diff --git a/drivers/media/platform/exynos4-is/fimc-capture.c b/drivers/media/platform/exynos4-is/fimc-capture.c
index 33c6a2f0ad74..1578aa4e4bb5 100644
--- a/drivers/media/platform/exynos4-is/fimc-capture.c
+++ b/drivers/media/platform/exynos4-is/fimc-capture.c
@@ -1855,6 +1855,8 @@ static void fimc_capture_subdev_unregistered(struct v4l2_subdev *sd)
 	if (fimc == NULL)
 		return;
 
+	mutex_lock(&fimc->lock);
+
 	fimc_unregister_m2m_device(fimc);
 	vdev = &fimc->vid_cap.ve.vdev;
 
@@ -1866,6 +1868,8 @@ static void fimc_capture_subdev_unregistered(struct v4l2_subdev *sd)
 	}
 	kfree(fimc->vid_cap.ctx);
 	fimc->vid_cap.ctx = NULL;
+
+	mutex_unlock(&fimc->lock);
 }
 
 static const struct v4l2_subdev_internal_ops fimc_capture_sd_internal_ops = {
diff --git a/drivers/media/platform/exynos4-is/fimc-lite.c b/drivers/media/platform/exynos4-is/fimc-lite.c
index 24e2a0f8797a..3f76f8abc4b3 100644
--- a/drivers/media/platform/exynos4-is/fimc-lite.c
+++ b/drivers/media/platform/exynos4-is/fimc-lite.c
@@ -1300,11 +1300,15 @@ static void fimc_lite_subdev_unregistered(struct v4l2_subdev *sd)
 	if (fimc == NULL)
 		return;
 
+	mutex_lock(&fimc->lock);
+
 	if (video_is_registered(&fimc->ve.vdev)) {
 		video_unregister_device(&fimc->ve.vdev);
 		media_entity_cleanup(&fimc->ve.vdev.entity);
 		fimc->ve.pipe = NULL;
 	}
+
+	mutex_unlock(&fimc->lock);
 }
 
 static const struct v4l2_subdev_internal_ops fimc_lite_subdev_internal_ops = {