net: mdio-ipq4019: add missing error check

If an optional resource is found but fails to remap, return on failure.
Avoids any potential problems when using the iomapped resource as the
assumption is that it's available.

Fixes: 23a890d493e3 ("net: mdio: Add the reset function for IPQ MDIO driver")
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20241121193152.8966-1-rosenp@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/mdio/mdio-ipq4019.c b/drivers/net/mdio/mdio-ipq4019.c
index dd3ed2d6430b1e9fb2a1e4e1666deeb28b7578e1..d9a94df482d9f559481d671231d3ae04ee9f961e 100644 (file)
--- a/drivers/net/mdio/mdio-ipq4019.c
+++ b/drivers/net/mdio/mdio-ipq4019.c
@@ -352,8 +352,11 @@ static int ipq4019_mdio_probe(struct platform_device *pdev)
        /* The platform resource is provided on the chipset IPQ5018 */
        /* This resource is optional */
        res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-       if (res)
+       if (res) {
                priv->eth_ldo_rdy = devm_ioremap_resource(&pdev->dev, res);
+               if (IS_ERR(priv->eth_ldo_rdy))
+                       return PTR_ERR(priv->eth_ldo_rdy);
+       }
 
        bus->name = "ipq4019_mdio";
        bus->read = ipq4019_mdio_read_c22;