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	Tue, 24 Apr 2007 14:28:58 -0400
From: Michael Wu <flamingice@sourmilk.net>
To: Andy Green <andy@warmcat.com>
Subject: Re: [PATCH 03/13] mac80211: fix virtual interface related locking
Date: Tue, 24 Apr 2007 14:24:56 -0400
Cc: linux-wireless@vger.kernel.org
References: <20070423184811.7029.24949.stgit@magic.sourmilk.net> <200704231722.07280.flamingice@sourmilk.net> <462E47D0.8030800@warmcat.com>
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On Tuesday 24 April 2007 14:09, Andy Green wrote:
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> [ INFO: possible recursive locking detected ]
> 2.6.21-rc7 #11
> ---------------------------------------------
> ip/2600 is trying to acquire lock:
>   (&dev->_xmit_lock){-+..}, at: [<e09199c5>]
> ieee80211_set_multicast_list+0x46/0x167 [mac80211]
>
> but task is already holding lock:
>   (&dev->_xmit_lock){-+..}, at: [<c05abc05>] dev_mc_upload+0x14/0x3c
>
This is fine, though it would be nice if we can shut the warning off. Virtu=
al=20
interfaces can try to take the xmit lock of the master device, but the mast=
er=20
device will never try to take the xmit lock of the virtual interfaces and=20
especially not while holding its own xmit lock.

=2DMichael Wu

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