Context expectations in ALSA

[Maxime Ripard]

On Thu, Oct 22, 2020 at 12:03:19PM +0200, Jaroslav Kysela wrote:
> Dne 22. 10. 20 v 11:50 Maxime Ripard napsal(a):
> 
> > So, I'm not really sure what I'm supposed to do here. The drivers
> > involved don't appear to be doing anything extraordinary, but the issues
> > lockdep report are definitely valid too. What are the expectations in
> > terms of context from ALSA when running the callbacks, and how can we
> > fix it?
> 
> I think that you should set the non-atomic flag and wake up the workqueue or
> so from interrupt handler in this case. Call snd_pcm_period_elapsed() from the
> workqueue not the interrupt handler context.

Yeah, that was my first guess too. However, the DMA driver uses some
kind of generic helpers using a tasklet, so getting rid of it would take
some work and would very likely not be eligible for stable.

Maxime
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 228 bytes
Desc: not available
URL: <http://mailman.alsa-project.org/pipermail/alsa-devel/attachments/20201022/71cabcec/attachment-0001.sig>