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Message-ID: <7e89034c-afbd-4180-98e5-50d8cd07f924@arinc9.com>
Date: Mon, 8 Jan 2024 15:14:45 +0300
From: Arınç ÜNAL <arinc.unal@...nc9.com>
To: Vladimir Oltean <olteanv@...il.com>
Cc: Simon Horman <horms@...nel.org>, Daniel Golle <daniel@...rotopia.org>,
Landen Chao <Landen.Chao@...iatek.com>, DENG Qingfang <dqfext@...il.com>,
Sean Wang <sean.wang@...iatek.com>, Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
David Bauer <mail@...id-bauer.net>, mithat.guner@...ont.com,
erkin.bozoglu@...ont.com, Luiz Angelo Daros de Luca <luizluca@...il.com>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next] net: dsa: mt7530: support OF-based registration
of switch MDIO bus
On 8.01.2024 14:00, Vladimir Oltean wrote:
> On Mon, Jan 08, 2024 at 01:22:18PM +0300, Arınç ÜNAL wrote:
>>>> diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
>>>> index 391c4dbdff42..39d7e7ad7154 100644
>>>> --- a/drivers/net/dsa/mt7530.c
>>>> +++ b/drivers/net/dsa/mt7530.c
>>>> @@ -2153,17 +2153,25 @@ mt7530_free_irq(struct mt7530_priv *priv)
>>>> static int
>>>> mt7530_setup_mdio(struct mt7530_priv *priv)
>>>> {
>>>> + struct device_node *mnp, *np = priv->dev->of_node;
>>>> struct dsa_switch *ds = priv->ds;
>>>> struct device *dev = priv->dev;
>>>> struct mii_bus *bus;
>>>> static int idx;
>>>> - int ret;
>>>> + int ret = 0;
>>>> +
>>>> + mnp = of_get_child_by_name(np, "mdio");
>>>> +
>>>> + if (mnp && !of_device_is_available(mnp))
>>>> + goto out;
>>>
>>> nit: I think it would easier on the eyes to simply
>>>
>>> return 0;
>
> Actually "return 0" leaks "mnp". An of_node_put() is needed.
I realised that I also miss these:
- run of_node_put(mnp) if bus = devm_mdiobus_alloc(dev) fails
- don't run mt7530_free_mdio_irq if MDIO bus is described on OF
Please let me know if this addresses everything:
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 391c4dbdff42..cf2ff7680c15 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2146,24 +2146,40 @@ mt7530_free_irq_common(struct mt7530_priv *priv)
static void
mt7530_free_irq(struct mt7530_priv *priv)
{
- mt7530_free_mdio_irq(priv);
+ struct device_node *mnp, *np = priv->dev->of_node;
+
+ mnp = of_get_child_by_name(np, "mdio");
+ if (!mnp)
+ mt7530_free_mdio_irq(priv);
+ of_node_put(mnp);
+
mt7530_free_irq_common(priv);
}
static int
mt7530_setup_mdio(struct mt7530_priv *priv)
{
+ struct device_node *mnp, *np = priv->dev->of_node;
struct dsa_switch *ds = priv->ds;
struct device *dev = priv->dev;
struct mii_bus *bus;
static int idx;
- int ret;
+ int ret = 0;
+
+ mnp = of_get_child_by_name(np, "mdio");
+
+ if (mnp && !of_device_is_available(mnp))
+ goto out;
bus = devm_mdiobus_alloc(dev);
- if (!bus)
- return -ENOMEM;
+ if (!bus) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ if (!mnp)
+ ds->user_mii_bus = bus;
- ds->user_mii_bus = bus;
bus->priv = priv;
bus->name = KBUILD_MODNAME "-mii";
snprintf(bus->id, MII_BUS_ID_SIZE, KBUILD_MODNAME "-%d", idx++);
@@ -2174,16 +2190,18 @@ mt7530_setup_mdio(struct mt7530_priv *priv)
bus->parent = dev;
bus->phy_mask = ~ds->phys_mii_mask;
- if (priv->irq)
+ if (priv->irq && !mnp)
mt7530_setup_mdio_irq(priv);
- ret = devm_mdiobus_register(dev, bus);
+ ret = devm_of_mdiobus_register(dev, bus, mnp);
if (ret) {
dev_err(dev, "failed to register MDIO bus: %d\n", ret);
- if (priv->irq)
+ if (priv->irq && !mnp)
mt7530_free_mdio_irq(priv);
}
+out:
+ of_node_put(mnp);
return ret;
}
Arınç
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