linux-kernel - Re: [PATCH net-next 2/2] net: phy: at803x: use proper locking in at803x_aneg

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Message-ID: <20210214022439.cyrfud4ahj4fzk7e@skbuf>
Date:   Sun, 14 Feb 2021 04:24:39 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Michael Walle <michael@...le.cc>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next 2/2] net: phy: at803x: use proper locking in
 at803x_aneg_done()

On Sun, Feb 14, 2021 at 03:18:49AM +0100, Michael Walle wrote:
> Am 14. Februar 2021 02:57:33 MEZ schrieb Vladimir Oltean <olteanv@...il.com>:
> >Hi Michael,
> >
> >On Sun, Feb 14, 2021 at 02:04:05AM +0100, Michael Walle wrote:
> >> at803x_aneg_done() checks if auto-negotiation is completed on the
> >SGMII
> >> side. This doesn't take the mdio bus lock and the page switching is
> >> open-coded. Now that we have proper page support, just use
> >> phy_read_paged(). Also use phydev->interface to check if we have an
> >> SGMII link instead of reading the mode register and be a bit more
> >> precise on the warning message.
> >>
> >> Signed-off-by: Michael Walle <michael@...le.cc>
> >> ---
> >
> >How did you test this patch?
>
> I'm afraid it's just compile time tested.

I'm asking because at803x_aneg_done has been dead code for more than 2
years now. Unreachable. And while it was reachable it was buggy and an
abuse of the phylib API. So you might want to just delete this function
instead. Context:
https://lkml.org/lkml/2020/5/30/375