From: Mark Brown <broonie@kernel.org>
Date: Tue, 3 Nov 2015 05:58:14 +0000 (+0000)
Subject: regulator: Use regulator_lock_supply() for get_voltage() too
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d9b96d35d2521342fdbcbc7468a0f7dcfaba4147;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

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@linaro.org>
Tested-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
---

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 771c6235cced..b4970eb85357 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3055,7 +3055,7 @@ 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->rdev);
 	} else {
 		return -EINVAL;
 	}
@@ -3078,11 +3078,11 @@ 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);
 
 	return ret;
 }