diff --git a/drivers/char/diag/diagchar_core.c b/drivers/char/diag/diagchar_core.c
index 9cee52fdf870..d6c92d6d417c 100644
--- a/drivers/char/diag/diagchar_core.c
+++ b/drivers/char/diag/diagchar_core.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2008-2018, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2008-2019, 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
@@ -3089,13 +3089,13 @@ static int diag_user_process_apps_data(const char __user *buf, int len,
 	mutex_lock(&apps_data_mutex);
 	mutex_lock(&driver->hdlc_disable_mutex);
 	hdlc_disabled = driver->p_hdlc_disabled[APPS_DATA];
+	mutex_unlock(&driver->hdlc_disable_mutex);
 	if (hdlc_disabled)
 		ret = diag_process_apps_data_non_hdlc(user_space_data, len,
 						      pkt_type);
 	else
 		ret = diag_process_apps_data_hdlc(user_space_data, len,
 						  pkt_type);
-	mutex_unlock(&driver->hdlc_disable_mutex);
 	mutex_unlock(&apps_data_mutex);
 
 	diagmem_free(driver, user_space_data, mempool);