linux-kernel - [PATCH] leds: Avoid needless strlen() for attributes

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Date:	Fri, 1 Aug 2008 22:30:09 +0200 (CEST)
From:	Sven Wegener <sven.wegener@...aler.net>
To:	Richard Purdie <rpurdie@...ys.net>
cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] leds: Avoid needless strlen() for attributes

There's no need for the additional call to strlen(), we can directly return the
value returned by sprintf(). We now return a length value that doesn't include
the final '\0', but user space shouldn't bother about it anyway.

Signed-off-by: Sven Wegener <sven.wegener@...aler.net>
---
 drivers/leds/led-class.c     |    5 +----
 drivers/leds/ledtrig-timer.c |    8 ++------
 2 files changed, 3 insertions(+), 10 deletions(-)

Patch is based on your current (024e8ac) leds git tree head.

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 559a408..1aa24d3 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -34,14 +34,11 @@ static ssize_t led_brightness_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
-	ssize_t ret = 0;
 
 	/* no lock needed for this */
 	led_update_brightness(led_cdev);
-	sprintf(buf, "%u\n", led_cdev->brightness);
-	ret = strlen(buf) + 1;
 
-	return ret;
+	return sprintf(buf, "%u\n", led_cdev->brightness);
 }
 
 static ssize_t led_brightness_store(struct device *dev,
diff --git a/drivers/leds/ledtrig-timer.c b/drivers/leds/ledtrig-timer.c
index 5c99f4f..db68196 100644
--- a/drivers/leds/ledtrig-timer.c
+++ b/drivers/leds/ledtrig-timer.c
@@ -70,9 +70,7 @@ static ssize_t led_delay_on_show(struct device *dev,
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct timer_trig_data *timer_data = led_cdev->trigger_data;
 
-	sprintf(buf, "%lu\n", timer_data->delay_on);
-
-	return strlen(buf) + 1;
+	return sprintf(buf, "%lu\n", timer_data->delay_on);
 }
 
 static ssize_t led_delay_on_store(struct device *dev,
@@ -116,9 +114,7 @@ static ssize_t led_delay_off_show(struct device *dev,
 	struct led_classdev *led_cdev = dev_get_drvdata(dev);
 	struct timer_trig_data *timer_data = led_cdev->trigger_data;
 
-	sprintf(buf, "%lu\n", timer_data->delay_off);
-
-	return strlen(buf) + 1;
+	return sprintf(buf, "%lu\n", timer_data->delay_off);
 }
 
 static ssize_t led_delay_off_store(struct device *dev,
--
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