linux-kernel - Re: [PATCH net-next] net: phy: swphy: Only warn once for unknown speed

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Message-ID: <Y4kTFRBvsN/JCeNd@lunn.ch>
Date:   Thu, 1 Dec 2022 21:48:21 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Sean Anderson <sean.anderson@...o.com>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        linux-kernel@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next] net: phy: swphy: Only warn once for unknown
 speed

On Thu, Dec 01, 2022 at 03:22:53PM -0500, Sean Anderson wrote:
> swphy_read_reg is called quite frequently during normal operation. If an
> invalid speed is used for state, then it can turn dmesg into a firehose.
> Although the first warn will likely contain a backtrace for the
> offending driver, later warnings will usually just contain a backtrace
> from the phy state machine. Just warn once.

Hi Sean

How did you trigger this? I have a patch in this area as well, which i
want Russells opinion on. I'm wondering if we are hitting the same
problem.

	Andrew