diff options
| -rw-r--r-- | drivers/regulator/core.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 7a85ac9e32c5..1f9ff55b3620 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -132,6 +132,45 @@ static bool have_full_constraints(void) } /** + * regulator_lock_supply - lock a regulator and its supplies + * @rdev: regulator source + */ +static void regulator_lock_supply(struct regulator_dev *rdev) +{ + struct regulator *supply; + int i = 0; + + while (1) { + mutex_lock_nested(&rdev->mutex, i++); + supply = rdev->supply; + + if (!rdev->supply) + return; + + rdev = supply->rdev; + } +} + +/** + * regulator_unlock_supply - unlock a regulator and its supplies + * @rdev: regulator source + */ +static void regulator_unlock_supply(struct regulator_dev *rdev) +{ + struct regulator *supply; + + while (1) { + mutex_unlock(&rdev->mutex); + supply = rdev->supply; + + if (!rdev->supply) + return; + + rdev = supply->rdev; + } +} + +/** * of_get_regulator - get a regulator device node based on supply name * @dev: Device pointer for the consumer (of regulator) device * @supply: regulator supply name |