Re: [PATCH v6 2/2] ASoC: SOF: Fix deadlock when shutdown a frozen userspace

On 11/30/22 09:47, Ricardo Ribalda wrote:

During kexec(), the userspace is frozen. Therefore we cannot wait for it to complete.

Avoid running snd_sof_machine_unregister during shutdown.

That's not what you are doing below - you only unregister clients conditionally.

I don't know if that's a stale commit message and can't reconcile it either with the initial discussions in this thread where we were referring to snd_card_disconnect(), etc?

Confused.

@@ -484,7 +485,8 @@ int snd_sof_device_shutdown(struct device *dev) * make sure clients and machine driver(s) are unregistered to force * all userspace devices to be closed prior to the DSP shutdown sequence */

• sof_unregister_clients(sdev);

• if (!kexec_with_frozen_processes())

• sof_unregister_clients(sdev);
  
  

  snd_sof_machine_unregister(sdev, pdata);