[PATCH v2 01/24] backlight: Silently fail backlight_update_status() if no device

[Sam Ravnborg]

backlight_update_status() may be called from code that does not have
any valid backlight device. To avoid ifdeffery and too much conditionals
silently fail if the backlight_device is NULL.

Signed-off-by: Sam Ravnborg <sam at ravnborg.org>
Cc: Lee Jones <lee.jones at linaro.org>
Cc: Daniel Thompson <daniel.thompson at linaro.org>
Cc: Jingoo Han <jingoohan1 at gmail.com>
---
 include/linux/backlight.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index 614653e07e3a..190963ffb7fc 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -348,6 +348,9 @@ static inline int backlight_update_status(struct backlight_device *bd)
 {
 	int ret = -ENOENT;
 
+	if (!bd)
+		return 0;
+
 	mutex_lock(&bd->update_lock);
 	if (bd->ops && bd->ops->update_status)
 		ret = bd->ops->update_status(bd);
-- 
2.25.1