[alsa-devel] Linux 2.6.38 freeze because of sound/core/pcm_lib.c commit 59ff878ffb26bc0be812ca8295799164f413ae88
Clemens Ladisch
clemens at ladisch.de
Thu Mar 31 13:58:43 CEST 2011
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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