X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;ds=sidebyside;f=drivers%2Fvideo%2Fbacklight%2Fbacklight.c;h=39394757679c0882f9a2765486163383bee0935c;hb=0c531360ed504aa0ce995fcb8ef08e82b6534d0b;hp=4840fe217e4d30edc8dcc41318720a6e6fede59d;hpb=547307420931344a868275bd7ea7a30f117a15a9;p=linux-2.6

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 4840fe217e..3939475767 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -94,8 +94,10 @@ static ssize_t backlight_store_power(struct device *dev,
 	mutex_lock(&bd->ops_lock);
 	if (bd->ops) {
 		pr_debug("backlight: set power to %d\n", power);
-		bd->props.power = power;
-		backlight_update_status(bd);
+		if (bd->props.power != power) {
+			bd->props.power = power;
+			backlight_update_status(bd);
+		}
 		rc = count;
 	}
 	mutex_unlock(&bd->ops_lock);
@@ -132,8 +134,10 @@ static ssize_t backlight_store_brightness(struct device *dev,
 		else {
 			pr_debug("backlight: set brightness to %d\n",
 				 brightness);
-			bd->props.brightness = brightness;
-			backlight_update_status(bd);
+			if (bd->props.brightness != brightness) {
+				bd->props.brightness = brightness;
+				backlight_update_status(bd);
+			}
 			rc = count;
 		}
 	}