netdev - Re: [PATCH net-next v2 1/4] net: mdio: Introduce a regmap-based mdio driver

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Date: Thu, 25 May 2023 14:41:22 +0200
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Mark Brown <broonie@...nel.org>, 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>
Subject: Re: [PATCH net-next v2 1/4] net: mdio: Introduce a regmap-based
 mdio driver

Hello Russell,

On Thu, 25 May 2023 12:11:38 +0100
"Russell King (Oracle)" <linux@...linux.org.uk> wrote:

> On Thu, May 25, 2023 at 12:11:23PM +0200, Maxime Chevallier wrote:
> > +struct mii_bus *devm_mdio_regmap_register(struct device *dev,
> > +					  const struct
> > mdio_regmap_config *config) +{
> > +	struct mdio_regmap_config *mrc;
> > +	struct mii_bus *mii;
> > +	int rc;
> > +
> > +	if (!config->parent)
> > +		return ERR_PTR(-EINVAL);
> > +
> > +	mii = devm_mdiobus_alloc_size(config->parent,
> > sizeof(*mrc));
> > +	if (!mii)
> > +		return ERR_PTR(-ENOMEM);
> > +
> > +	mrc = mii->priv;
> > +	memcpy(mrc, config, sizeof(*mrc));
> > +
> > +	mrc->regmap = config->regmap;
> > +	mrc->valid_addr = config->valid_addr;  
> 
> You have just memcpy'd everything from config into mrc. Doesn't this
> already include "regmap" and "valid_addr" ?

Oh right... good catch, thanks !

> However, these are the only two things used, so does it really make
> sense to allocate the full mdio_regmap_config structure, or would a
> smaller data structure (of one pointer and one u8) be more
> appropriate?
> 

You are correct, other fields are unused so I'll use a new struct for
the mii->priv field.

Thank you for reviewing,

Best regards,

Maxime