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-rw-r--r--sound/usb/pcm.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 8ed165f036a0..9557bd4d1bbc 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -604,6 +604,7 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_usb_substream *subs = runtime->private_data;
struct snd_usb_audio *chip = subs->stream->chip;
+ int retry = 0;
int ret;
ret = snd_usb_lock_shutdown(chip);
@@ -614,6 +615,7 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
goto unlock;
}
+ again:
if (subs->sync_endpoint) {
ret = snd_usb_endpoint_prepare(chip, subs->sync_endpoint);
if (ret < 0)
@@ -638,9 +640,16 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
subs->lowlatency_playback = lowlatency_playback_available(runtime, subs);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
- !subs->lowlatency_playback)
+ !subs->lowlatency_playback) {
ret = start_endpoints(subs);
-
+ /* if XRUN happens at starting streams (possibly with implicit
+ * fb case), restart again, but only try once.
+ */
+ if (ret == -EPIPE && !retry++) {
+ sync_pending_stops(subs);
+ goto again;
+ }
+ }
unlock:
snd_usb_unlock_shutdown(chip);
return ret;