[PATCH] regulator: core: return zero for selectors lower than linear_min_sel

[Claudiu Beznea]

Selectors lower than linear_min_sel should not be considered invalid.
Thus return zero in case _regulator_list_voltage(),
regulator_list_hardware_vsel() or regulator_list_voltage_table()
receives such selectors as argument.

Fixes: bdcd1177578c ("regulator: core: validate selector against 
linear_min_sel")
Reported-by: Jon Hunter <jonath...@nvidia.com>
Signed-off-by: Claudiu Beznea <claudiu.bez...@microchip.com>
---
 drivers/regulator/core.c    | 10 ++++++----
 drivers/regulator/helpers.c |  5 +++--
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 216b0cbce199..ca03d8e70bd1 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2956,9 +2956,10 @@ static int _regulator_list_voltage(struct regulator_dev 
*rdev,
                return rdev->desc->fixed_uV;
 
        if (ops->list_voltage) {
-               if (selector >= rdev->desc->n_voltages ||
-                   selector < rdev->desc->linear_min_sel)
+               if (selector >= rdev->desc->n_voltages)
                        return -EINVAL;
+               if (selector < rdev->desc->linear_min_sel)
+                       return 0;
                if (lock)
                        regulator_lock(rdev);
                ret = ops->list_voltage(rdev, selector);
@@ -3108,9 +3109,10 @@ int regulator_list_hardware_vsel(struct regulator 
*regulator,
        struct regulator_dev *rdev = regulator->rdev;
        const struct regulator_ops *ops = rdev->desc->ops;
 
-       if (selector >= rdev->desc->n_voltages ||
-           selector < rdev->desc->linear_min_sel)
+       if (selector >= rdev->desc->n_voltages)
                return -EINVAL;
+       if (selector < rdev->desc->linear_min_sel)
+               return 0;
        if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
                return -EOPNOTSUPP;
 
diff --git a/drivers/regulator/helpers.c b/drivers/regulator/helpers.c
index 974f1a63993d..f42b394a0c46 100644
--- a/drivers/regulator/helpers.c
+++ b/drivers/regulator/helpers.c
@@ -647,9 +647,10 @@ int regulator_list_voltage_table(struct regulator_dev 
*rdev,
                return -EINVAL;
        }
 
-       if (selector >= rdev->desc->n_voltages ||
-           selector < rdev->desc->linear_min_sel)
+       if (selector >= rdev->desc->n_voltages)
                return -EINVAL;
+       if (selector < rdev->desc->linear_min_sel)
+               return 0;
 
        return rdev->desc->volt_table[selector];
 }
-- 
2.7.4