netdev - Re: [PATCH] net: mvneta: only do WoL speed down if the PHY is valid

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Date:   Thu, 21 May 2020 08:55:22 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Daniel González Cabanelas <dgcbueu@...il.com>,
        netdev@...r.kernel.org, davem@...emloft.net,
        thomas.petazzoni@...tlin.com
Subject: Re: [PATCH] net: mvneta: only do WoL speed down if the PHY is valid



On 5/21/2020 8:26 AM, Russell King - ARM Linux admin wrote:
> On Thu, May 21, 2020 at 05:19:16PM +0200, Andrew Lunn wrote:
>>>  drivers/net/ethernet/marvell/mvneta.c | 7 ++++---
>>>  1 file changed, 4 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
>>> index 41d2a0eac..f9170bc93 100644
>>> --- a/drivers/net/ethernet/marvell/mvneta.c
>>> +++ b/drivers/net/ethernet/marvell/mvneta.c
>>> @@ -3567,8 +3567,9 @@ static void mvneta_start_dev(struct mvneta_port *pp)
>>>  
>>>  	phylink_start(pp->phylink);
>>>  
>>> -	/* We may have called phy_speed_down before */
>>> -	phy_speed_up(pp->dev->phydev);
>>> +	if(pp->dev->phydev)
>>> +		/* We may have called phy_speed_down before */
>>> +		phy_speed_up(pp->dev->phydev);
>>
>> I don't think it is as simple as this. You should not really be mixing
>> phy_ and phylink_ calls within one driver. You might of noticed there
>> are no other phy_ calls in this driver. So ideally you want to add
>> phylink_ calls which do the right thing.
> 
> And... what is mvneta doing getting the phydev?  I removed all that
> code when converting it to phylink, since the idea with phylink is
> that the PHY is the responsibility of phylink not the network driver.
> 
> I hope the patch adding pp->dev->phydev hasn't been merged as it's
> almost certainly wrong.

This is already merged, this is a follow from a bisection that Andrew run.

There should be a phylink_phy_speed_{up,down} to maintain the PHYLINK
abstraction, and the functionality is useful beyond PHYLIB.
--
Florian