@xxxxxxxxxxxxx>

[ Upstream commit 79540d133ed6f65a37dacb54b7a704cc8a24c52d ]

fixed-link nodes are treated as PHY nodes by of_mdiobus_child_is_phy().
We must check if the interface is a fixed-link before looking up for PHY
nodes.

Fixes: 7897b071ac3b ("net: macb: convert to phylink")
Tested-by: Cristian Birsan <cristian.birsan@xxxxxxxxxxxxx>
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/cadence/macb_main.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -724,6 +724,9 @@ static int macb_mdiobus_register(struct
 {
 	struct device_node *child, *np = bp->pdev->dev.of_node;
 
+	if (of_phy_is_fixed_link(np))
+		return mdiobus_register(bp->mii_bus);
+
 	/* Only create the PHY from the device tree if at least one PHY is
 	 * described. Otherwise scan the entire MDIO bus. We do this to support
 	 * old device tree that did not follow the best practices and did not