netdev - Re: netlink circular locking dependency

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Date:	Tue, 17 Jun 2008 13:24:10 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Marcel Holtmann <marcel@...tmann.org>, netdev@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, Thomas Graf <tgraf@...g.ch>
Subject: Re: netlink circular locking dependency

On Tue, Jun 17, 2008 at 03:07:44PM +0200, Patrick McHardy wrote:
> Jarek Poplawski wrote:
>> On Tue, Jun 17, 2008 at 02:50:19PM +0200, Patrick McHardy wrote:
>> ...
>>> Thanks for testing. Unfortunately the module unload races look
>>> more complicated to fix and I'm busy with other things, so it
>>> would great if someone else could fix this.
>>
>> Patrick, I wonder if simply adding an additional mutex e.g.
>> genl_lock_table() around all the rest (after your patch) genl_locks
>> could be enough until some major rework. This should prevent any
>> new races and there are no lockups, I guess?
>
> Not sure I understand you correctly, where exactly would
> this mutex be taken?

Around (before) each genl_lock(), so any change would need these two
locks. genl_lock() alone would work like read lock (plus cb change).
But, I can miss something... Of course, it's meant as a temporary
solution, until Thomas does it right.

Jarek P.
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