linux-kernel - Re: [PATCH] net: ravb: Fix PHY state warning splat during system resume

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Date:   Tue, 20 Sep 2022 09:07:19 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Sergey Shtylyov <s.shtylyov@....ru>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ravb: Fix PHY state warning splat during system resume

Hi Sergey,

On Mon, Sep 19, 2022 at 8:40 PM Sergey Shtylyov <s.shtylyov@....ru> wrote:
> On 9/19/22 5:48 PM, Geert Uytterhoeven wrote:
> > Since commit 744d23c71af39c7d ("net: phy: Warn about incorrect
> > mdio_bus_phy_resume() state"), a warning splat is printed during system
> > resume with Wake-on-LAN disabled:
> >
> >         WARNING: CPU: 0 PID: 1197 at drivers/net/phy/phy_device.c:323 mdio_bus_phy_resume+0xbc/0xc8
> >
> > As the Renesas Ethernet AVB driver already calls phy_{stop,start}() in
> > its suspend/resume callbacks, it is sufficient to just mark the MAC
> > responsible for managing the power state of the PHY.
> >
> > Fixes: fba863b816049b03 ("net: phy: make PHY PM ops a no-op if MAC driver manages PHY PM")
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
>
> Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>

Thanks for your review!

> > --- a/drivers/net/ethernet/renesas/ravb_main.c
> > +++ b/drivers/net/ethernet/renesas/ravb_main.c
> > @@ -1449,6 +1449,8 @@ static int ravb_phy_init(struct net_device *ndev)
> >               phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_100baseT_Half_BIT);
> >       }
> >
> > +     /* Indicate that the MAC is responsible for managing PHY PM */
> > +     phydev->mac_managed_pm = true;
>
>    Hm, this field is declared as *unsigned*...

True, I copied this from drivers/net/ethernet/broadcom/genet/bcmmii.c.
But true/false are fully compatible with single-bit values.

The linuxdoc suggests to use true, like for all other single-bit fields used
as booleans:

include/linux/phy.h: * @mac_managed_pm: Set true if MAC driver takes
of suspending/resuming PHY

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds