linux-kernel - Re: [mmotm 2009-10-09-01-07] b43/wireless possible circular locking

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Message-Id: <1255254687.4095.46.camel@johannes.local>
Date:	Sun, 11 Oct 2009 11:51:27 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	akpm@...ux-foundation.org, bcm43xx-dev@...ts.berlios.de,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [mmotm 2009-10-09-01-07] b43/wireless possible circular locking

On Sun, 2009-10-11 at 17:41 +0800, Dave Young wrote:
> Hi,
> 
> I got lockdep warnings about possible circular lock with
> b43 interface startup. It looks like a real problem.
> 
> [   71.974542] wlan0: deauthenticating from 00:19:e0:db:24:de by local choice (reason=3)
> [   72.004352] b43-phy0 debug: Removing Interface type 2
> [   72.005431] 
> [   72.005435] =======================================================
> [   72.006168] [ INFO: possible circular locking dependency detected ]
> [   72.006759] 2.6.32-rc3-mm1 #4
> [   72.007047] -------------------------------------------------------
> [   72.007617] ifconfig/2175 is trying to acquire lock:
> [   72.007617]  (&(&rfkill->poll_work)->work){+.+...}, at: [<c0239375>] __cancel_work_timer+0x8c/0x18e
> [   72.007617] 
> [   72.007617] but task is already holding lock:
> [   72.007617]  (&wl->mutex){+.+.+.}, at: [<f8fa5359>] b43_op_stop+0x28/0x6a [b43]

I believe this is already taken care of by Larry.

johannes

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