[PATCH 5.15 012/207] ALSA: usb-audio: Dont start stream for capture at prepare

Greg Kroah-Hartman
2021-12-06T15:32:33Z

From: Takashi Iwai <tiwai@suse.de>

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>
---
sound/usb/pcm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -640,7 +640,8 @@ static int snd_usb_pcm_prepare(struct sn
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);