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authorMark Hills <mark@pogo.org.uk>2009-10-24 12:59:36 +0100
committerTakashi Iwai <tiwai@suse.de>2009-10-30 12:29:42 +0100
commitac9dd9d384b018f1e1c5a9a2686ab5605ce55818 (patch)
tree4fad8ff7d5702231f0e01a4bd568d26b934223a1
parent3702b082281929cf1bdf14f67eb0619aab58b496 (diff)
ALSA: 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. Signed-off-by: Mark Hills <mark@pogo.org.uk> Acked-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/usb/caiaq/audio.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/usb/caiaq/audio.c b/sound/usb/caiaq/audio.c
index e76017c..86b2c3b 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