netdev - Re: [PATCH net-next 7/9] net: phy: icplus: select page before writing control register

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Message-ID: <YCRBtK8Z+fAi2Sr9@lunn.ch>
Date:   Wed, 10 Feb 2021 21:27:32 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Michael Walle <michael@...le.cc>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next 7/9] net: phy: icplus: select page before
 writing control register

> I guess it boils down to: how hard should we try to get the driver
> behave correctly if the user is changing registers.

All bets are off if root starts messing with the PHY state from
userspace. Its a foot gun, don't be surprised with what happens when
you use it.

    Andrew