[PATCH] backlight: (adp8870) fix a missing check for adp8870_write

[Kangjie Lu]

adp8870_write() may fail. This fix checks if adp8870_write fails, and if
so, returns its error code.

Signed-off-by: Kangjie Lu <k...@umn.edu>
---
 drivers/video/backlight/adp8870_bl.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/video/backlight/adp8870_bl.c 
b/drivers/video/backlight/adp8870_bl.c
index 8d50e0299578..79901fb4fcd1 100644
--- a/drivers/video/backlight/adp8870_bl.c
+++ b/drivers/video/backlight/adp8870_bl.c
@@ -811,9 +811,14 @@ static ssize_t adp8870_bl_ambient_light_zone_store(struct 
device *dev,
                if (!ret) {
                        reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
                        reg_val |= (val - 1) << CFGR_BLV_SHIFT;
-                       adp8870_write(data->client, ADP8870_CFGR, reg_val);
-               }
-               mutex_unlock(&data->lock);
+                       ret = adp8870_write(data->client,
+                                       ADP8870_CFGR, reg_val);
+                       if (ret) {
+                               mutex_unlock(&data->lock);
+                               return ret;
+                       }
+               }       else
+                       mutex_unlock(&data->lock);
        }
 
        return count;
-- 
2.17.2 (Apple Git-113)