This ensures the transfer loop won't waste a run to read
the few frames (if any) between start and hw_ptr update.
It will wait for the next interrupt with wait_for_avail().
Signed-off-by: Ricardo Biehl Pasquali <pasqualirb@xxxxxxxxx>
---
sound/core/pcm_lib.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 7f71c2449..40013b26f 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -2172,6 +2172,10 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
if (err < 0)
goto _end_unlock;
+ runtime->twake = runtime->control->avail_min ? : 1;
+ if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
+ snd_pcm_update_hw_ptr(substream);
+
if (!is_playback &&
runtime->status->state == SNDRV_PCM_STATE_PREPARED) {
if (size >= runtime->start_threshold) {
@@ -2185,10 +2189,8 @@ snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
}
}
- runtime->twake = runtime->control->avail_min ? : 1;
- if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
- snd_pcm_update_hw_ptr(substream);
avail = snd_pcm_avail(substream);
+
while (size > 0) {
snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
snd_pcm_uframes_t cont;
--
2.17.1
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