netdev - Re: [PATCH net] net: phy: fix phy_start to consider PHY_IGNORE

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Date:   Wed, 7 Feb 2018 20:39:20 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net] net: phy: fix phy_start to consider
 PHY_IGNORE_INTERRUPT

Am 07.02.2018 um 20:34 schrieb Florian Fainelli:
> 
> 
> On 02/07/2018 11:26 AM, Heiner Kallweit wrote:
>> Am 07.02.2018 um 20:06 schrieb Florian Fainelli:
>>>
>>>
>>> On 02/07/2018 10:44 AM, Heiner Kallweit wrote:
>>>> This condition wasn't adjusted when PHY_IGNORE_INTERRUPT (-2) was added
>>>> long ago. In case of PHY_IGNORE_INTERRUPT the MAC interrupt indicates
>>>> also PHY state changes and we should do what the symbol says.
>>>
>>> Do you use phy_enable_interrupts() to configure how the PHY interrupts
>>> will be flowing through the Ethernet MAC?
>>>
>> No. And I'm not sure I understand your question correctly.
> 
> No wonder, my question does not make sense, I read the test wrong.
> 
>> The change applies the same behavior as e.g. in phy_connect_direct()
>> where phy_start_interrupts() is called only if phy_dev->irq > 0.
> 
> Not enough coffee, your change is fine, could you consider using
> phy_interrupt_is_valid() instead for this test?
> 
Sure. I was considering this already however wasn't sure because
currently both ways to check for a valid interrupt are used in
phylib.

>>
>>>>
>>>> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
>>>> ---
>>>>  drivers/net/phy/phy.c | 2 +-
>>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
>>>> index f3313a129..50ed35a45 100644
>>>> --- a/drivers/net/phy/phy.c
>>>> +++ b/drivers/net/phy/phy.c
>>>> @@ -822,7 +822,7 @@ void phy_start(struct phy_device *phydev)
>>>>  		phy_resume(phydev);
>>>>  
>>>>  		/* make sure interrupts are re-enabled for the PHY */
>>>> -		if (phydev->irq != PHY_POLL) {
>>>> +		if (phydev->irq > 0) {
>>>>  			err = phy_enable_interrupts(phydev);
>>>>  			if (err < 0)
>>>>  				break;
>>>>
>>>
>>
>