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backlight: Avoid unecessary driver callbacks

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Avoid driver callbacks when the brightness hasn't changed since
they're not necessary.

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
This commit is contained in:
Helge Deller 2008-01-13 23:01:13 +00:00 committed by Richard Purdie
parent 488b5ec871
commit 5155245379
1 changed files with 8 additions and 4 deletions
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12
drivers/video/backlight/backlight.c
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@ -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;
}
}