[alsa-devel] [PATCH v2 00/10] ALSA: usb-audio: fix playback/capture concurrent usage
eldad at fogrefinery.com
Thu Aug 22 22:48:34 CEST 2013
On Thu, 22 Aug 2013, Eldad Zack wrote:
> On Thu, 22 Aug 2013, Daniel Mack wrote:
> > On 22.08.2013 19:43, Eldad Zack wrote:
> > > On Thu, 22 Aug 2013, Daniel Mack wrote:
> > >> On 21.08.2013 23:37, Eldad Zack wrote:
> > >>> Hi,
> > >>>
> > >>> This patch series attempts to fix a long starting problem with the concurrent
> > >>> usage of playback and capture on implicit feedback devices.
> > >>>
> > >>> Applies against current for-next (HEAD b43dd416be21bc8ad60984e13def032f01aaaa18 ).
> > >>
> > >> Thanks a lot for working on this! I'll give that series a test run tonight.
> > >
> > > That's great, thanks!
> > So, with your patches applied, I'm getting the NULL pointer Oops below
> > just by plugging in a UAC2 sound card.
> > Note that on this system, pulseaudio is running and grabs the new card
> > immediately, then closes it again. That might be different on your machine.
> > Do you want me to dig deeper or do you have an idea already?
> Oh, I think that data_endpoint just doesn't get initialized yet,
> because it opens and closes immediately.
> Does this fix it?
OK, I could easily reproduce this, though I don't have pulseaudio
installed. Luckily I started working on a regression tester, so I
modified it to just open and close (it's trivial, but if anyone is
interested, I can post it).
This fixes it for me.
Sorry about the oops and thank you very much for testing!
I also need to fix an error in the code (the altset_idx/altsetting issue
Clemens pointed out), so you might want to wait until I post a revised
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