diff --git a/drivers/media/video/cx88/cx88-video.c b/drivers/media/video/cx88/cx88-video.c
index b993d42fe73c..d6d6d13a6a6b 100644
--- a/drivers/media/video/cx88/cx88-video.c
+++ b/drivers/media/video/cx88/cx88-video.c
@@ -926,8 +926,10 @@ static int video_release(struct file *file)
 	file->private_data = NULL;
 	kfree(fh);
 
+	mutex_lock(&dev->core->lock);
 	if(atomic_dec_and_test(&dev->core->users))
 		call_all(dev->core, tuner, s_standby);
+	mutex_unlock(&dev->core->lock);
 
 	return 0;
 }