From a3eac76cdf7225aa1f87aa4514664f0372b9a1c1 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Fri, 1 Jul 2016 23:08:54 +0200
Subject: leds: triggers: return error if invalid trigger name is provided via
 sysfs

If an invalid trigger name is provided via sysfs currently no error
is returned. Therefore it's not possible to determine whether the
trigger was set successfully.
Fix this by returning -EINVAL if no trigger is matched.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>

diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 55fa65e..c92702a 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -60,6 +60,8 @@ ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
 			goto unlock;
 		}
 	}
+	/* we come here only if buf matches no trigger */
+	ret = -EINVAL;
 	up_read(&triggers_list_lock);
 
 unlock:
-- 
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