of_mdio: avoid MDIO bus removal when a PHY is missing

If one of the child devices is missing the of_mdiobus_register_phy()
call will return -ENODEV. When a missing device is encountered the
registration of the remaining PHYs is stopped and the MDIO bus will
fail to register. Propagate all errors except ENODEV to avoid it.

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 3481e69738b5..a327be1d264b 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -231,7 +231,12 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
                         rc = of_mdiobus_register_phy(mdio, child, addr);
                 else
                         rc = of_mdiobus_register_device(mdio, child, addr);
-                if (rc)
+
+                if (rc == -ENODEV)
+                        dev_err(&mdio->dev,
+                                "MDIO device at address %d is missing.\n",
+                                addr);
+                else if (rc)
                         goto unregister;
         }
 
@@ -255,7 +260,7 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
 
                         if (of_mdiobus_child_is_phy(child)) {
                                 rc = of_mdiobus_register_phy(mdio, child, addr);
-                                if (rc)
+                                if (rc && rc != -ENODEV)
                                         goto unregister;
                         }
                 }