ALSA: usb-audio: Don't start stream for capture at prepare

commit 83de8f83816e8e15227dac985163e3d433a2bf9d upstream.

The recent change made mistakenly the stream for capture started at
prepare stage.  Add the stream direction check to avoid it.

Fixes: 9c9a3b9da891 ("ALSA: usb-audio: Rename early_playback_start flag with lowlatency_playback")
Link: https://lore.kernel.org/r/20211119102629.7476-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index f1f22e84c19169a02cb99f9668282b54630f4190..2e51fb031ae0182c89dd6d2ee00352d030ca857c 100644 (file)
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -640,7 +640,8 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
        runtime->delay = 0;
 
        subs->lowlatency_playback = lowlatency_playback_available(runtime, subs);
-       if (!subs->lowlatency_playback)
+       if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+           !subs->lowlatency_playback)
                ret = start_endpoints(subs);
 
  unlock: