Use the new of_get_compatible_child() helper to look up child nodes to avoid ever matching non-child nodes elsewhere in the tree.

Also fix up the related struct device_node leaks.

Fixes: 14fceff4771e ("net: dsa: Add Lantiq / Intel DSA driver for vrx200") Cc: stable stable@vger.kernel.org # 4.20 Cc: Hauke Mehrtens hauke@hauke-m.de Signed-off-by: Johan Hovold johan@kernel.org --- drivers/net/dsa/lantiq_gswip.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c index b06c41c98de9..5792674dd4e4 100644 --- a/drivers/net/dsa/lantiq_gswip.c +++ b/drivers/net/dsa/lantiq_gswip.c @@ -1069,10 +1069,10 @@ static int gswip_probe(struct platform_device *pdev) version = gswip_switch_r(priv, GSWIP_VERSION);

/* bring up the mdio bus */ - gphy_fw_np = of_find_compatible_node(pdev->dev.of_node, NULL, - "lantiq,gphy-fw"); + gphy_fw_np = of_get_compatible_child(dev->of_node, "lantiq,gphy-fw"); if (gphy_fw_np) { err = gswip_gphy_fw_list(priv, gphy_fw_np, version); + of_node_put(gphy_fw_np); if (err) { dev_err(dev, "gphy fw probe failed\n"); return err; @@ -1080,13 +1080,12 @@ static int gswip_probe(struct platform_device *pdev) }

/* bring up the mdio bus */ - mdio_np = of_find_compatible_node(pdev->dev.of_node, NULL, - "lantiq,xrx200-mdio"); + mdio_np = of_get_compatible_child(dev->of_node, "lantiq,xrx200-mdio"); if (mdio_np) { err = gswip_mdio(priv, mdio_np); if (err) { dev_err(dev, "mdio probe failed\n"); - goto gphy_fw; + goto put_mdio_node; } }

@@ -1115,7 +1114,8 @@ static int gswip_probe(struct platform_device *pdev) mdio_bus: if (mdio_np) mdiobus_unregister(priv->ds->slave_mii_bus); -gphy_fw: +put_mdio_node: + of_node_put(mdio_np); for (i = 0; i < priv->num_gphy_fw; i++) gswip_gphy_fw_remove(priv, &priv->gphy_fw[i]); return err; @@ -1134,8 +1134,10 @@ static int gswip_remove(struct platform_device *pdev)

dsa_unregister_switch(priv->ds);

- if (priv->ds->slave_mii_bus) + if (priv->ds->slave_mii_bus) { mdiobus_unregister(priv->ds->slave_mii_bus); + of_node_put(priv->ds->slave_mii_bus->dev.of_node); + }

for (i = 0; i < priv->num_gphy_fw; i++) gswip_gphy_fw_remove(priv, &priv->gphy_fw[i]);