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Date: Sat, 9 Aug 2003 16:01:30 -0700
From: Kris Kennaway <kris@obsecurity.org>
To: Dmitry Sivachenko <mitya@cavia.pp.ru>
Message-ID: <20030809230129.GA7359@rot13.obsecurity.org>
References: <20030809181357.GA46208@fling-wing.demos.su>
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cc: current@freebsd.org
cc: sound@FreeBSD.org
Subject: Re: LOR in pcm
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On Sat, Aug 09, 2003 at 10:13:57PM +0400, Dmitry Sivachenko wrote:
> Hello!
>=20
> I have Chaintech Apogee 7VGL motherboard with on-board CMedia 8738 audio =
chip.
> Kernel identifies it as follows:
> pcm0: <CMedia CMI8738> port 0xe400-0xe4ff irq 10 at device 19.0 on pci0
>=20
> I am running very recent -current.
>=20
> When I am watching movies in mplayer, I get on the console from time to t=
ime:
>=20
> lock order reversal
>  1st 0xc4021c40 pcm0 (sound softc) @ /usr/src/sys/dev/sound/pci/cmi.c:520
>  2nd 0xc402c4c0 pcm0:play:0 (pcm channel) @ /usr/src/sys/dev/sound/pcm/ch=
annel.c

LORs in the pcm system are reported quite regularly, but I haven't
seen anyone working on the problem.  Is there anyone who can look at
the locking code used in this system and fix the problems?  Perhaps
this should be added to the 5.2 TODO list.
=20
Kris

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