Commit 686d303e authored by Patrick Rudolph's avatar Patrick Rudolph Committed by Guenter Roeck

hwmon: (pmbus) Add mutex to regulator ops

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: default avatarPatrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: default avatarMarcello Sylvester Bauer <sylv@sylv.io>
Link: https://lore.kernel.org/r/b991506bcbf665f7af185945f70bf9d5cf04637c.1645804976.git.sylv@sylv.io
Fixes: ddbb4db4 ("hwmon: (pmbus) Add regulator support")
Cc: Alan Tull <atull@opensource.altera.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 7e57714c
...@@ -2391,10 +2391,14 @@ static int pmbus_regulator_is_enabled(struct regulator_dev *rdev) ...@@ -2391,10 +2391,14 @@ static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
{ {
struct device *dev = rdev_get_dev(rdev); struct device *dev = rdev_get_dev(rdev);
struct i2c_client *client = to_i2c_client(dev->parent); struct i2c_client *client = to_i2c_client(dev->parent);
struct pmbus_data *data = i2c_get_clientdata(client);
u8 page = rdev_get_id(rdev); u8 page = rdev_get_id(rdev);
int ret; int ret;
mutex_lock(&data->update_lock);
ret = pmbus_read_byte_data(client, page, PMBUS_OPERATION); ret = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
mutex_unlock(&data->update_lock);
if (ret < 0) if (ret < 0)
return ret; return ret;
...@@ -2405,11 +2409,17 @@ static int _pmbus_regulator_on_off(struct regulator_dev *rdev, bool enable) ...@@ -2405,11 +2409,17 @@ static int _pmbus_regulator_on_off(struct regulator_dev *rdev, bool enable)
{ {
struct device *dev = rdev_get_dev(rdev); struct device *dev = rdev_get_dev(rdev);
struct i2c_client *client = to_i2c_client(dev->parent); struct i2c_client *client = to_i2c_client(dev->parent);
struct pmbus_data *data = i2c_get_clientdata(client);
u8 page = rdev_get_id(rdev); u8 page = rdev_get_id(rdev);
int ret;
return pmbus_update_byte_data(client, page, PMBUS_OPERATION, mutex_lock(&data->update_lock);
ret = pmbus_update_byte_data(client, page, PMBUS_OPERATION,
PB_OPERATION_CONTROL_ON, PB_OPERATION_CONTROL_ON,
enable ? PB_OPERATION_CONTROL_ON : 0); enable ? PB_OPERATION_CONTROL_ON : 0);
mutex_unlock(&data->update_lock);
return ret;
} }
static int pmbus_regulator_enable(struct regulator_dev *rdev) static int pmbus_regulator_enable(struct regulator_dev *rdev)
......
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