Crash in acpi_ns_validate_handle triggered by soundwire on Linux 5.10

[Salvatore Bonaccorso]

Hi,

As an additional datapoint if this can help:

On Wed, Jan 20, 2021 at 04:28:23PM -0600, Pierre-Louis Bossart wrote:
> 
> 
> 
> > > Linux 5.10 fails to boot on my IceLake laptop, where 5.9 worked fine.
> > > I'm not sure whether it's a bug in ACPI or Soundwire subsystem, so I'm
> > > sending this to both
> > > lists. The W taint flag is because of an unrelated nouveau failure (It
> > > was busted on 5.9, and is
> > > still on 5.10). Full kernel log down below.
> > > It's from a distro kernel, but I can build my own kernel with patches if needed.
> > 
> > Please try to add a check for handle against NULL to
> > snd_intel_dsp_check_soundwire() after
> > 
> > handle = ACPI_HANDLE(&pci->dev);
> > 
> > and see if this makes any difference.
> > 
> > This should check handle against NULL anyway, even if it didn't crash later on.
> 
> Is there a way you can share the DSDT?
> 
> The only thing we do in that sdw_intel_acpi_scan() function is check for an
> _ADR and read two _DSD properties. I think it's been 2 years since we wrote
> it and never had an issue, never say never I guess...
> 
> If you want to bypass this problem for the time being, you can add a kernel
> option in /etc/modprobe.d/alsa-base.conf
> 
> options snd-intel-dspcfg dsp_driver=1
> 
> that will force the use of the HDaudio legacy driver and bypass the driver
> autodetection.

A user in Debian,  Kubo Hiroshi reported what seems to be the same
issue in https://bugs.debian.org/981003 .

Regards,
Salvatore