129-regulator-core-return-zero-for-selectors-lower-than-.patch

From 0e933ffc049a0e181b5a6c3af1933976d6959ba9 Mon Sep 17 00:00:00 2001
From: Claudiu Beznea <claudiu.beznea@microchip.com>
Date: Wed, 25 Nov 2020 19:25:47 +0200
Subject: [PATCH 129/247] regulator: core: return zero for selectors lower than
 linear_min_sel

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 <jonathanh@nvidia.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/1606325147-606-1-git-send-email-claudiu.beznea@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/regulator/core.c    | 10 ++++++----
 drivers/regulator/helpers.c |  5 +++--
 2 files changed, 9 insertions(+), 6 deletions(-)

--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2984,9 +2984,10 @@ static int _regulator_list_voltage(struc
 		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);
@@ -3136,9 +3137,10 @@ int regulator_list_hardware_vsel(struct
 	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;
 
--- a/drivers/regulator/helpers.c
+++ b/drivers/regulator/helpers.c
@@ -647,9 +647,10 @@ int regulator_list_voltage_table(struct
 		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];
 }