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

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Message-ID: <ZG9CajddFYKAFlO/@shell.armlinux.org.uk>
Date:   Thu, 25 May 2023 12:11:38 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Maxime Chevallier <maxime.chevallier@...tlin.com>
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

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" ?

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?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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