[alsa-devel] [PATCH 3/4] snd-usb-caiaq: Lock on stream start/unpause

Fix a bug which can result in white noise from the driver after stream start or unpause. --- sound/usb/caiaq/audio.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/sound/usb/caiaq/audio.c b/sound/usb/caiaq/audio.c index 9856c00..de9cf1e 100644 --- a/sound/usb/caiaq/audio.c +++ b/sound/usb/caiaq/audio.c @@ -62,10 +62,14 @@ static void activate_substream(struct snd_usb_caiaqdev *dev, struct snd_pcm_substream *sub) { + spin_lock(&dev->spinlock); + if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK) dev->sub_playback[sub->number] = sub; else dev->sub_capture[sub->number] = sub; + + spin_unlock(&dev->spinlock); }

static void