[alsa-devel] Questions on locking, snd-usb-caiaq

Daniel Mack daniel at caiaq.de
Tue Sep 22 06:53:56 CEST 2009

On Mon, Sep 21, 2009 at 03:35:06PM +0200, Takashi Iwai wrote:
> At Sun, 20 Sep 2009 13:07:05 +0100 (BST),
> Mark Hills wrote:
> > 
> > I fixed some race issues in snd-usb-caiaq, but have some questions on the 
> > interface between the driver and ALSA.
> > 
> > First fix is a lock in pointer(), which caused snd_pcm_update_hw_ptr_pos() 
> > to report an out of range buffer position (even though it was sucessfully 
> > corrected to zero).
> > 
> > Second is a lock as part of trigger(). On testing, this appears to fix an 
> > issue where white noise could sometimes be transferred by the driver.
> Both look fine to me.

To me as well, but I'm currently unable to test them. But I trust Mark -
he's been tracking that issue for a long time already and was the only
one so far observing this bug. If those patches fix it for him, they
should definitely go in. So assume my Acked-by: on them :)


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