linux-kernel - Re: [PATCH v2 1/2 net-next] net: phy: mscc: add support for CLKOUT ctrl reg for VSC8531 and similar

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Message-ID: <CAH3L5QrtFwTqqFKjPrMFCz4JgUWOFWFUJXpN71Gyprcd33A7hg@mail.gmail.com>
Date:   Fri, 14 Jul 2023 09:09:14 +0300
From:   Alexandru Ardelean <alex@...uggie.ro>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, hkallweit1@...il.com, linux@...linux.org.uk,
        olteanv@...il.com, marius.muresan@....ro
Subject: Re: [PATCH v2 1/2 net-next] net: phy: mscc: add support for CLKOUT
 ctrl reg for VSC8531 and similar

On Thu, Jul 13, 2023 at 11:35 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> > +set_reg:
> > +     mutex_lock(&phydev->lock);
> > +     rc = phy_modify_paged(phydev, MSCC_PHY_PAGE_EXTENDED_GPIO,
> > +                           VSC8531_CLKOUT_CNTL, mask, set);
> > +     mutex_unlock(&phydev->lock);
>
> What is this mutex protecting?

This was inspired by vsc85xx_edge_rate_cntl_set().
Which has the same format.

I'll re-test with this lock removed.
I may be misremembering (or maybe I did something silly at some
point), but there was a weird stack-trace warning before adding this
lock there.
This was with a 5.10.116 kernel version.

>
>      Andrew