netdev - Re: [PATCH] phy: phy_ethtool_ksettings_set: Don't discard phy_start

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Date:   Mon, 8 Nov 2021 15:25:40 +0100
From:   Bastian Germann <bage@...utronix.de>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Russell King <linux@...linux.org.uk>, davem@...emloft.net,
        netdev@...r.kernel.org,
        Benedikt Spranger <b.spranger@...utronix.de>
Subject: Re: [PATCH] phy: phy_ethtool_ksettings_set: Don't discard
 phy_start_aneg's return

Am 06.11.21 um 22:52 schrieb Heiner Kallweit:
> On 05.11.2021 16:36, bage@...utronix.de wrote:
>> From: Bastian Germann <bage@...utronix.de>
>>
>> Take the return of phy_start_aneg into account so that ethtool will handle
>> negotiation errors and not silently accept invalid input.
>>
>> Fixes: 2d55173e71b0 ("phy: add generic function to support ksetting support")
>> Signed-off-by: Bastian Germann <bage@...utronix.de>
>> Reviewed-by: Benedikt Spranger <b.spranger@...utronix.de>
> 
> In addition to what Andrew said already:
> 
> - This patch won't apply on net due to a4db9055fdb9.

Hi Heiner,

Thanks for your remarks. I would have gotten the first one right if the netdev
tree was documented in the MAINTAINERS file (T: ...) and not only in netdev-FAQ.

Maybe you want to address that.

Thanks,
Bastian

> - Patch misses the "net" annotation.
> - Prefix should be "net: phy:", not "phy:".
> 
> At least the formal aspects should have been covered by the internal review.
> 
>> ---
>>   drivers/net/phy/phy.c | 6 ++++--
>>   1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
>> index a3bfb156c83d..f740b533abba 100644
>> --- a/drivers/net/phy/phy.c
>> +++ b/drivers/net/phy/phy.c
>> @@ -770,6 +770,8 @@ static int phy_poll_aneg_done(struct phy_device *phydev)
>>   int phy_ethtool_ksettings_set(struct phy_device *phydev,
>>   			      const struct ethtool_link_ksettings *cmd)
>>   {
>> +	int ret = 0;
> 
> Why initializing ret?
> 
>> +
>>   	__ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
>>   	u8 autoneg = cmd->base.autoneg;
>>   	u8 duplex = cmd->base.duplex;
>> @@ -815,10 +817,10 @@ int phy_ethtool_ksettings_set(struct phy_device *phydev,
>>   	phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl;
>>   
>>   	/* Restart the PHY */
>> -	_phy_start_aneg(phydev);
>> +	ret = _phy_start_aneg(phydev);
>>   
>>   	mutex_unlock(&phydev->lock);
>> -	return 0;
>> +	return ret;
>>   }
>>   EXPORT_SYMBOL(phy_ethtool_ksettings_set);
>>   
>>
>