linux-kernel - Re: [PATCH] net: dsa: microchip: Use standard regmap locking

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Message-ID: <f0021a00-bc3b-4278-b4b7-29ead8e39f6a@sirena.org.uk>
Date: Wed, 28 Aug 2024 12:13:25 +0100
From: Mark Brown <broonie@...nel.org>
To: Paolo Abeni <pabeni@...hat.com>
Cc: Woojung Huh <woojung.huh@...rochip.com>, UNGLinuxDriver@...rochip.com,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: dsa: microchip: Use standard regmap locking

On Tue, Aug 27, 2024 at 02:54:52PM +0200, Paolo Abeni wrote:
> On 8/22/24 21:53, Mark Brown wrote:
> > For unclear reasons the ksz drivers use custom regmap locking which is
> > simply a wrapper around a standard mutex.
> 
> According to the commit introducing such lock,
> 013572a236ef53cbd1e315e0acf2ee632cc816d4
> the ksz driver family one regmap per register width (8/16/32), accessing the
> same set of registers.
> 
> The locking implemented with the code removed here allows serializing
> operations using different register widths.

This really could use a comment somewhere.

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