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Date:   Thu, 21 Apr 2022 19:54:53 +0300
From:   Sergey Ryazanov <>
To:     Loic Poulain <>
Cc:     Tetsuo Handa <>,
        Johannes Berg <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,
        Paolo Abeni <>,
        Network Development <>
Subject: Re: [PATCH] wwan_hwsim: Avoid flush_scheduled_work() usage

Hello Loic,

On Wed, Apr 20, 2022 at 12:53 PM Loic Poulain <> wrote:
> On Wed, 20 Apr 2022 at 04:22, Tetsuo Handa
> <> wrote:
>> Flushing system-wide workqueues is dangerous and will be forbidden.
>> Replace system_wq with local wwan_wq.
>> Link:
> > Signed-off-by: Tetsuo Handa <>
> Could you add a 'Fixes' tag?

>From what I understand, an inaccurate flushing of the system work
queue can potentially cause a system freeze. That is why
flush_scheduled_work() is planned to be removed. The hwsim module is
just a random function user without any known issues. So, a 'fixes'
tag is not required here, and there is no need to bother the stable
team with a change backport.

Anyway, Tetsuo, you missed a target tree in the subject. If this is
not a fix, then you probably should target your changes to the
'net-next' tree.


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