linux-kernel - [PATCH] backlight: add CONFIG_PM_SLEEP to suspend/resume functions

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Message-id: <000201ce631f$d4ad0d50$7e0727f0$@samsung.com>
Date:	Fri, 07 Jun 2013 10:39:20 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Andrew Morton' <akpm@...ux-foundation.org>
Cc:	'Shuah Khan' <shuah.kh@...sung.com>, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, shuahkhan@...il.com,
	rpurdie@...ys.net, FlorianSchandinat@....de, plagnioj@...osoft.com,
	tomi.valkeinen@...com, rafael.j.wysocki@...el.com,
	'Arnd Bergmann' <arnd@...db.de>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: [PATCH] backlight: add CONFIG_PM_SLEEP to suspend/resume functions

Add CONFIG_PM_SLEEP to suspend/resume functions to fix the following
build warning when CONFIG_PM_SLEEP is not selected. This is because
sleep PM callbacks defined by SIMPLE_DEV_PM_OPS are only used when
the CONFIG_PM_SLEEP is enabled.

drivers/video/backlight/backlight.c:211:12: warning: 'backlight_suspend' defined but not used [-Wunused-function]
drivers/video/backlight/backlight.c:225:12: warning: 'backlight_resume' defined but not used [-Wunused-function]

Signed-off-by: Jingoo Han <jg1.han@...sung.com>
---
 drivers/video/backlight/backlight.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index cedbcbe..750807c 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -208,6 +208,7 @@ static ssize_t backlight_show_actual_brightness(struct device *dev,
 
 static struct class *backlight_class;
 
+#ifdef CONFIG_PM_SLEEP
 static int backlight_suspend(struct device *dev)
 {
 	struct backlight_device *bd = to_backlight_device(dev);
@@ -235,6 +236,7 @@ static int backlight_resume(struct device *dev)
 
 	return 0;
 }
+#endif
 
 static SIMPLE_DEV_PM_OPS(backlight_class_dev_pm_ops, backlight_suspend,
 			 backlight_resume);
-- 
1.7.10.4


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