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

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Message-ID: <20110617135147.GA3470@linux-mips.org>
Date:	Fri, 17 Jun 2011 14:51:48 +0100
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	f6bvp <f6bvp@...e.fr>, linux-kernel@...r.kernel.org,
	Linux Netdev List <netdev@...r.kernel.org>,
	linux-hams@...r.kernel.org
Subject: Re: [AX25] inconsistent lock state

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.

  Ralf
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