netdev - Re: [PATCH net 1/7] net: dsa: mv88e6xxx: don't use devres for mdiobus

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Message-ID: <YgHKgEAoPOKH7wE6@lunn.ch>
Date:   Tue, 8 Feb 2022 02:42:24 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com,
        Oleksij Rempel <linux@...pel-privat.de>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Rafael Richter <rafael.richter@....de>,
        Daniel Klauer <daniel.klauer@....de>
Subject: Re: [PATCH net 1/7] net: dsa: mv88e6xxx: don't use devres for mdiobus

On Mon, Feb 07, 2022 at 06:15:47PM +0200, Vladimir Oltean wrote:
> As explained in commits:
> 74b6d7d13307 ("net: dsa: realtek: register the MDIO bus under devres")
> 5135e96a3dd2 ("net: dsa: don't allocate the slave_mii_bus using devres")
> 
> mdiobus_free() will panic when called from devm_mdiobus_free() <-
> devres_release_all() <- __device_release_driver(), and that mdiobus was
> not previously unregistered.

...
 
> Fixes: ac3a68d56651 ("net: phy: don't abuse devres in devm_mdiobus_register()")
> Reported-by: Rafael Richter <Rafael.Richter@....de>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

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

    Andrew