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

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Message-ID: <4892C2CA.7010003@gmail.com>
Date:	Fri, 01 Aug 2008 10:01:14 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Dave Young <hidave.darkstar@...il.com>
CC:	johannes@...solutions.net, akpm@...ux-foundation.org,
	penberg@...helsinki.fi, tomasw@...il.com,
	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	ath5k-devel@...ts.ath5k.org
Subject: Re: [PATCH] ath5k : ath5k_config_interface deadlock fix

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
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