netdev - Re: [PATCH net 1/2] net: dsa: don't allocate the slave_mii

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Message-ID: <YUnI5JnKHLW05/Ux@lunn.ch>
Date:   Tue, 21 Sep 2021 13:58:28 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, Linus Walleij <linus.walleij@...aro.org>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Wolfram Sang <wsa@...nel.org>, linux-i2c@...r.kernel.org,
        Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Lino Sanfilippo <LinoSanfilippo@....de>
Subject: Re: [PATCH net 1/2] net: dsa: don't allocate the slave_mii_bus using
 devres

> I _could_ imagine using devres because the condition used on remove is
> different than the condition used on probe. So strictly speaking, DSA
> cannot determine whether the ds->slave_mii_bus it sees on remove is the
> ds->slave_mii_bus that _it_ has allocated on probe. Using devres would
> have solved that problem. But nonetheless, the existing code already
> proceeds to unregister the MDIO bus, even though it might be
> unregistering an MDIO bus it has never registered. So I can only guess
> that no driver that implements ds->ops->phy_read also allocates and
> registers ds->slave_mii_bus itself.

That should not happen. It should be either/or.

But there is no enforcement of that.

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

    Andrew