netdev - Re: [PATCH] net: wwan: iosm: initialize pc_wwan->if

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Date:   Mon, 24 Oct 2022 13:14:39 +0400
From:   Sergey Ryazanov <ryazanov.s.a@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     M Chetan Kumar <m.chetan.kumar@...el.com>,
        Intel Corporation <linuxwwan@...el.com>,
        Loic Poulain <loic.poulain@...aro.org>,
        Johannes Berg <johannes@...solutions.net>,
        netdev@...r.kernel.org
Subject: Re: [PATCH] net: wwan: iosm: initialize pc_wwan->if_mutex earlier

On Mon, Oct 24, 2022 at 12:04 PM Hans de Goede <hdegoede@...hat.com> wrote:
> On 10/15/22 09:55, Sergey Ryazanov wrote:
>> On Fri, Oct 14, 2022 at 1:36 PM Hans de Goede <hdegoede@...hat.com> wrote:
>>> wwan_register_ops() ends up calls ipc_wwan_newlink() before it returns.
>>>
>>> ipc_wwan_newlink() uses pc_wwan->if_mutex, so we must initialize it
>>> before calling wwan_register_ops(). This fixes the following WARN()
>>> when lock-debugging is enabled:
>>>
>>> [skipped]
>>>
>>> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
>>
>> Should we add a Fixes: tag for this change? Besides this:
>
> This issue was present already in the driver as originally introduced, so:
>
> Fixes: 2a54f2c77934 ("net: iosm: net driver")
>
> I guess?

The wwan_register_ops() call has been here since the driver
introduction. But at that time, this call did not create any
interfaces. The issue was most probably introduced by my change:

83068395bbfc ("net: iosm: create default link via WWAN core")

after which the wwan_register_ops() call was modified in such a way
that it started calling ipc_wwan_newlink() internally.

-- 
Sergey