linux-kernel - Re: [PATCH net-next v4 4/5] net: altera_tse: explicitly disable autoscan on the regmap-mdio bus

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Message-ID: <20230607165324.37f981f5@pc-7.home>
Date:   Wed, 7 Jun 2023 16:53:24 +0200
From:   Maxime Chevallier <maxime.chevallier@...tlin.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, alexis.lothore@...tlin.com,
        thomas.petazzoni@...tlin.com, Andrew Lunn <andrew@...n.ch>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Simon Horman <simon.horman@...igine.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Feiyang Chen <chenfeiyang@...ngson.cn>
Subject: Re: [PATCH net-next v4 4/5] net: altera_tse: explicitly disable
 autoscan on the regmap-mdio bus

Hello Russell,

On Wed, 7 Jun 2023 13:26:41 +0100
"Russell King (Oracle)" <linux@...linux.org.uk> wrote:

> On Wed, Jun 07, 2023 at 03:59:40PM +0200, Maxime Chevallier wrote:
> > Set the .autoscan flag to false on the regmap-mdio bus, to avoid using a
> > random uninitialized value. We don't want autoscan in this case as the
> > mdio device is a PCS and not a PHY.  
> 
> Isn't this now covered by patch 1's memset of mrc?
> 

Yes it is, however I thought it could be fine keeping it set explicitely
anyway, as we do have a PCS on that bus and we don't want any autoscan
happening. Since these two drivers are the first users of mdio_regmap,
my hope is that we could get these reference usages covering all fields.

Should I drop this ?

Maxime