[alsa-devel] [PATCH RFC 0/7] Allow multiple callbacks for hda_jack

[Takashi Iwai]

At Thu, 11 Sep 2014 17:14:00 +0200,
David Henningsson wrote:
> 
> 
> 
> On 2014-09-11 16:19, Takashi Iwai wrote:
> > Hi,
> >
> > this is a series of patches I quickly cooked up after the discussion
> > in this morning: the support of multiple callbacks per jack.
> >
> > The series is applied on top of the previous fix patch (ALSA: hda -
> > Fix invalid pin powermap without jack detection).  It begins with
> > a couple of cleanups, then introduces the new hda_jack_callback
> > struct and the changes along with it, then ends with another
> > couple of cleanup patches based on the new infrastructure.
> >
> > I've tested only with a small set of devices, so far.
> 
> In general I like this idea and I remember thinking along the same lines.
> 
> I'm pondering whether we could use a more memory efficient layout for 
> the callback list. Like allocating a snd_array on codec level and have 
> indices to that list instead of pointers. Then the kernel would have 
> less memory blocks to worry about. What do you think?

I don't think the memory usage would be any problem in this case as
it's just a few numbers of small blocks.  The only question is which
is better manageable in the source code level.  Let's see...


Takashi