linux-kernel - Re: [PATCHv2 0/6] Motorola Droid 4 Audio Support

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Date:   Mon, 17 Jul 2017 22:48:33 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 0/6] Motorola Droid 4 Audio Support

* Sebastian Reichel <sebastian.reichel@...labora.co.uk> [170717 07:14]:
> Hi,
> 
> On Mon, Jul 17, 2017 at 03:17:10AM -0700, Tony Lindgren wrote:
> > * Sebastian Reichel <sebastian.reichel@...labora.co.uk> [170717 03:13]:
> > > On Mon, Jul 17, 2017 at 02:29:04AM -0700, Tony Lindgren wrote:
> > > > * Sebastian Reichel <sebastian.reichel@...labora.co.uk> [170712 08:19]:
> > > > >  * Switch from simple-audio-card to audio-graph-card
> > > > 
> > > > Gave this a quick try against v4.13-rc1 with SND_AUDIO_GRAPH_CARD
> > > > enabled as a loadable module. However loading it oopses for me,
> > > > see below. Maybe some dependencies are missing?
> > > 
> > > It works for me on top of v4.13-rc1 (my kernel is monolithic).
> > > Looking at the stacktrace it seems to be a bug in audio graph
> > > card and not in the codec driver.
> > 
> > OK I do also have:
> > 
> > CONFIG_DEBUG_LOCKDEP=y
> > CONFIG_DEBUG_ATOMIC_SLEEP=y
> 
> I added those and I do not get a stacktrace for anything sound
> related and audio works. I noticed one issue in dapm routing,
> that I accidently added. That will be fixed in PATCHv3, but its
> in untestable path anyways (EXT capture, probably FM radio is
> connected to EXT).

Hmm maybe that was not with DEBUG_ATOMIC_SLEEP then? I also
verified it does not happen unless your dts patch
"ARM: dts: omap4-droid4: add soundcard" is applied.

I doubt that having it as loadable module makes any difference
here as it's the might_sleep() in __mutex_lock_common() producing
the BUG.

Regards,

Tony