linux-kernel - Re: [PATCH net-next v5 09/23] net: phy: start using genphy_c45_ethtool_get/set

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Message-ID: <Y+Gj6PObDZ+zJSSG@lunn.ch>
Date:   Tue, 7 Feb 2023 02:05:44 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Wei Fang <wei.fang@....com>,
        Heiner Kallweit <hkallweit1@...il.com>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Arun.Ramadoss@...rochip.com, intel-wired-lan@...ts.osuosl.org
Subject: Re: [PATCH net-next v5 09/23] net: phy: start using
 genphy_c45_ethtool_get/set_eee()

On Mon, Feb 06, 2023 at 02:50:36PM +0100, Oleksij Rempel wrote:
> All preparations are done. Now we can start using new functions and remove
> the old code.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>

This change looks correct, in that it just replaces code with other
equivalent code.

But looking at it, i started to wonder about locking. I don't see
phydev->lock held anywhere. But it does access members of phydev, in
particular speed and duplex. If the PHY state machine is running at
the same time, and phy_read_status() is called, those members can
contain invalid information.

So i think another patch is needed to add locking to these two
functions.

Otherwise:

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew