linux-kernel - [PATCH net-next v5 08/11] net: dsa: realtek: clean user_mii

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Message-Id: <20240130-realtek_reverse-v5-8-ecafd9283a07@gmail.com>
Date: Tue, 30 Jan 2024 20:13:27 -0300
From: Luiz Angelo Daros de Luca <luizluca@...il.com>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Alvin Šipraga <alsi@...g-olufsen.dk>, 
 Andrew Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>, 
 Vladimir Oltean <olteanv@...il.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Russell King <linux@...linux.org.uk>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Luiz Angelo Daros de Luca <luizluca@...il.com>
Subject: [PATCH net-next v5 08/11] net: dsa: realtek: clean user_mii_bus
 setup

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@...il.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