netdev - Re: [PATCH net] Revert "net: phy: Correctly process PHY_HALTED in phy_stop

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Date:   Wed, 6 Sep 2017 17:51:29 +0200
From:   Mason <slash.tmp@...e.fr>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Marc Gonzalez <marc_gonzalez@...madesigns.com>,
        David Daney <ddaney.cavm@...il.com>,
        netdev <netdev@...r.kernel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        David Miller <davem@...emloft.net>,
        Mans Rullgard <mans@...sr.com>,
        Thibaud Cornic <thibaud_cornic@...madesigns.com>
Subject: Re: [PATCH net] Revert "net: phy: Correctly process PHY_HALTED in
 phy_stop_machine()"

On 31/08/2017 21:18, Florian Fainelli wrote:

> On 08/31/2017 12:09 PM, Mason wrote:
>
>> On 31/08/2017 19:03, Florian Fainelli wrote:
>>
>>> On 08/31/2017 05:29 AM, Marc Gonzalez wrote:
>>>
>>>> On 31/08/2017 02:49, Florian Fainelli wrote:
>>>>
>>>>> The original motivation for this change originated from Marc Gonzalez
>>>>> indicating that his network driver did not have its adjust_link callback
>>>>> executing with phydev->link = 0 while he was expecting it.
>>>>
>>>> I expect the core to call phy_adjust_link() for link changes.
>>>> This used to work back in 3.4 and was broken somewhere along
>>>> the way.
>>>
>>> If that was working correctly in 3.4 surely we can look at the diff and
>>> figure out what changed, even maybe find the offending commit, can you
>>> do that?
>>
>> Bisecting would a be a huge pain because my platform was
>> not upstream until v4.4
> 
> Then just diff the file and try to pinpoint which commit may have
> changed that?

Running 'ip link set eth0 down' on the command-line.

In v3.4 => adjust_link() callback is called
In v4.5 => adjust_link() callback is NOT called

$ git log --oneline --no-merges v3.4..v4.5 drivers/net/phy/phy.c | wc -l
59

I'm not sure what "just diff the file" entails.
I can't move 3.4 up, nor move 4.5 down.
I'm not even sure the problem comes from drivers/net/phy/phy.c
to be honest.

Regards.