[PATCH v1] drivers:adp8870_bl: check the return value of adp8870_write

[Li Zhong]

Check and propagate the return value of adp8870_write() when it fails,
which is possible when SMBus writing byte fails.

Signed-off-by: Li Zhong <floridsleeves at gmail.com>
---
 drivers/video/backlight/adp8870_bl.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/video/backlight/adp8870_bl.c b/drivers/video/backlight/adp8870_bl.c
index 8b5213a39527..0eb4ae2ff592 100644
--- a/drivers/video/backlight/adp8870_bl.c
+++ b/drivers/video/backlight/adp8870_bl.c
@@ -567,9 +567,13 @@ static ssize_t adp8870_store(struct device *dev, const char *buf,
 		return ret;
 
 	mutex_lock(&data->lock);
-	adp8870_write(data->client, reg, val);
+	ret = adp8870_write(data->client, reg, val);
 	mutex_unlock(&data->lock);
 
+	if (ret) {
+		return ret;
+	}
+
 	return count;
 }
 
-- 
2.25.1