linux-kernel - Re: [PATCH net-next v7 4/7] net: mdiobus: search for PSE nodes by parsing PHY nodes.

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Message-ID: <20220927175548.331d9bae@kernel.org>
Date:   Tue, 27 Sep 2022 17:55:48 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
        David Jander <david@...tonic.nl>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Robert Marko <robert.marko@...tura.hr>
Subject: Re: [PATCH net-next v7 4/7] net: mdiobus: search for PSE nodes by
 parsing PHY nodes.

On Mon, 26 Sep 2022 13:24:57 +0200 Oleksij Rempel wrote:
> +static struct pse_control *
> +fwnode_find_pse_control(struct fwnode_handle *fwnode)
> +{
> +	struct pse_control *psec;
> +	struct device_node *np;
> +
> +	np = to_of_node(fwnode);
> +	if (!np)
> +		return NULL;
> +
> +	psec = of_pse_control_get(np);

This will fail with ENOTSUPP if PSE is not built. Won't that make all
fwnode_mdiobus_register_phy() calls fail?

static inline struct pse_control *of_pse_control_get(struct device_node *node)
{
	return ERR_PTR(-ENOTSUPP);
}

Actually let me take a closer look at patch 2 :S

> +	if (PTR_ERR(psec) == -ENOENT)
> +		return NULL;
> +
> +	return psec;
> +}