From 6192fa7109fb33591fa1078c8c1981e39da02d2d Mon Sep 17 00:00:00 2001
From: Mattia Dongili <malattia@linux.it>
Date: Tue, 5 Apr 2011 23:38:36 +0900
Subject: sony-laptop: report failures on setting LCD brightness

Check if we were successful in setting the requested brightness and
report failure in that case.

Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index 8f709ae..9d80ae4 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -966,9 +966,10 @@ static int sony_nc_update_status_ng(struct backlight_device *bd)
 	int *handle = (int *)bl_get_data(bd);
 
 	value = bd->props.brightness;
-	sony_call_snc_handle(*handle, 0x0100 | (value << 16), &result);
+	if (sony_call_snc_handle(*handle, 0x0100 | (value << 16), &result))
+		return -EIO;
 
-	return sony_nc_get_brightness_ng(bd);
+	return value;
 }
 
 static const struct backlight_ops sony_backlight_ops = {
-- 
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