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>

diff --git a/drivers/power/wm97xx_battery.c b/drivers/power/wm97xx_battery.c
index fa39e759a275a2a49ef7a0ceb306c4eee9c5abbf..6ea3cb5837c707963784555aabafe14c35b0b48a 100644 (file)
--- 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;