From b0b7d0280f977dee1bbff0a1b4cd0c50068d2371 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Tue, 20 Nov 2007 15:29:10 +0100
Subject: [PATCH] pcm - Limit the avail_min minimum size

Fix avail_min if it's less than period_size.  The too small avail_min
is simply useless and the cause of CPU hog with rate plugin.
---
 src/pcm/pcm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/pcm/pcm.c b/src/pcm/pcm.c
index 9ac132b6..142b4c62 100644
--- a/src/pcm/pcm.c
+++ b/src/pcm/pcm.c
@@ -5577,6 +5577,12 @@ int snd_pcm_sw_params_set_avail_min(snd_pcm_t *pcm, snd_pcm_sw_params_t *params,
 #endif
 {
 	assert(pcm && params);
+	/* Fix avail_min if it's below period size.  The period_size
+	 * defines the minimal wake-up timing accuracy, so it doesn't
+	 * make sense to set below that.
+	 */
+	if (val < pcm->period_size)
+		val = pcm->period_size;
 	params->avail_min = val;
 	return 0;
 }