diff --git a/drivers/media/platform/msm/ais/camera/camera.c b/drivers/media/platform/msm/ais/camera/camera.c
index 3f477d50ceaf..afba7386a82b 100644
--- a/drivers/media/platform/msm/ais/camera/camera.c
+++ b/drivers/media/platform/msm/ais/camera/camera.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2012-2017, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -464,7 +464,9 @@ static int camera_v4l2_subscribe_event(struct v4l2_fh *fh,
 	int rc = 0;
 	struct camera_v4l2_private *sp = fh_to_private(fh);
 
+	mutex_lock(&sp->lock);
 	rc = v4l2_event_subscribe(&sp->fh, sub, 5, NULL);
+	mutex_unlock(&sp->lock);
 
 	return rc;
 }
@@ -475,7 +477,9 @@ static int camera_v4l2_unsubscribe_event(struct v4l2_fh *fh,
 	int rc = 0;
 	struct camera_v4l2_private *sp = fh_to_private(fh);
 
+	mutex_lock(&sp->lock);
 	rc = v4l2_event_unsubscribe(&sp->fh, sub);
+	mutex_unlock(&sp->lock);
 
 	return rc;
 }