netdev - Re: [PATCH v2 1/3] net: sfp: add workaround for Realtek RTL8672 and RTL9601C chips

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Message-ID: <X/ZrvOwsyrfmh3B2@lunn.ch>
Date:   Thu, 7 Jan 2021 03:02:36 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Pali Rohár <pali@...nel.org>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Thomas Schreiber <tschreibe@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Marek Behún <kabel@...nel.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] net: sfp: add workaround for Realtek RTL8672 and
 RTL9601C chips

> +	/* hwmon interface needs to access 16bit registers in atomic way to
> +	 * guarantee coherency of the diagnostic monitoring data. If it is not
> +	 * possible to guarantee coherency because EEPROM is broken in such way
> +	 * that does not support atomic 16bit read operation then we have to
> +	 * skip registration of hwmon device.
> +	 */
> +	if (sfp->i2c_block_size < 2) {
> +		dev_info(sfp->dev, "skipping hwmon device registration "
> +				   "due to broken EEPROM\n");
> +		dev_info(sfp->dev, "diagnostic EEPROM area cannot be read "
> +				   "atomically to guarantee data coherency\n");
> +		return;
> +	}

This solves hwmon. But we still return the broken data to ethtool -m.
I wonder if we should prevent that?

  Andrew