linux-kernel - [PATCH 1/6] regulator: core: Add checking n_voltages if using list

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Message-ID: <1344562353.2996.1.camel@phoenix>
Date:	Fri, 10 Aug 2012 09:32:33 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Liam Girdwood <lrg@...com>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/6] regulator: core: Add checking n_voltages if using
 list_voltage() to read voltage regulators

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@...il.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



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