[Intel-gfx] [PATCH v2] ALSA: hda/i915 - avoid hung task timeout in i915 wait

[Tvrtko Ursulin]

On 09/03/2022 08:39, Kai Vehmanen wrote:
> Hi,
> 
> On Wed, 9 Mar 2022, Tvrtko Ursulin wrote:
> 
>>> -			/* 60s timeout */
>>
>> Where does this 60s come from and why is the fix to work around
>> DEFAULT_HUNG_TASK_TIMEOUT in a hacky way deemed okay? For instance would
>> limiting the wait here to whatever the kconfig is set to be an option?
> 
> this was discussed in
> https://lists.freedesktop.org/archives/intel-gfx/2022-February/290821.html
> ... and that thread concluded it's cleaner to split the wait than try
> to figure out hung-task configuration from middle of audio driver.
> 
> The 60sec timeout comes from 2019 patch "ALSA: hda: Extend i915 component
> bind timeout" to fix an issue reported by Paul Menzel (cc'ed).
> 
> This patch keeps the timeout intact.

I did not spot discussion touching on the point I raised.

How about not fight the hung task detector but mark your wait context as 
"I really know what I'm doing - not stuck trust me". Maybe using 
wait_for_completion_killable_timeout would do it since 
snd_hdac_i915_init is allowed to fail with an error already?

Regards,

Tvrtko