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

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Message-ID: <817f9c27-70d6-55bd-a201-e54f3f08bbec@omp.ru>
Date:   Mon, 19 Sep 2022 21:43:31 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        "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>
CC:     <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: sh_eth: Fix PHY state warning splat during system
 resume

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: 626 at drivers/net/phy/phy_device.c:323 mdio_bus_phy_resume+0xbc/0xe4
> 
> As the Renesas SuperH Ethernet 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>

[...]

> diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
> index 67ade78fb7671c4a..7fd8828d3a846169 100644
> --- a/drivers/net/ethernet/renesas/sh_eth.c
> +++ b/drivers/net/ethernet/renesas/sh_eth.c
> @@ -2029,6 +2029,8 @@ static int sh_eth_phy_init(struct net_device *ndev)
>  	if (mdp->cd->register_type != SH_ETH_REG_GIGABIT)
>  		phy_set_max_speed(phydev, SPEED_100);
>  
> +	/* Indicate that the MAC is responsible for managing PHY PM */
> +	phydev->mac_managed_pm = true;

   Again, this field is declared as *unsigned*...

>  	phy_attached_info(phydev);
[...]

MBR, Sergey