linux-kernel - Re: [PATCH] ath5k : ath5k_config

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Message-Id: <20080801011415.ff4821a3.akpm@linux-foundation.org>
Date:	Fri, 1 Aug 2008 01:14:15 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Jiri Slaby <jirislaby@...il.com>,
	Dave Young <hidave.darkstar@...il.com>,
	johannes@...solutions.net, tomasw@...il.com,
	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	ath5k-devel@...ema.h4ckr.net, me@...copeland.com,
	linville@...driver.com, stable@...nel.org
Subject: Re: [PATCH] ath5k : ath5k_config_interface deadlock fix

On Fri, 01 Aug 2008 11:03:37 +0300 Pekka Enberg <penberg@...helsinki.fi> wrote:

> Jiri Slaby wrote:
> > Dave Young napsal(a):
> >> In the drivers/net/wireless/ath5k/base.c, there's recursive locking of 
> >> sc->lock
> >> This casue the kernel stuck
> >>
> >> Bug report please see:
> >> http://lkml.org/lkml/2008/7/29/32
> >>
> >> Fixed it by remove the lock in sub routine "ath5k_beacon_update",
> >> The ath5k_config_interface is the only caller to it.
> >>
> >> [  171.430207] =============================================
> >> [  171.432140] [ INFO: possible recursive locking detected ]
> >> [  171.433113] 2.6.27-rc1-smp #4
> >> [  171.434079] ---------------------------------------------
> >> [  171.435039] ath5k_pci/2447 is trying to acquire lock:
> >> [  171.435990]  (&sc->lock){--..}, at: [<f89ee9b5>] 
> >> ath5k_config_interface+0xd5/0x340 [ath5k]
> >> [  171.437046] [  171.437048] but task is already holding lock:
> >> [  171.438903]  (&sc->lock){--..}, at: [<f89ee91d>] 
> >> ath5k_config_interface+0x3d/0x340 [ath5k]
> >> [  171.439953] [  171.439954] other info that might help us debug this:
> >> [  171.441795] 3 locks held by ath5k_pci/2447:
> >> [  171.442729]  #0:  ((name)){--..}, at: [<c013a122>] 
> >> run_workqueue+0x102/0x1d0
> >> [  171.443800]  #1:  (&(&local->scan_work)->work){--..}, at: 
> >> [<c013a122>] run_workqueue+0x102/0x1d0
> >> [  171.444859]  #2:  (&sc->lock){--..}, at: [<f89ee91d>] 
> >> ath5k_config_interface+0x3d/0x340 [ath5k]
> > 
> > Should be fixed already:
> > http://git.kernel.org/?p=linux/kernel/git/linville/wireless-2.6.git;a=commitdiff_plain;h=bc05116ab33d30342e2b4b1bcc6d6e1184e9df97 
> 
> I guess that didn't make it to -stable?

(cc stable!)
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