1 files changed, 13 insertions, 3 deletions

diff --git a/sound/usb/caiaq/audio.c b/sound/usb/caiaq/audio.c
index 121af0644fd9..86b2c3b92df5 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
@@ -269,16 +273,22 @@ snd_usb_caiaq_pcm_pointer(struct snd_pcm_substream *sub)
 {
         int index = sub->number;
         struct snd_usb_caiaqdev *dev = snd_pcm_substream_chip(sub);
+        snd_pcm_uframes_t ptr;
+
+        spin_lock(&dev->spinlock);
 
         if (dev->input_panic || dev->output_panic)
-                return SNDRV_PCM_POS_XRUN;
+                ptr = SNDRV_PCM_POS_XRUN;
 
         if (sub->stream == SNDRV_PCM_STREAM_PLAYBACK)
-                return bytes_to_frames(sub->runtime,
+                ptr = bytes_to_frames(sub->runtime,
                                         dev->audio_out_buf_pos[index]);
         else
-                return bytes_to_frames(sub->runtime,
+                ptr = bytes_to_frames(sub->runtime,
                                         dev->audio_in_buf_pos[index]);
+
+        spin_unlock(&dev->spinlock);
+        return ptr;
 }
 
 /* operators for both playback and capture */