linux-kernel - [PATCH RFC leds + net-next 2/3] leds: trigger: return error value if .activate() failed

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Date:   Thu, 16 Jul 2020 19:17:29 +0200
From:   Marek Behún <marek.behun@....cz>
To:     linux-leds@...r.kernel.org
Cc:     Pavel Machek <pavel@....cz>, jacek.anaszewski@...il.com,
        Dan Murphy <dmurphy@...com>,
        Ondřej Jirman <megous@...ous.com>,
        netdev@...r.kernel.org, Russell King <linux@...linux.org.uk>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>, linux-kernel@...r.kernel.org,
        Marek Behún <marek.behun@....cz>
Subject: [PATCH RFC leds + net-next 2/3] leds: trigger: return error value if .activate() failed

Currently when the .activate() method fails and returns a negative error
code while writing to the /sys/class/leds/<LED>/trigger file, the write
system call does not inform the user abouth this failure.

This patch fixes this.

Signed-off-by: Marek Behún <marek.behun@....cz>
---
 drivers/leds/led-triggers.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 81e758d5a048..804e0d624f47 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -40,7 +40,7 @@ ssize_t led_trigger_write(struct file *filp, struct kobject *kobj,
 	struct device *dev = kobj_to_dev(kobj);
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct led_trigger *trig;
-	int ret = count;
+	int ret;
 
 	mutex_lock(&led_cdev->led_access);
 
@@ -58,7 +58,7 @@ ssize_t led_trigger_write(struct file *filp, struct kobject *kobj,
 	list_for_each_entry(trig, &trigger_list, next_trig) {
 		if (sysfs_streq(buf, trig->name) && trigger_relevant(led_cdev, trig)) {
 			down_write(&led_cdev->trigger_lock);
-			led_trigger_set(led_cdev, trig);
+			ret = led_trigger_set(led_cdev, trig);
 			up_write(&led_cdev->trigger_lock);
 
 			up_read(&triggers_list_lock);
@@ -71,7 +71,7 @@ ssize_t led_trigger_write(struct file *filp, struct kobject *kobj,
 
 unlock:
 	mutex_unlock(&led_cdev->led_access);
-	return ret;
+	return ret < 0 ? ret : count;
 }
 EXPORT_SYMBOL_GPL(led_trigger_write);
 
-- 
2.26.2