linux-kernel - [100/197] hwmon: (sht15) Properly handle the case CONFIG

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Date:	Thu, 22 Apr 2010 12:09:11 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jean Delvare <khali@...ux-fr.org>,
	Jonathan Cameron <jic23@....ac.uk>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [100/197] hwmon: (sht15) Properly handle the case CONFIG_REGULATOR=n

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Jean Delvare <khali@...ux-fr.org>

commit c7a78d2c2e2537fd24903e966f34aae50319d587 upstream.

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@...oirfairelinux.com>
Signed-off-by: Jean Delvare <khali@...ux-fr.org>
Cc: Jonathan Cameron <jic23@....ac.uk>
Acked-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/hwmon/sht15.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/hwmon/sht15.c
+++ b/drivers/hwmon/sht15.c
@@ -541,7 +541,12 @@ static int __devinit sht15_probe(struct
 /* 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 */


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