[alsa-devel] 2.6.38+ hard lockup in pcm_lib.c
Clemens Ladisch
clemens at ladisch.de
Thu Mar 31 09:11:16 CEST 2011
Kelly Anderson wrote:
> I had a consistent hard-lockup on one of my machines, an Amd X6, just
> after Kdm loaded the desktop (most certainly when it decides to start
> talking to the sound card). Everything was dead, even ssh access to the
> computer. I git bisected it until I found the commit that was causing
> it. After reverting the patch everything is fine.
>
> commit 59ff878ffb26bc0be812ca8295799164f413ae88
> Author: Clemens Ladisch
> Date: Thu Nov 18 09:43:52 2010 +0100
>
> ALSA: pcm: detect xruns in no-period-wakeup mode
This looks as if you get an infinite loop, probably because
hw_ptr_buffer_jiffies is zero.
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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