linux-kernel - Re: [PATCH net] net: ethernet: ave: Remove duplicate suspend/resume calls for phy

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Date:   Fri, 21 Oct 2022 22:55:01 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Andrew Lunn <andrew@...n.ch>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: ethernet: ave: Remove duplicate suspend/resume
 calls for phy

On 21.10.2022 19:45, Kunihiko Hayashi wrote:
> Since AVE has its own suspend/resume functions, there is no need to call
> mdio_bus suspend/resume functions. Set phydev->mac_managed_pm to true
> to avoid the calls.
> 
The commit description doesn't make clear (any longer) what the issue
is that you're fixing. You should mention the WARN_ON() dump here
like in your first attempt.

> In addition, ave_open() executes __phy_resume() via phy_start() in
> ave_resume(), so no need to call phy_resume() explicitly. Remove it.
> 
This sounds like an improvement, being independent of the actual fix.
The preferred approach would be:
- submit the fix to net
- submit the improvement in a separate patch to net-next

> Suggested-by: Heiner Kallweit <hkallweit1@...il.com>
> Fixes: 0ba78b4a4989 ("net: ethernet: ave: Add suspend/resume support")
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> ---
>  drivers/net/ethernet/socionext/sni_ave.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/socionext/sni_ave.c b/drivers/net/ethernet/socionext/sni_ave.c
> index 14cdd2e8373c..b4e0c57af7c3 100644
> --- a/drivers/net/ethernet/socionext/sni_ave.c
> +++ b/drivers/net/ethernet/socionext/sni_ave.c
> @@ -1271,6 +1271,8 @@ static int ave_init(struct net_device *ndev)
>  
>  	phy_support_asym_pause(phydev);
>  
> +	phydev->mac_managed_pm = true;
> +
>  	phy_attached_info(phydev);
>  
>  	return 0;
> @@ -1806,12 +1808,6 @@ static int ave_resume(struct device *dev)
>  	wol.wolopts = priv->wolopts;
>  	__ave_ethtool_set_wol(ndev, &wol);
>  
> -	if (ndev->phydev) {
> -		ret = phy_resume(ndev->phydev);
> -		if (ret)
> -			return ret;
> -	}
> -
>  	if (netif_running(ndev)) {
>  		ret = ave_open(ndev);
>  		netif_device_attach(ndev);