[alsa-devel] snd_pcsp locking mess

Stas Sergeev stsp at aknet.ru
Tue May 27 15:47:19 CEST 2008


Takashi Iwai wrote:
> No, close callback is always after the hw_free callback.
> So, in hw_free callback, you just need to assure that hrtimer callback
> is finished (and/or cancel it).  After that, you are free to work
> without considering hrtimer stuff.
Here is my first attempt on that.
The optimization you mention above
is possible, but I haven't done it
(yet). Because I think it will obscure
I can't really say if this code is
better than before - it looks cleaner
but adds 3 locks.

> We don't drop pcm substream lock here because we don't need to acquire
> it.
Why not? Because it is not recommended
to use any more, or for some other
reason? I mostly need the hrtimer
callback to be protected from all
the pcm callbacks, modulo the (IMO
questionable) optimization. So why
not would I just use the substream
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