From 94ca269049e2a57107c3d7a3713e8bfd054a2153 Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Tue, 11 Dec 2018 18:22:28 +0200
Subject: [PATCH] scripts/check-config.sh: Add usage()

When arguments are not supplied the error message is misleading and
doesn't tell what exactly has to be done.

Fix this by adding usage() and call it if above circumstance occurs.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
 scripts/check-config.sh | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/scripts/check-config.sh b/scripts/check-config.sh
index 4848ca6e25..583f7d0963 100755
--- a/scripts/check-config.sh
+++ b/scripts/check-config.sh
@@ -17,6 +17,15 @@
 set -e
 set -u
 
+PROG_NAME="${0##*/}"
+
+usage() {
+	echo "$PROG_NAME <path to u-boot.cfg> <path to whitelist file> <source dir>"
+	exit 1
+}
+
+[ $# -ge 3 ] || usage
+
 path="$1"
 whitelist="$2"
 srctree="$3"
-- 
2.25.1