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

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Date:   Tue, 14 Mar 2023 18:45:47 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Andrew Lunn <andrew@...n.ch>
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 05:31:45PM +0100, Andrew Lunn wrote:
> [Goes and checks to see if the same problem exists for other PHY drivers]

Here's a call path I am not sure how to interpret (but doesn't look like
there's anything preventing it).

linkstate_get_sqi()
-> mutex_lock(&phydev->lock)
   -> phydev->drv->get_sqi(phydev);
      -> lan87xx_get_sqi()
         -> access_ereg()
            -> lan937x_dsp_workaround()
               -> mutex_lock(&phydev->lock);
               -> mutex_unlock(&phydev->lock);
-> mutex_unlock(&phydev->lock)