netdev - Re: [PATCH 2/2] net: ethernet: bcmgenet: use phy_ethtool_{get|set}_link

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Date:	Tue, 5 Jul 2016 14:15:44 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Philippe Reynes <tremyfr@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] net: ethernet: bcmgenet: use
 phy_ethtool_{get|set}_link_ksettings

On 07/05/2016 02:07 PM, Philippe Reynes wrote:
> Hi Florian,
> 
> On 05/07/16 06:30, Florian Fainelli wrote:
>> Le 04/07/2016 16:03, David Miller a écrit :
>>> From: Philippe Reynes<tremyfr@...il.com>
>>> Date: Sun,  3 Jul 2016 17:33:57 +0200
>>>
>>>> There are two generics functions phy_ethtool_{get|set}_link_ksettings,
>>>> so we can use them instead of defining the same code in the driver.
>>>>
>>>> Signed-off-by: Philippe Reynes<tremyfr@...il.com>
>>>
>>> Applied.
>>>
>>
>> The transformation is not equivalent, we lost the checks on
>> netif_running() in the process, and those are here for a reason, if the
>> interface is down and therefore clock gated, MDIO accesses to the PHY
>> will simply fail outright and cause bus errors.
> 
> Oh, I see, I've missed this. Sorry for this mistake.
> We should revert this path.

Well, maybe better than that, actually put the check in the generic
functions, because if the link is down, aka netif_running() returns
false, link parameters cannot be reliably queried and they are invalid.
-- 
Florian