linux-kernel - [ 24/82] hwmon: (sht15) Check return value of regulator

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Message-Id: <20130318042146.676612230@decadent.org.uk>
Date:	Mon, 18 Mar 2013 04:22:08 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Guenter Roeck <linux@...ck-us.net>
Subject: [ 24/82] hwmon: (sht15) Check return value of regulator_enable()

3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: Mark Brown <broonie@...nsource.wolfsonmicro.com>

commit 3e78080f81481aa8340374d5a37ae033c1cf4272 upstream.

Not having power is a pretty serious error so check that we are able to
enable the supply and error out if we can't.

Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
[bwh: Backported to 3.2: driver does not use the devm API to manage
 memory, so goto err_free_data rather than returning on error]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/hwmon/sht15.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/hwmon/sht15.c
+++ b/drivers/hwmon/sht15.c
@@ -926,7 +926,13 @@ static int __devinit sht15_probe(struct
 		if (voltage)
 			data->supply_uV = voltage;
 
-		regulator_enable(data->reg);
+		ret = regulator_enable(data->reg);
+		if (ret != 0) {
+			dev_err(&pdev->dev,
+				"failed to enable regulator: %d\n", ret);
+			goto err_free_data;
+		}
+
 		/*
 		 * Setup a notifier block to update this if another device
 		 * causes the voltage to change


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