[PATCH] regulator: Use regulator_lock_supply() for get_voltage() too

From: Mark Brown
Date: Tue Nov 03 2015 - 00:58:14 EST


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@xxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
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 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;
}
--
2.6.2

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