From: Jean Delvare <khali@linux-fr.org>
Date: Wed, 14 Apr 2010 14:14:08 +0000 (+0200)
Subject: hwmon: (sht15) Properly handle the case CONFIG_REGULATOR=n
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=c7a78d2c2e2537fd24903e966f34aae50319d587;p=openwrt%2Fstaging%2Fblogic.git

hwmon: (sht15) Properly handle the case CONFIG_REGULATOR=n

When CONFIG_REGULATOR isn't set, regulator_get_voltage() returns 0.
Properly handle this case by not trusting the value.

Reported-by: Jerome Oufella <jerome.oufella@savoirfairelinux.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@kernel.org
---

diff --git a/drivers/hwmon/sht15.c b/drivers/hwmon/sht15.c
index 9a15b1af1f11..a610e7880fb3 100644
--- a/drivers/hwmon/sht15.c
+++ b/drivers/hwmon/sht15.c
@@ -542,7 +542,12 @@ static int __devinit sht15_probe(struct platform_device *pdev)
 /* If a regulator is available, query what the supply voltage actually is!*/
 	data->reg = regulator_get(data->dev, "vcc");
 	if (!IS_ERR(data->reg)) {
-		data->supply_uV = regulator_get_voltage(data->reg);
+		int voltage;
+
+		voltage = regulator_get_voltage(data->reg);
+		if (voltage)
+			data->supply_uV = voltage;
+
 		regulator_enable(data->reg);
 		/* setup a notifier block to update this if another device
 		 *  causes the voltage to change */