linux-kernel - [PATCH] regulator: Use regulator_lock_supply() for get

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Message-Id: <1446531123-335-1-git-send-email-broonie@kernel.org>
Date:	Tue,  3 Nov 2015 06:12:03 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Liam Girdwood <lgirdwood@...il.com>,
	John Stultz <john.stultz@...aro.org>
Cc:	linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH] regulator: Use regulator_lock_supply() for get_voltage() too

Since we need to read voltages of parents as part of setting supply
voltages we need to be able to do get_voltage() internally without
taking locks so reorganize the locking to take locks on the full tree on
entry rather than as we recurse when called externally.

Reported-by: John Stultz <john.stultz@...aro.org>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 drivers/regulator/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index ff9cc3a6895f..97749c3330a4 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3110,7 +3110,7 @@ static int _regulator_get_voltage(struct regulator_dev *rdev)
 	} else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
 		ret = rdev->desc->fixed_uV;
 	} else if (rdev->supply) {
-		ret = regulator_get_voltage(rdev->supply);
+		ret = _regulator_get_voltage(rdev->supply);
 	} else {
 		return -EINVAL;
 	}
@@ -3133,11 +3133,11 @@ int regulator_get_voltage(struct regulator *regulator)
 {
 	int ret;
 
-	mutex_lock(&regulator->rdev->mutex);
+	regulator_lock_supply(regulator->rdev);
 
 	ret = _regulator_get_voltage(regulator->rdev);
 
-	mutex_unlock(&regulator->rdev->mutex);
+	regulator_unlock_supply(&regulator->rdev->mutex);
 
 	return ret;
 }
-- 
2.6.2

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