From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: Is there a function I can call from my ISR to tell
	ALSA to abort playback?
Date: Thu, 15 Nov 2007 12:45:17 +0100
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To: Timur Tabi <timur@freescale.com>
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At Thu, 15 Nov 2007 09:00:54 -0600,
Timur Tabi wrote:
> 
> Jaroslav Kysela wrote:
> 
> > Yes, call snd_pcm_stop() function. The call must be protected with 
> > snd_pcm_stream_lock... See to i2c/other/ak4117.c for an example.
> 
> That code calls snd_pcm_stop() from a timer, not an ISR.  Do I need the call to 
> wake_up() as well?

snd_pcm_stop() can be called from ISR, too (e.g.
snd_pcm_period_elapsed() may call snd_pcm_stop() when XRUN occurs).
You only need to protect it via snd_pcm_stream_lock*().


Takashi