From mboxrd@z Thu Jan  1 00:00:00 1970
From: Johannes Berg <johannes@sipsolutions.net>
Subject: Re: lockdep report at resume
Date: Mon, 23 Mar 2009 10:29:32 +0100
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On Fri, 2009-03-20 at 15:37 +0100, Jiri Kosina wrote:
> On Fri, 20 Mar 2009, Johannes Berg wrote:
>=20
> > > [20920.458587] =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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > > [20920.458944] [ INFO: possible circular locking dependency detected =
]
> > > [20920.459231] 2.6.29-rc3-wl-12787-g17d9115-dirty #38
> > > [20920.459449] ------------------------------------------------------=
-
> > > [20920.459736] events/0/9 is trying to acquire lock:
> > > [20920.459951]  (&dev->mutex){--..}, at: [<ffffffff804be0ac>] input_d=
isconnect_device+0x2c/0xf0
> > > [20920.460369]=20
> > > [20920.460370] but task is already holding lock:
> > > [20920.460637]  (&usbhid->reset_work){--..}, at: [<ffffffff8025a933>]=
 run_workqueue+0xb3/0x250
> > > [20920.461049]=20
> > > [20920.461050] which lock already depends on the new lock.
> > Ping? I just ran into it again on 2.6.29-rc8-wl-18593-gef1cb6f-dirty.
>=20
> I haven't still fully gone through the whole dependency chain, was quite=20
> overloaded lately, sorry.
>=20
> There is a patch from Oliver Neukum, that fixes workqueue usage semantics=
=20
> around hid_reset() on [1], could you please check whether it also fixes=20
> the report you are seeing? Thanks.
>=20
> [1] http://lkml.org/lkml/2009/3/18/39

That patch doesn't even apply against a current tree.

johannes

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