net: dsa: felix: check return code of mdio_alloc and mdio_register

These functions can return errors, it's best to catch them and trigger
the driver unwind code path.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>

diff --git a/drivers/net/mscc_eswitch/felix_switch.c b/drivers/net/mscc_eswitch/felix_switch.c
index 711dd44..551fc2c 100644 (file)
--- a/drivers/net/mscc_eswitch/felix_switch.c
+++ b/drivers/net/mscc_eswitch/felix_switch.c
@@ -275,6 +275,7 @@ static void felix_init(struct udevice *dev)
 static int felix_probe(struct udevice *dev)
 {
        struct felix_priv *priv = dev_get_priv(dev);
+       int err;
 
        if (ofnode_valid(dev_ofnode(dev)) &&
            !ofnode_is_available(dev_ofnode(dev))) {
@@ -299,11 +300,18 @@ static int felix_probe(struct udevice *dev)
                struct mii_dev *mii_bus;
 
                mii_bus = mdio_alloc();
+               if (!mii_bus)
+                       return -ENOMEM;
+
                mii_bus->read = felix_mdio_read;
                mii_bus->write = felix_mdio_write;
                mii_bus->priv = priv->imdio_base + FELIX_PM_IMDIO_BASE;
                strlcpy(mii_bus->name, dev->name, MDIO_NAME_LEN);
-               mdio_register(mii_bus);
+               err = mdio_register(mii_bus);
+               if (err) {
+                       mdio_free(mii_bus);
+                       return err;
+               }
        }
 
        dm_pci_clrset_config16(dev, PCI_COMMAND, 0, PCI_COMMAND_MEMORY);