Patch "of_mdio: avoid MDIO bus removal when a PHY is missing" has been added to the 4.14-stable tree

Patch "of_mdio: avoid MDIO bus removal when a PHY is missing" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    of_mdio: avoid MDIO bus removal when a PHY is missing

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     of_mdio-avoid-mdio-bus-removal-when-a-phy-is-missing.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Feb 28 16:23:28 CET 2018
From: Madalin Bucur <madalin.bucur@nxp.com>
Date: Tue, 9 Jan 2018 14:43:34 +0200
Subject: of_mdio: avoid MDIO bus removal when a PHY is missing

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;
 			}
 		}


Patches currently in stable-queue which might be from madalin.bucur@nxp.com are

queue-4.14/of_mdio-avoid-mdio-bus-removal-when-a-phy-is-missing.patch