Re: [PATCH net v2 3/3] net: phy: don't try to setup PHY-driven SFP cages when using genphy

[Jakub Kicinski <kuba@kernel.org>]

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---
net: phy: don't try to setup PHY-driven SFP cages when using genphy

This change skips phy_sfp_probe() when the genphy driver is bound,
avoiding an RTNL deadlock in sfp_bus_add_upstream() since genphy
binding runs under RTNL while non-genphy driver binding does not.

> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index a171cbe2a74a..8eace58e9f12 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -3512,9 +3512,14 @@ static int phy_setup_ports(struct phy_device *phydev)
>  	if (ret)
>  		return ret;
>  
> -	ret = phy_sfp_probe(phydev);
> -	if (ret)
> -		goto out;
> +	/* We don't support SFP with genphy drivers. Also, genphy driver binding
> +	 * occurs with RTNL help, wich will deadlock the sfp_bus_add_upstream().
                          ^^^^

[Low]
There is a typo in the new comment, "wich" should be "which".

> +	 */
> +	if (!phydev->is_genphy_driven) {
> +		ret = phy_sfp_probe(phydev);
> +		if (ret)
> +			goto out;
> +	}
>  
>  	if (phydev->n_ports < phydev->max_n_ports) {
>  		ret = phy_default_setup_single_port(phydev);