linux-kernel - Re: [PATCH net] net: phy: mscc: fix deadlock in phy_ethtool_{get,set}

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Message-ID: <a9bfe427-4d76-44ea-9890-3b0c44ccb551@lunn.ch>
Date:   Tue, 14 Mar 2023 17:31:45 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: phy: mscc: fix deadlock in
 phy_ethtool_{get,set}_wol()

On Tue, Mar 14, 2023 at 05:30:25PM +0200, Vladimir Oltean wrote:
> Since the blamed commit, phy_ethtool_get_wol() and phy_ethtool_set_wol()
> acquire phydev->lock, but the mscc phy driver implementations,
> vsc85xx_wol_get() and vsc85xx_wol_set(), acquire the same lock as well,
> resulting in a deadlock.
> 
> Fixes: 2f987d486610 ("net: phy: Add locks to ethtool functions")
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Thanks Vladimir.

[Goes and checks to see if the same problem exists for other PHY drivers]

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

    Andrew