netdev - Re: [PATCH net-next v3 05/11] net: phy: Create SFP phy

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Message-ID: <aYI1zd6Iddcdt6xc@horms.kernel.org>
Date: Tue, 3 Feb 2026 17:52:13 +0000
From: Simon Horman <horms@...nel.org>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: davem@...emloft.net, Andrew Lunn <andrew@...n.ch>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Russell King <linux@...linux.org.uk>,
	Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Herve Codina <herve.codina@...tlin.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Köry Maincent <kory.maincent@...tlin.com>,
	Marek Behún <kabel@...nel.org>,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	Nicolò Veronese <nicveronese@...il.com>,
	mwojtas@...omium.org, Romain Gantois <romain.gantois@...tlin.com>,
	Daniel Golle <daniel@...rotopia.org>,
	Dimitri Fedrau <dimitri.fedrau@...bherr.com>
Subject: Re: [PATCH net-next v3 05/11] net: phy: Create SFP phy_port before
 registering usptream

On Sun, Feb 01, 2026 at 04:12:42PM +0100, Maxime Chevallier wrote:
> When dealing with PHY-driven SFP, we create a phy_port representing the
> SFP bus when we know we have such a bus.
> 
> We can move the port creation before registering the sfp upstream ops,
> as long as we know the SFP bus is there. This will allow passing the
> phy_port along with the upstream information to the SFP bus.
> 
> Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>

...

> @@ -1698,22 +1700,34 @@ static int phy_setup_sfp_port(struct phy_device *phydev)
>   */
>  static int phy_sfp_probe(struct phy_device *phydev)
>  {
> +	struct phy_port *port;
>  	struct sfp_bus *bus;
> -	int ret = 0;
> +	int ret;
>  
> -	if (phydev->mdio.dev.fwnode) {
> -		bus = sfp_bus_find_fwnode(phydev->mdio.dev.fwnode);
> -		if (IS_ERR(bus))
> -			return PTR_ERR(bus);
> +	if (!phydev->mdio.dev.fwnode)
> +		return 0;
> +
> +	bus = sfp_bus_find_fwnode(phydev->mdio.dev.fwnode);
> +	if (IS_ERR(bus))
> +		return PTR_ERR(bus);
>  
> -		phydev->sfp_bus = bus;
> +	phydev->sfp_bus = bus;
>  
> -		ret = sfp_bus_add_upstream(bus, phydev, &sfp_phydev_ops);
> -		sfp_bus_put(bus);
> +	if (bus) {
> +		port = phy_setup_sfp_port(phydev);
> +		if (IS_ERR(port)) {
> +			sfp_bus_put(bus);
> +			return PTR_ERR(port);
> +		}
>  	}
>  
> -	if (!ret && phydev->sfp_bus)
> -		ret = phy_setup_sfp_port(phydev);
> +	ret = sfp_bus_add_upstream(bus, phydev, &sfp_phydev_ops);
> +	sfp_bus_put(bus);
> +
> +	if (ret && port) {

Hi Maxime,

If bus is NULL then port will not be set here.

Flagged by Smatch.

> +		phy_del_port(phydev, port);
> +		phy_port_destroy(port);
> +	}
>  
>  	return ret;
>  }
> -- 
> 2.49.0
>