[PATCH v8 3/3] ASoC: SOF: Fix deadlock when shutdown a frozen userspace

[Kai Vehmanen]

Hi,

On Thu, 1 Dec 2022, Ricardo Ribalda wrote:

> On Thu, 1 Dec 2022 at 14:22, 'Oliver Neukum' via Chromeos Kdump <chromeos-kdump at google.com> wrote:
> >
> > On 01.12.22 14:03, Ricardo Ribalda wrote:
> > > This patchset does not modify this behaviour. It simply fixes the
> > > stall for kexec().
> > >
> > > The  patch that introduced the stall:
> > > 83bfc7e793b5 ("ASoC: SOF: core: unregister clients and machine drivers
> > > in .shutdown")
> >
> > That patch is problematic. I would go as far as saying that
> > it needs to be reverted.
> 
> It fixes a real issue. We have not had any complaints until we tried
> to kexec in the platform.
> I wont recommend reverting it until we have an alternative implementation.
> 
> kexec is far less common than suspend/reboot.

I've posted an alternative to ALSA list that reverts the problematic
patch and fixes the problem (the patch was originally addressing)
in a different way:

https://mailman.alsa-project.org/pipermail/alsa-devel/2022-December/209776.html

No changes outside sound/soc/ are needed with this approach.

Br, Kai