linux-kernel - Re: [PATCH net 2/2] net: phy: Use C45 Helpers in PHY

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Message-ID: <20190301135302.GB19813@lunn.ch>
Date:   Fri, 1 Mar 2019 14:53:02 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Jose Abreu <jose.abreu@...opsys.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Joao Pinto <joao.pinto@...opsys.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH net 2/2] net: phy: Use C45 Helpers in PHY_FORCING state

On Fri, Mar 01, 2019 at 11:54:24AM +0100, Jose Abreu wrote:
> +static inline int phy_update_link(struct phy_device *phydev)
> +{
> +	if (!phydev->drv)
> +		return -EIO;
> +
> +	if (phydev->drv->read_status)
> +		return phydev->drv->read_status(phydev);
> +	else if (phydev->is_c45)
> +		return gen10g_read_status(phydev);
> +	else
> +		return genphy_update_link(phydev);
> +}

Hi Jose

The asymmetry here could be an issue.  We might fall into the trap
that a c45 PHY has the full state in phydev updated, were as a c22
only has the link updated. Somebody testing on C45 might miss a bug
for a C22 device.

Maybe this should be called phy_read_state(), and calls
genphy_read_status() not genphy_update_link().

     Andrew