[alsa-devel] [PATCH] Show processing coefficients in codec proc file

[Takashi Iwai]

At Thu, 19 Aug 2010 20:48:56 +0200,
David Henningsson wrote:
> 
> 2010-08-19 20:28, Takashi Iwai skrev:
> > At Thu, 19 Aug 2010 20:17:42 +0200,
> > David Henningsson wrote:
> >>
> >> This patch is helpful for tracking down bugs without having all
> >> information about the chip.
> > 
> > I don't want to change coef index in reading a proc file in general.
> 
> Good point. But I think the solution to that problem would be to
> - read current index
> - do the loop
> - restore current index
> 
> ...and perhaps protect that with an appropriate mutex (which one)?
> 
> > If any, you should implement a codec-specific hook.
> 
> I'm sorry, but I don't really see how that would help...?

If it's specific to a codec, then you know whether reading the coef
in that way can be harmful or not.  It's not only about the race
via proc file but also the influence of coef on the actual codec
behavior.


Takashi