netdev - [PATCH net] of_mdio: avoid MDIO bus removal when a PHY is missing

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Date:   Fri, 5 Jan 2018 11:36:14 +0200
From:   Madalin Bucur <madalin.bucur@....com>
To:     <andrew@...n.ch>, <f.fainelli@...il.com>, <davem@...emloft.net>
CC:     <geert+renesas@...der.be>, <robh+dt@...nel.org>,
        <frowand.list@...il.com>, <netdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Madalin Bucur <madalin.bucur@....com>
Subject: [PATCH net] 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@....com>
---
 drivers/of/of_mdio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 3481e69..93d41275 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -231,7 +231,7 @@ 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 && rc != -ENODEV)
 			goto unregister;
 	}
 
@@ -255,7 +255,7 @@ 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;
 			}
 		}
-- 
2.1.0