linux-kernel - regulator: regulator_get behaviour without CONFIG

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Date:	Fri, 2 Apr 2010 11:47:50 -0400 (EDT)
From:	Jerome Oufella <jerome.oufella@...oirfairelinux.com>
To:	Liam Girdwood <lrg@...mlogic.co.uk>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	lm-sensors <lm-sensors@...sensors.org>,
	linux-kernel@...r.kernel.org
Subject: regulator: regulator_get behaviour without CONFIG_REGULATOR set

Hi,

Working on drivers/hwmon/sht15.c, I noticed it would return bogus temperatures in my case, where CONFIG_REGULATOR is not set.

This is due to the following section in drivers/hwmon/sht15.c:

/* If a regulator is available, query what the supply voltage actually is!*/
        data->reg = regulator_get(data->dev, "vcc");
        if (!IS_ERR(data->reg)) {
            ...

Looking at consumer.h, it appears that regulator_get() returns a pointer to its second argument when CONFIG_REGULATOR is not set.

What would be the proper way to determine if the returned value is a valid regulator ?
Would it be safe to check it against the 2nd argument ?

Regards
Jerome Oufella
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