diff --git a/drivers/staging/media/omap4iss/iss_video.c b/drivers/staging/media/omap4iss/iss_video.c
index 63419b3769b5e792bea0435327490e08ec7092c2..68006231cc414db49ce04498ee36e5bd926ba351 100644
--- a/drivers/staging/media/omap4iss/iss_video.c
+++ b/drivers/staging/media/omap4iss/iss_video.c
@@ -243,12 +243,11 @@ __iss_video_get_format(struct iss_video *video, struct v4l2_format *format)
 	if (subdev == NULL)
 		return -EINVAL;
 
-	mutex_lock(&video->mutex);
-
 	fmt.pad = pad;
 	fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
-	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
 
+	mutex_lock(&video->mutex);
+	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
 	mutex_unlock(&video->mutex);
 
 	if (ret)