wm97xx_battery: Handle missing platform data gracefully

Don't unconditionally dereference the WM97xx core platform data since
it may not be present, causing an oops.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/power/wm97xx_battery.c b/drivers/power/wm97xx_battery.c
index fa39e759a275..6ea3cb5837c7 100644
--- a/drivers/power/wm97xx_battery.c
+++ b/drivers/power/wm97xx_battery.c
@@ -175,8 +175,14 @@ static int __devinit wm97xx_bat_probe(struct platform_device *dev)
                 dev_err(&dev->dev, "Do not pass platform_data through "
                         "wm97xx_bat_set_pdata!\n");
                 return -EINVAL;
-        } else
-                pdata = wmdata->batt_pdata;
+        }
+
+        if (!wmdata) {
+                dev_err(&dev->dev, "No platform data supplied\n");
+                return -EINVAL;
+        }
+
+        pdata = wmdata->batt_pdata;
 
         if (dev->id != -1)
                 return -EINVAL;