backlight: Change the return type of backlight_update_status() to int

Backlight device returns the result of update_status(), but
backlight_update_status() ignores it. So the consumers cannot confirm the
result of their function call. This patch makes the result to be returned
back for consumers.

Signed-off-by: Hyungwon Hwang <human.hwang@samsung.com>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index adb14a8616df..1e7a69adbe6f 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -117,12 +117,16 @@ struct backlight_device {
         int use_count;
 };
 
-static inline void backlight_update_status(struct backlight_device *bd)
+static inline int backlight_update_status(struct backlight_device *bd)
 {
+        int ret = -ENOENT;
+
         mutex_lock(&bd->update_lock);
         if (bd->ops && bd->ops->update_status)
-                bd->ops->update_status(bd);
+                ret = bd->ops->update_status(bd);
         mutex_unlock(&bd->update_lock);
+
+        return ret;
 }
 
 extern struct backlight_device *backlight_device_register(const char *name,