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

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Message-ID: <Y4E3EOTXTE0PuY6B@lunn.ch>
Date:   Fri, 25 Nov 2022 22:43:44 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Xiaolei Wang <xiaolei.wang@...driver.com>
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 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.

	Andrew