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Subject[PATCH 4.14 105/115] of_mdio: avoid MDIO bus removal when a PHY is missing
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Madalin Bucur <madalin.bucur@nxp.com>


[ Upstream commit 95f566de0269a0c59fd6a737a147731302136429 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/of/of_mdio.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -228,7 +228,12 @@ int of_mdiobus_register(struct mii_bus *
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;
}

@@ -252,7 +257,7 @@ int of_mdiobus_register(struct mii_bus *

if (of_mdiobus_child_is_phy(child)) {
rc = of_mdiobus_register_phy(mdio, child, addr);
- if (rc)
+ if (rc && rc != -ENODEV)
goto unregister;
}
}

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