linux-kernel - Re: [AX25] inconsistent lock state

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Message-ID: <4DFB7352.1040706@free.fr>
Date:	Fri, 17 Jun 2011 17:31:30 +0200
From:	f6bvp <f6bvp@...e.fr>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Ralf Baechle <ralf@...ux-mips.org>, linux-kernel@...r.kernel.org,
	Linux Netdev List <netdev@...r.kernel.org>,
	linux-hams@...r.kernel.org
Subject: Re: [AX25] inconsistent lock state

Hi Arnd,

I will apply your patch with write_lock_bh only following your
remark about recursive call.

I agree that the error message did not appear systematically
when doing what I did i.e. unpluging the ethernet cable from
the computer interface.

However, I will perform the same a few times and see what happens.

Many thanks.

Bernard


Le 17/06/2011 16:11, Arnd Bergmann a écrit :
> On Friday 17 June 2011 15:51:48 Ralf Baechle wrote:
>> On Fri, Jun 17, 2011 at 03:36:15PM +0200, Arnd Bergmann wrote:
>>
>> (Removed Jarek from cc; his email bounces.)
>>
>>> The message hints that disc_data_lock is aquired with softirqs disabled,
>>> but does not itself disable softirqs, which can in rare circumstances
>>> lead to a deadlock.
>>>
>>> Does this fix it?
>> If so, drivers/net/hamradio.c, function sp_get() would probably need the
>> equivalent fix.  Same for drivers/net/ppp_async.c:ap_get() and sp_get() in
>> drivers/net/ppp_synctty.c.
> It seems that ppp_synctty.c is ok, it uses write_lock_irq() already,
> sixpack.c looks like it has the same bug as mkiss. I also realized
> after sending out the patch that only the write_lock needs to be
> changed to write_lock_bh, while read_lock can leave softirqs enabled
> because it can be called recursively.
>
> 	Arnd

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