--- linux-2.6.21/sound/core/pcm_native.c.old	2007-05-12 11:30:06.000000000 +0400
+++ linux-2.6.21/sound/core/pcm_native.c	2007-05-20 01:22:45.000000000 +0400
@@ -922,8 +922,14 @@
 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 {
 	if (substream->runtime->trigger_master == substream &&
-	    snd_pcm_running(substream))
-		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
+	    snd_pcm_running(substream)) {
+		if (substream->ops->async_stop)
+			/* the driver provides a separate callback
+			 * for the IRQ context */
+			substream->ops->async_stop(substream);
+		else
+			substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
+	}
 	return 0; /* unconditonally stop all substreams */
 }
 
--- linux-2.6.21/include/sound/pcm.h.old	2007-05-12 11:30:01.000000000 +0400
+++ linux-2.6.21/include/sound/pcm.h	2007-05-20 01:21:29.000000000 +0400
@@ -68,6 +68,7 @@
 	int (*hw_free)(struct snd_pcm_substream *substream);
 	int (*prepare)(struct snd_pcm_substream *substream);
 	int (*trigger)(struct snd_pcm_substream *substream, int cmd);
+	int (*async_stop)(struct snd_pcm_substream *substream);
 	snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
 	int (*copy)(struct snd_pcm_substream *substream, int channel,
 		    snd_pcm_uframes_t pos,