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authorVladimir Oltean <vladimir.oltean@nxp.com>2024-01-04 16:00:31 +0200
committerDavid S. Miller <davem@davemloft.net>2024-01-05 11:56:35 +0000
commit68e1010cda7967cfca9c8650ee1f4efcae54ab90 (patch)
treecedc1128591a758f1b13d0005ea63f5be85ab88d
parent7a898539391dccce00c3cb24d96a6ba80cef7f6d (diff)
net: dsa: qca8k: put MDIO bus OF node on qca8k_mdio_register() failure
of_get_child_by_name() gives us an OF node with an elevated refcount, which should be dropped when we're done with it. This is so that, if (of_node_check_flag(node, OF_DYNAMIC)) is true, the node's memory can eventually be freed. There are 2 distinct paths to be considered in qca8k_mdio_register(): - devm_of_mdiobus_register() succeeds: since commit 3b73a7b8ec38 ("net: mdio_bus: add refcounting for fwnodes to mdiobus"), the MDIO core treats this well. - devm_of_mdiobus_register() or anything up to that point fails: it is the duty of the qca8k driver to release the OF node. This change addresses the second case by making sure that the OF node reference is not leaked. The "mdio" node may be NULL, but of_node_put(NULL) is safe. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk> Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/dsa/qca/qca8k-8xxx.c21
1 files changed, 16 insertions, 5 deletions
diff --git a/drivers/net/dsa/qca/qca8k-8xxx.c b/drivers/net/dsa/qca/qca8k-8xxx.c
index ec57d9d52072..5f47a290bd6e 100644
--- a/drivers/net/dsa/qca/qca8k-8xxx.c
+++ b/drivers/net/dsa/qca/qca8k-8xxx.c
@@ -949,10 +949,15 @@ qca8k_mdio_register(struct qca8k_priv *priv)
struct dsa_switch *ds = priv->ds;
struct device_node *mdio;
struct mii_bus *bus;
+ int err;
+
+ mdio = of_get_child_by_name(priv->dev->of_node, "mdio");
bus = devm_mdiobus_alloc(ds->dev);
- if (!bus)
- return -ENOMEM;
+ if (!bus) {
+ err = -ENOMEM;
+ goto out_put_node;
+ }
bus->priv = (void *)priv;
snprintf(bus->id, MII_BUS_ID_SIZE, "qca8k-%d.%d",
@@ -962,12 +967,12 @@ qca8k_mdio_register(struct qca8k_priv *priv)
ds->user_mii_bus = bus;
/* Check if the devicetree declare the port:phy mapping */
- mdio = of_get_child_by_name(priv->dev->of_node, "mdio");
if (of_device_is_available(mdio)) {
bus->name = "qca8k user mii";
bus->read = qca8k_internal_mdio_read;
bus->write = qca8k_internal_mdio_write;
- return devm_of_mdiobus_register(priv->dev, bus, mdio);
+ err = devm_of_mdiobus_register(priv->dev, bus, mdio);
+ goto out_put_node;
}
/* If a mapping can't be found the legacy mapping is used,
@@ -976,7 +981,13 @@ qca8k_mdio_register(struct qca8k_priv *priv)
bus->name = "qca8k-legacy user mii";
bus->read = qca8k_legacy_mdio_read;
bus->write = qca8k_legacy_mdio_write;
- return devm_mdiobus_register(priv->dev, bus);
+
+ err = devm_mdiobus_register(priv->dev, bus);
+
+out_put_node:
+ of_node_put(mdio);
+
+ return err;
}
static int