netdev - [PATCH net-next] net: phy: check return code when requesting PHY driver module

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Message-ID: <7943c933-c353-1c0e-14c0-cdbb4d874d0a@gmail.com>
Date:   Tue, 15 Jan 2019 21:33:52 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next] net: phy: check return code when requesting PHY
 driver module

When requesting the PHY driver module fails we'll bind the genphy
driver later. This isn't obvious to the user and may cause, depending
on the PHY, different types of issues. Therefore check the return code
of request_module() and inform the user in case of failure.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/phy/phy_device.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index a2423cbb2..1527ed0f2 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -548,6 +548,17 @@ static const struct device_type mdio_bus_phy_type = {
 	.pm = MDIO_BUS_PHY_PM_OPS,
 };
 
+static void phy_request_driver_module(struct phy_device *dev, int phy_id)
+{
+	int ret;
+
+	ret = request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT,
+			     MDIO_ID_ARGS(phy_id));
+	if (IS_ENABLED(CONFIG_MODULES) && ret < 0)
+		phydev_err(dev, "error %d loading PHY driver module for ID 0x%08x\n",
+			   ret, phy_id);
+}
+
 struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
 				     bool is_c45,
 				     struct phy_c45_device_ids *c45_ids)
@@ -610,12 +621,10 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
 			if (!(c45_ids->devices_in_package & (1 << i)))
 				continue;
 
-			request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT,
-				       MDIO_ID_ARGS(c45_ids->device_ids[i]));
+			phy_request_driver_module(dev, c45_ids->device_ids[i]);
 		}
 	} else {
-		request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT,
-			       MDIO_ID_ARGS(phy_id));
+		phy_request_driver_module(dev, phy_id);
 	}
 
 	device_initialize(&mdiodev->dev);
-- 
2.20.1