regulator: Don't report zero volts for the fixed voltage regulator

If we don't know what voltage the regulator is set to return an error
rather than reporting zero volts.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
index 21ecf212a522..ccbead06c8f3 100644
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -80,7 +80,10 @@ static int fixed_voltage_get_voltage(struct regulator_dev *dev)
 {
         struct fixed_voltage_data *data = rdev_get_drvdata(dev);
 
-        return data->microvolts;
+        if (data->microvolts)
+                return data->microvolts;
+        else
+                return -EINVAL;
 }
 
 static int fixed_voltage_list_voltage(struct regulator_dev *dev,