[PATCH 1/6] regulator: core: Add checking n_voltages if using list_voltage() to read voltage regulators

[Axel Lin <axel.lin@gmail.com>]

Use list_voltage() to read single voltage regulators should be only applied to
single voltage regulators, thus add checking n_voltages for this case.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
---
 drivers/regulator/core.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 0fffeae..5469f9f 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2395,7 +2395,8 @@ static int _regulator_get_voltage(struct regulator_dev *rdev)
 		ret = rdev->desc->ops->list_voltage(rdev, sel);
 	} else if (rdev->desc->ops->get_voltage) {
 		ret = rdev->desc->ops->get_voltage(rdev);
-	} else if (rdev->desc->ops->list_voltage) {
+	} else if (rdev->desc->ops->list_voltage &&
+		   (rdev->desc->n_voltages == 1)) {
 		ret = rdev->desc->ops->list_voltage(rdev, 0);
 	} else {
 		return -EINVAL;
-- 
1.7.9.5