netdev - Re: [v2][PATCH 1/1] net: phy: Add link between phy dev and mac dev

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Date:   Sun, 27 Nov 2022 12:30:43 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     "Wang, Xiaolei" <xiaolei.wang@...driver.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [v2][PATCH 1/1] net: phy: Add link between phy dev and mac dev



On 11/25/2022 5:41 PM, Wang, Xiaolei wrote:
> add Florian
> 
> thanks
> 
> xiaolei
> 
> On 11/26/2022 5:43 AM, Andrew Lunn wrote:
>> CAUTION: This email comes from a non Wind River email account!
>> Do not click links or open attachments unless you recognize the sender 
>> and know the content is safe.
>>
>> On Fri, Nov 25, 2022 at 12:12:06PM +0800, Xiaolei Wang wrote:
>>> If the external phy used by current mac interface is
>>> managed by another mac interface, it means that this
>>> network port cannot work independently, especially
>>> when the system suspend and resume, the following
>>> trace may appear, so we should create a device link
>>> between phy dev and mac dev.
>>>
>>>    WARNING: CPU: 0 PID: 24 at drivers/net/phy/phy.c:983 
>>> phy_error+0x20/0x68
>>>    Modules linked in:
>>>    CPU: 0 PID: 24 Comm: kworker/0:2 Not tainted 
>>> 6.1.0-rc3-00011-g5aaef24b5c6d-dirty #34
>>>    Hardware name: Freescale i.MX6 SoloX (Device Tree)
>>>    Workqueue: events_power_efficient phy_state_machine
>>>    unwind_backtrace from show_stack+0x10/0x14
>>>    show_stack from dump_stack_lvl+0x68/0x90
>>>    dump_stack_lvl from __warn+0xb4/0x24c
>>>    __warn from warn_slowpath_fmt+0x5c/0xd8
>>>    warn_slowpath_fmt from phy_error+0x20/0x68
>>>    phy_error from phy_state_machine+0x22c/0x23c
>>>    phy_state_machine from process_one_work+0x288/0x744
>>>    process_one_work from worker_thread+0x3c/0x500
>>>    worker_thread from kthread+0xf0/0x114
>>>    kthread from ret_from_fork+0x14/0x28
>>>    Exception stack(0xf0951fb0 to 0xf0951ff8)
>>>
>>> Signed-off-by: Xiaolei Wang <xiaolei.wang@...driver.com>
>> This needs Florians review, since for v1 he thinks it will cause
>> regressions.

Please give me until Tuesday to give this patch some proper testing, thanks!
-- 
Florian