linux-kernel - Re: [PATCH net-next v5 05/13] net: pcs: add Renesas MII converter driver

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Message-ID: <20220520084914.5x6bfu4qaza4tqcz@skbuf>
Date:   Fri, 20 May 2022 11:49:14 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Clément Léger <clement.leger@...tlin.com>
Cc:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Herve Codina <herve.codina@...tlin.com>,
        Miquèl Raynal <miquel.raynal@...tlin.com>,
        Milan Stevanovic <milan.stevanovic@...com>,
        Jimmy Lalande <jimmy.lalande@...com>,
        Pascal Eberhard <pascal.eberhard@...com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v5 05/13] net: pcs: add Renesas MII converter
 driver

On Fri, May 20, 2022 at 09:52:41AM +0200, Clément Léger wrote:
> > Also, as a request to unbind this driver would be disasterous to users,
> > I think you should set ".suppress_bind_attrs = true" to prevent the
> > sysfs bind/unbind facility being available. This doesn't completely
> > solve the problem.
> 
> Acked. What should I do to make it more robust ? Should I use a
> refcount per pdev and check that in the remove() callback to avoid
> removing the pdev if used ?

I wonder, if you call device_link_add(ds->dev, miic->dev, DL_FLAG_AUTOREMOVE_CONSUMER),
wouldn't that be enough to auto-unbind the DSA driver when the MII
converter driver unbinds?