netdev - Re: unregister_netdevice: waiting for batadv_slave

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Message-ID: <5043679.31r3eYUQgx@ripper>
Date: Tue, 23 Sep 2025 17:01:30 +0200
From: Sven Eckelmann <sven@...fation.org>
To: Marek Lindner <marek.lindner@...lbox.org>,
 Simon Wunderlich <sw@...onwunderlich.de>,
 Antonio Quartulli <antonio@...delbit.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Simon Horman <horms@...nel.org>, b.a.t.m.a.n@...ts.open-mesh.org,
 Network Development <netdev@...r.kernel.org>,
 Linus Lüssing <linus.luessing@...3.blue>,
 Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Subject:
 Re: unregister_netdevice: waiting for batadv_slave_0 to become free. Usage
 count = 2

On Tuesday, 23 September 2025 16:45:48 CEST Tetsuo Handa wrote:
> On 2025/09/22 23:09, Tetsuo Handa wrote:
> > I suspect that batadv_hard_if_event_meshif() has something to do upon
> > NETDEV_UNREGISTER event because batadv_hard_if_event_meshif() receives
> > NETDEV_POST_INIT / NETDEV_REGISTER / NETDEV_UNREGISTER / NETDEV_PRE_UNINIT
> > events when this reproducer is executed, but I don't know what to do...
> 
> With a change show bottom, the reproducer no longer triggers this problem.
> But is this change correct?

Thanks for the debugging. I have some doubts that the move is correct - but I 
need to check this in detail when I have more time. Unfortunately, this will 
not happen before the end of the week. I hope this is ok for you.

Regards,
	Sven
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