linux-kernel - Re: [PATCH] net: ethernet: et131x: Remove redundant register read

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Message-ID: <20200717134008.GB1336433@lunn.ch>
Date:   Fri, 17 Jul 2020 15:40:08 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Mark Einon <mark.einon@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ethernet: et131x: Remove redundant register read

On Fri, Jul 17, 2020 at 02:21:35PM +0100, Mark Einon wrote:
> Following the removal of an unused variable assignment (remove
> unused variable 'pm_csr') the associated register read can also go,
> as the read also occurs in the subsequent et1310_in_phy_coma()
> call.

Hi Mark

Do you have any hardware documentation which indicates these read are
not required? Have you looked back through the git history to see if
there are any comments about these read?

Hardware reads which appear pointless are sometimes very important to
actually make the hardware work.

	 Andrew