linux-kernel - Re: [PATCH net-next v3 06/11] net: phy: add error checks in mmd_phy

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Message-ID: <9820dc4b-5fb2-4432-9156-a6ac7e52557a@lunn.ch>
Date:   Wed, 19 Jul 2023 01:34:51 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Michael Walle <mwalle@...nel.org>
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>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Marek Behún <kabel@...nel.org>,
        Xu Liang <lxu@...linear.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Simon Horman <simon.horman@...igine.com>
Subject: Re: [PATCH net-next v3 06/11] net: phy: add error checks in
 mmd_phy_indirect()

On Wed, Jul 12, 2023 at 05:07:06PM +0200, Michael Walle wrote:
> Add missing error checks in mmd_phy_indirect(). The error checks need to
> be disabled to retain the current behavior in phy_read_mmd() and
> phy_write_mmd(). Therefore, add a new parameter to enable the error
> checks.
> 
> This is a preparation patch to introduce a new C45-over-C22 access
> method which will make use of the new error checking.
> 
> Regarding the legacy handling, Russell states:
> 
> | The reason for that goes back to commit a59a4d192166 ("phy: add the
> | EEE support and the way to access to the MMD registers.")
> |
> | and to maintain compatibility with that; if we start checking for
> | errors now, we might trigger a kernel regression sadly.
> 
> Signed-off-by: Michael Walle <mwalle@...nel.org>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew