linux-kernel - Re: [PATCH 03/12] net: phy: add phy_device_set

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Date:   Wed, 5 Apr 2023 14:06:47 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Richard Cochran <richardcochran@...il.com>,
        Radu Pirea <radu-nicolae.pirea@....nxp.com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Iyappan Subramanian <iyappan@...amperecomputing.com>,
        Keyur Chudgar <keyur@...amperecomputing.com>,
        Quan Nguyen <quan@...amperecomputing.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        devicetree@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH 03/12] net: phy: add phy_device_set_miits helper

> +void phy_device_set_miits(struct phy_device *phydev,
> +			  struct mii_timestamper *mii_ts)
> +{
> +	if (!phydev)
> +		return;
> +
> +	if (phydev->mii_ts) {
> +		phydev_dbg(phydev,
> +			   "MII timestamper already set -> skip set\n");
> +		return;
> +	}
> +
> +	phydev->mii_ts = mii_ts;
> +}

We tend to be less paranoid. Few, if any, other functions test that
phydev is not NULL. And the current code allows overwriting of an
existing stamper. If you think overwriting should not be allowed
return -EINVAL, and change all the callers to test for it.

> +EXPORT_SYMBOL(phy_device_set_miits);

_GPL please. The code is a bit inconsistent, but new symbols should be
EXPORT_SYMBOL_GPL.

I do however like this patch, hiding away the internals of phydev.

  Andrew