diff --git a/drivers/media/video/em28xx/em28xx-audio.c b/drivers/media/video/em28xx/em28xx-audio.c
index 2c7343d3139d107af0f5e7509583c32c80e91158..8c67f678266aa83c35104e3f8f80e9e7395d8ebb 100644
--- a/drivers/media/video/em28xx/em28xx-audio.c
+++ b/drivers/media/video/em28xx/em28xx-audio.c
@@ -269,8 +269,11 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
 	dprintk("opening device and trying to acquire exclusive lock\n");
 
 	/* Sets volume, mute, etc */
+
 	dev->mute = 0;
+	mutex_lock(&dev->lock);
 	ret = em28xx_audio_analog_set(dev);
+	mutex_unlock(&dev->lock);
 	if (ret < 0)
 		goto err;
 
@@ -302,7 +305,9 @@ static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
 	dprintk("closing device\n");
 
 	dev->mute = 1;
+	mutex_lock(&dev->lock);
 	em28xx_audio_analog_set(dev);
+	mutex_unlock(&dev->lock);
 
 	if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
 		dprintk("audio users: %d\n", dev->adev->users);
diff --git a/drivers/media/video/em28xx/em28xx.h b/drivers/media/video/em28xx/em28xx.h
index 9759a7330a5306634af2c7cd98357bd4a5ea0ac1..813c0af458d31781aafdba4a66a0083a13655a11 100644
--- a/drivers/media/video/em28xx/em28xx.h
+++ b/drivers/media/video/em28xx/em28xx.h
@@ -345,7 +345,6 @@ int em28xx_read_reg(struct em28xx *dev, u16 reg);
 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
 			  int len);
 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len);
-int em28xx_set_audio_source(struct em28xx *dev);
 int em28xx_audio_analog_set(struct em28xx *dev);
 
 int em28xx_colorlevels_set_default(struct em28xx *dev);