From mboxrd@z Thu Jan 1 00:00:00 1970 From: Madalin Bucur Subject: [PATCH net, v2] of_mdio: avoid MDIO bus removal when a PHY is missing Date: Tue, 9 Jan 2018 10:33:39 +0200 Message-ID: <1515486819-8954-1-git-send-email-madalin.bucur@nxp.com> Reply-To: Mime-Version: 1.0 Content-Type: text/plain Return-path: Sender: linux-kernel-owner@vger.kernel.org To: andrew@lunn.ch, f.fainelli@gmail.com, davem@davemloft.net Cc: geert+renesas@glider.be, robh+dt@kernel.org, frowand.list@gmail.com, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Madalin Bucur List-Id: devicetree@vger.kernel.org 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 --- v2: add an error print for the first change; the second place has some noise aleady generated by the exing code drivers/of/of_mdio.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c index 3481e69..a249370 100644 --- a/drivers/of/of_mdio.c +++ b/drivers/of/of_mdio.c @@ -231,8 +231,14 @@ 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) - goto unregister; + + if (rc == -ENODEV) + dev_err(&mdio->dev, + "MDIO device at address %d is missing.\n", + addr); + else + if (rc) + goto unregister; } if (!scanphys) @@ -255,7 +261,7 @@ 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