linux-kernel - [PATCH 2/8] regulator: core: create unlocked version of regulator_set

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Date:	Tue, 13 Oct 2015 12:45:25 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	linux-kernel@...r.kernel.org
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, kernel@...gutronix.de,
	alkml@...gutronix.de, Sascha Hauer <s.hauer@...gutronix.de>
Subject: [PATCH 2/8] regulator: core: create unlocked version of regulator_set_voltage

The unlocked version will be needed when we start propagating voltage
changes to the supply regulators.

Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
---
 drivers/regulator/core.c | 57 +++++++++++++++++++++++++++++-------------------
 1 file changed, 34 insertions(+), 23 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index bab426d..b814451 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2725,33 +2725,14 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
 	return ret;
 }
 
-/**
- * regulator_set_voltage - set regulator output voltage
- * @regulator: regulator source
- * @min_uV: Minimum required voltage in uV
- * @max_uV: Maximum acceptable voltage in uV
- *
- * Sets a voltage regulator to the desired output voltage. This can be set
- * during any regulator state. IOW, regulator can be disabled or enabled.
- *
- * If the regulator is enabled then the voltage will change to the new value
- * immediately otherwise if the regulator is disabled the regulator will
- * output at the new voltage when enabled.
- *
- * NOTE: If the regulator is shared between several devices then the lowest
- * request voltage that meets the system constraints will be used.
- * Regulator system constraints must be set for this regulator before
- * calling this function otherwise this call will fail.
- */
-int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
+static int regulator_set_voltage_unlocked(struct regulator *regulator,
+					  int min_uV, int max_uV)
 {
 	struct regulator_dev *rdev = regulator->rdev;
 	int ret = 0;
 	int old_min_uV, old_max_uV;
 	int current_uV;
 
-	mutex_lock(&rdev->mutex);
-
 	/* If we're setting the same range as last time the change
 	 * should be a noop (some cpufreq implementations use the same
 	 * voltage for multiple frequencies, for example).
@@ -2799,12 +2780,42 @@ int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
 		goto out2;
 
 out:
-	mutex_unlock(&rdev->mutex);
 	return ret;
 out2:
 	regulator->min_uV = old_min_uV;
 	regulator->max_uV = old_max_uV;
-	mutex_unlock(&rdev->mutex);
+
+	return ret;
+}
+
+/**
+ * regulator_set_voltage - set regulator output voltage
+ * @regulator: regulator source
+ * @min_uV: Minimum required voltage in uV
+ * @max_uV: Maximum acceptable voltage in uV
+ *
+ * Sets a voltage regulator to the desired output voltage. This can be set
+ * during any regulator state. IOW, regulator can be disabled or enabled.
+ *
+ * If the regulator is enabled then the voltage will change to the new value
+ * immediately otherwise if the regulator is disabled the regulator will
+ * output at the new voltage when enabled.
+ *
+ * NOTE: If the regulator is shared between several devices then the lowest
+ * request voltage that meets the system constraints will be used.
+ * Regulator system constraints must be set for this regulator before
+ * calling this function otherwise this call will fail.
+ */
+int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
+{
+	int ret = 0;
+
+	mutex_lock(&regulator->rdev->mutex);
+
+	ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV);
+
+	mutex_unlock(&regulator->rdev->mutex);
+
 	return ret;
 }
 EXPORT_SYMBOL_GPL(regulator_set_voltage);
-- 
2.6.1

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