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ALSA: snd-usb-caiaq: Lock on stream start/unpause

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Fix a bug which can result in white noise from the driver after stream
start or unpause.

Signed-off-by: Mark Hills <mark@pogo.org.uk>
Acked-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Mark Hills 2009-10-24 12:59:36 +01:00 committed by Takashi Iwai
parent 3702b08228
commit ac9dd9d384
1 changed files with 4 additions and 0 deletions
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4
sound/usb/caiaq/audio.c
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@ -62,10 +62,14 @@ static void
activate_substream(struct snd_usb_caiaqdev *dev, activate_substream(struct snd_usb_caiaqdev *dev,
struct snd_pcm_substream *sub) struct snd_pcm_substream *sub)
{ {
spin_lock(&dev->spinlock);
if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK) if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
dev->sub_playback[sub->number] = sub; dev->sub_playback[sub->number] = sub;
else else
dev->sub_capture[sub->number] = sub; dev->sub_capture[sub->number] = sub;
spin_unlock(&dev->spinlock);
} }
static void static void