[PATCHv2 net] net: mdio-ipq4019: add missing error check

[Rosen Penev]

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@xxxxxxxxx>
---
 v2: reword and return on error instead.
 drivers/net/mdio/mdio-ipq4019.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mdio/mdio-ipq4019.c b/drivers/net/mdio/mdio-ipq4019.c
index dd3ed2d6430b..d9a94df482d9 100644
--- 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;
-- 
2.47.0