[PATCH net-next v5 08/11] net: dsa: realtek: clean user_mii_bus setup

Luiz Angelo Daros de Luca
2024-01-30T23:14:33Z

Remove the line assigning dev.of_node in mdio_bus as subsequent
of_mdiobus_register will always overwrite it.

As discussed in [1], allow the DSA core to be simplified, by not
assigning ds->user_mii_bus when the MDIO bus is described in OF, as it
is unnecessary.

Since commit 3b73a7b8ec38 ("net: mdio_bus: add refcounting for fwnodes
to mdiobus"), we can put the "mdio" node just after the MDIO bus
registration.

[1] https://lkml.kernel.org/netdev/20231213120656.x46fyad6ls7sqyzv@skbuf/T/#u

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
---
drivers/net/dsa/realtek/realtek-smi.c | 13 +++----------
1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/net/dsa/realtek/realtek-smi.c b/drivers/net/dsa/realtek/realtek-smi.c
index ad47dcbbd2b2..b84df4564c15 100644
--- a/drivers/net/dsa/realtek/realtek-smi.c
+++ b/drivers/net/dsa/realtek/realtek-smi.c
@@ -331,7 +331,7 @@ static int realtek_smi_setup_mdio(struct dsa_switch *ds)
{
struct realtek_priv *priv = ds->priv;
struct device_node *mdio_np;
- int ret;
+ int ret = 0;

mdio_np = of_get_child_by_name(priv->dev->of_node, "mdio");
if (!mdio_np) {
@@ -344,15 +344,14 @@ static int realtek_smi_setup_mdio(struct dsa_switch *ds)
ret = -ENOMEM;
goto err_put_node;
}
+
priv->user_mii_bus->priv = priv;
priv->user_mii_bus->name = "SMI user MII";
priv->user_mii_bus->read = realtek_smi_mdio_read;
priv->user_mii_bus->write = realtek_smi_mdio_write;
snprintf(priv->user_mii_bus->id, MII_BUS_ID_SIZE, "SMI-%d",
ds->index);
- priv->user_mii_bus->dev.of_node = mdio_np;
priv->user_mii_bus->parent = priv->dev;
- ds->user_mii_bus = priv->user_mii_bus;

ret = devm_of_mdiobus_register(priv->dev, priv->user_mii_bus, mdio_np);
if (ret) {
@@ -361,8 +360,6 @@ static int realtek_smi_setup_mdio(struct dsa_switch *ds)
goto err_put_node;
}

- return 0;
-
err_put_node:
of_node_put(mdio_np);

@@ -422,8 +419,7 @@ EXPORT_SYMBOL_NS_GPL(realtek_smi_probe, REALTEK_DSA);
* @pdev: platform_device to be removed.
*
* This function should be used as the .remove_new in a platform_driver. First
- * it unregisters the DSA switch and cleans internal data. Finally, it calls
- * the common remove function.
+ * it unregisters the DSA switch and then it calls the common remove function.
*
* Context: Can sleep.
* Return: Nothing.
@@ -437,9 +433,6 @@ void realtek_smi_remove(struct platform_device *pdev)

rtl83xx_unregister_switch(priv);

- if (priv->user_mii_bus)
- of_node_put(priv->user_mii_bus->dev.of_node);
-
rtl83xx_remove(priv);
}
EXPORT_SYMBOL_NS_GPL(realtek_smi_remove, REALTEK_DSA);

--
2.43.0