linux-kernel - Re: [PATCH net-next 10/16] net: pcs: xpcs: Add generic DW XPCS MDIO-device support

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Message-ID: <wz7h5lvxnhw2rav6s54dhv2xbxsks6tlpx3hvywjn3afmkf2av@tbiigyupuga7>
Date:   Thu, 14 Dec 2023 15:28:57 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Tomer Maimon <tmaimon77@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, openbmc@...ts.ozlabs.org,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 10/16] net: pcs: xpcs: Add generic DW XPCS
 MDIO-device support

On Thu, Dec 14, 2023 at 02:00:16PM +0200, Vladimir Oltean wrote:
> On Thu, Dec 14, 2023 at 02:54:00PM +0300, Serge Semin wrote:
> > > > > The pcs-rzn1-miic.c driver puts a device_link to the MAC to at least
> > > > > tear down the whole thing when the PCS is unbound, which is saner than
> > > > > crashing the kernel. I don't see the equivalent protection mechanism here?
> > > > 
> > > > You are right. I don't have any equivalent protection here. Thanks for
> > > > suggesting a solution.
> > > 
> > > I think that a device link between the "ethernet" device and the "mdio"
> > > device (controller, parent of the PHY or PCS), if the Ethernet is not a
> > > parent of the MDIO controller, could also solve that. But it would also
> > > require ACK from PHY maintainers, who may have grander plans to address
> > > this snag.
> > 
> > Ok. I'll add it in v2. Let's see what the maintainers think about
> > that.
> 
> Are you not following the parallel discussion on the topic of PCS
> devices having bound drivers?
> https://lore.kernel.org/netdev/ZXnV%2FPk1PYxAm%2FjS@shell.armlinux.org.uk/
> 
> Sadly I don't have much spare time to join that discussion, but it looks
> like you could.

Ok. Thanks for sharing the link. At least I'll follow up the
discussion in order to pick up/wait for a solution they'll come up
with.

-Serge(y)