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ALSA: usb-audio: ignore delay calculation for capture stream

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It doesn't make sense to calculate the delay for capture streams in
the current implementation.  It's always zero, so we should skip the
computation in snd_usb_pcm_pointer() in the case of capture.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2012-11-23 14:28:42 +01:00
parent ffe4d12b15
commit 3f94fad095
1 changed files with 2 additions and 1 deletions
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sound/usb/pcm.c
+2 -1
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@@ -75,7 +75,8 @@ static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream
return SNDRV_PCM_POS_XRUN;
spin_lock(&subs->lock);
hwptr_done = subs->hwptr_done;
substream->runtime->delay = snd_usb_pcm_delay(subs,
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
substream->runtime->delay = snd_usb_pcm_delay(subs,
substream->runtime->rate);
spin_unlock(&subs->lock);
return hwptr_done / (substream->runtime->frame_bits >> 3);