linux-kernel - Re: [PATCH] net: phy: corrected the return value for genphy_check_and_restart

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Date:   Tue, 25 Feb 2020 12:38:39 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Sudheesh Mavila <sudheesh.mavila@....com>
Cc:     andrew@...n.ch, f.fainelli@...il.com, hkallweit1@...il.com,
        davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: phy: corrected the return value for
 genphy_check_and_restart_aneg

On Tue, Feb 25, 2020 at 05:52:08PM +0530, Sudheesh Mavila wrote:
> When auto-negotiation is not required, return value should be zero.
> 
> Signed-off-by: Sudheesh Mavila <sudheesh.mavila@....com>

Hi,

Thanks for spotting this problem. However, it looks like the same
problem also exists in genphy_c45_check_and_restart_aneg(). It would
be a good idea to fix both at the same time.

Thanks.

> ---
>  drivers/net/phy/phy_device.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index 6a5056e0ae77..36cde3dac4c3 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -1806,10 +1806,13 @@ int genphy_check_and_restart_aneg(struct phy_device *phydev, bool restart)
>  			restart = true;
>  	}
>  
> -	if (restart)
> -		ret = genphy_restart_aneg(phydev);
> +	/* Only restart aneg if we are advertising something different
> +	 * than we were before.
> +	 */
> +	if (restart > 0)
> +		return genphy_restart_aneg(phydev);
>  
> -	return ret;
> +	return 0;
>  }
>  EXPORT_SYMBOL(genphy_check_and_restart_aneg);
>  
> -- 
> 2.17.1
> 
> 

-- 
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