linux-kernel - Re: Linux 2.6.38 freeze because of sound/core/pcm_lib.c commit 59ff878ffb26bc0be812ca8295799164f413ae88

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Message-ID: <4D946C73.4090402@ladisch.de>
Date:	Thu, 31 Mar 2011 13:58:43 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	"Christopher K." <c.krooss@...glemail.com>
CC:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: Linux 2.6.38 freeze because of sound/core/pcm_lib.c commit 59ff878ffb26bc0be812ca8295799164f413ae88

Christopher K. wrote:
> Kernel 2.6.38 has been freezing ever since rc1 on my asus p7p55d.
> After booting up, the kernel seems to use a lot of cpu-time and after
> 20-30 seconds
> the system comes to a complete halt.
> 
> I just finished bisecting 2.6.37 - 2.6.38-rc1 and found this commit to
> be responsible:
> 
> 59ff878ffb26bc0be812ca8295799164f413ae88

Please try this patch:

--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -425,6 +425,8 @@ static int snd_pcm_hw_params(struct snd_
 	runtime->no_period_wakeup =
 			(params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
 			(params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
+	runtime->hw_ptr_buffer_jiffies =
+			max(1uL, (runtime->buffer_size * HZ) / runtime->rate);
 
 	bits = snd_pcm_format_physical_width(runtime->format);
 	runtime->sample_bits = bits;
@@ -866,8 +868,6 @@ static void snd_pcm_post_start(struct sn
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	snd_pcm_trigger_tstamp(substream);
 	runtime->hw_ptr_jiffies = jiffies;
-	runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 
-							    runtime->rate;
 	runtime->status->state = state;
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 	    runtime->silence_size > 0)
--
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