4.9-stable review patch. If anyone has any objections, please let me know.
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From: Matthias Kaehlcke mka@chromium.org
[ Upstream commit fd086045559d90cd7854818b4c60a7119eda6231 ]
Commit 26988efe11b1 ("regulator: core: Allow to get voltage count and list from parent") introduces the propagation of the parent voltage count and list for regulators that don't provide this information themselves. The goal is to support simple switch regulators, however as a side effect normal continuous regulators can leak details of their supplies and provide consumers with inconsistent information.
Limit the propagation of the voltage count and list to switch regulators.
Fixes: 26988efe11b1 ("regulator: core: Allow to get voltage count and list from parent") Signed-off-by: Matthias Kaehlcke mka@chromium.org Reviewed-by: Javier Martinez Canillas javier@osg.samsung.com Tested-by: Javier Martinez Canillas javier@osg.samsung.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/regulator/core.c | 9 +++++++-- include/linux/regulator/driver.h | 2 ++ 2 files changed, 9 insertions(+), 2 deletions(-)
--- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -2465,7 +2465,7 @@ static int _regulator_list_voltage(struc ret = ops->list_voltage(rdev, selector); if (lock) mutex_unlock(&rdev->mutex); - } else if (rdev->supply) { + } else if (rdev->is_switch && rdev->supply) { ret = _regulator_list_voltage(rdev->supply, selector, lock); } else { return -EINVAL; @@ -2523,7 +2523,7 @@ int regulator_count_voltages(struct regu if (rdev->desc->n_voltages) return rdev->desc->n_voltages;
- if (!rdev->supply) + if (!rdev->is_switch || !rdev->supply) return -EINVAL;
return regulator_count_voltages(rdev->supply); @@ -4049,6 +4049,11 @@ regulator_register(const struct regulato mutex_unlock(®ulator_list_mutex); }
+ if (!rdev->desc->ops->get_voltage && + !rdev->desc->ops->list_voltage && + !rdev->desc->fixed_uV) + rdev->is_switch = true; + ret = device_register(&rdev->dev); if (ret != 0) { put_device(&rdev->dev); --- a/include/linux/regulator/driver.h +++ b/include/linux/regulator/driver.h @@ -425,6 +425,8 @@ struct regulator_dev { struct regulator_enable_gpio *ena_pin; unsigned int ena_gpio_state:1;
+ unsigned int is_switch:1; + /* time when this regulator was disabled last time */ unsigned long last_off_jiffy; };