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net: dsa: qca8k: put MDIO controller OF node if unavailable

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It was pointed out during the review [1] of commit e66bf63a7f ("net:
dsa: qca8k: skip MDIO bus creation if its OF node has status =
"disabled"") that we now leak a reference to the "mdio" OF node if it is
disabled.

This is only a concern when using dynamic OF as far as I can tell (like
probing on an overlay), since OF nodes are never freed in the regular
case. Additionally, I'm unaware of any actual device trees (in
production or elsewhere) which have status = "disabled" for the MDIO OF
node. So handling this as a simple enhancement.

[1] https://lore.kernel.org/netdev/CAJq09z4--Ug+3FAmp=EimQ8HTQYOWOuVon-PUMGB5a1N=RPv4g@mail.gmail.com/

Suggested-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2024-02-02 18:36:25 +02:00 committed by David S. Miller
parent 0cd216d769
commit 08932323cc
1 changed files with 1 additions and 2 deletions
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3
drivers/net/dsa/qca/qca8k-8xxx.c
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@ -954,7 +954,7 @@ qca8k_mdio_register(struct qca8k_priv *priv)
mdio = of_get_child_by_name(dev->of_node, "mdio");
if (mdio && !of_device_is_available(mdio))
goto out;
goto out_put_node;
bus = devm_mdiobus_alloc(dev);
if (!bus) {
@ -988,7 +988,6 @@ qca8k_mdio_register(struct qca8k_priv *priv)
out_put_node:
of_node_put(mdio);
out:
return err;
}