linux-kernel - [PATCH] drivers/video/backlight/lp855x_bl.c: fix setting initial value for max

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Message-ID: <1329635302.4818.1.camel@phoenix>
Date:	Sun, 19 Feb 2012 15:08:22 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Richard Purdie <rpurdie@...ys.net>,
	"Milo(Woogyom) Kim" <milo.kim@...com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] drivers/video/backlight/lp855x_bl.c: fix setting initial
 value for max_brightness and brightness

Current code does not always ensure
pdata->initial_brightness <= pdata->max_brightness <= MAX_BRIGHTNESS.
Fix it.

Signed-off-by: Axel Lin <axel.lin@...il.com>
---
 drivers/video/backlight/lp855x_bl.c |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index d32c097..29a3af2 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -24,6 +24,7 @@
 
 #define BUF_SIZE		(20)
 #define DEFAULT_BL_NAME		"lcd-backlight"
+#define MAX_BRIGHTNESS		255
 
 struct lp855x {
 	const char *chipid;
@@ -171,10 +172,14 @@ static int lp855x_backlight_register(struct lp855x *lp)
 	char *name = pdata->name ? : DEFAULT_BL_NAME;
 
 	props.type = BACKLIGHT_PLATFORM;
+
+	if (pdata->max_brightness > MAX_BRIGHTNESS)
+		pdata->max_brightness = MAX_BRIGHTNESS;
+	props.max_brightness = pdata->max_brightness;
+
+	if (pdata->initial_brightness > pdata->max_brightness)
+		pdata->initial_brightness = pdata->max_brightness;
 	props.brightness = pdata->initial_brightness;
-	props.max_brightness =
-		(pdata->max_brightness < pdata->initial_brightness) ?
-		255 : pdata->max_brightness;
 
 	bl = backlight_device_register(name, lp->dev, lp,
 				       &lp855x_bl_ops, &props);
-- 
1.7.5.4



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