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hwmon: (pmbus) Add mutex to regulator ops

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[ Upstream commit 686d303ee6 ]

On PMBUS devices with multiple pages, the regulator ops need to be
protected with the update mutex. This prevents accidentally changing
the page in a separate thread while operating on the PMBUS_OPERATION
register.

Tested on Infineon xdpe11280 while a separate thread polls for sensor
data.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Marcello Sylvester Bauer <sylv@sylv.io>
Link: https://lore.kernel.org/r/b991506bcbf665f7af185945f70bf9d5cf04637c.1645804976.git.sylv@sylv.io
Fixes: ddbb4db4ce ("hwmon: (pmbus) Add regulator support")
Cc: Alan Tull <atull@opensource.altera.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Patrick Rudolph 2022-02-25 17:06:09 +01:00 committed by Greg Kroah-Hartman
parent 02f41752b3
commit 4a8b740713
1 changed files with 13 additions and 3 deletions
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16
drivers/hwmon/pmbus/pmbus_core.c
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@ -2391,10 +2391,14 @@ static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
{
struct device *dev = rdev_get_dev(rdev);
struct i2c_client *client = to_i2c_client(dev->parent);
struct pmbus_data *data = i2c_get_clientdata(client);
u8 page = rdev_get_id(rdev);
int ret;
mutex_lock(&data->update_lock);
ret = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
mutex_unlock(&data->update_lock);
if (ret < 0)
return ret;
@ -2405,11 +2409,17 @@ static int _pmbus_regulator_on_off(struct regulator_dev *rdev, bool enable)
{
struct device *dev = rdev_get_dev(rdev);
struct i2c_client *client = to_i2c_client(dev->parent);
struct pmbus_data *data = i2c_get_clientdata(client);
u8 page = rdev_get_id(rdev);
int ret;
return pmbus_update_byte_data(client, page, PMBUS_OPERATION,
PB_OPERATION_CONTROL_ON,
enable ? PB_OPERATION_CONTROL_ON : 0);
mutex_lock(&data->update_lock);
ret = pmbus_update_byte_data(client, page, PMBUS_OPERATION,
PB_OPERATION_CONTROL_ON,
enable ? PB_OPERATION_CONTROL_ON : 0);
mutex_unlock(&data->update_lock);
return ret;
}
static int pmbus_regulator_enable(struct regulator_dev *rdev)