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hwmon: (pmbus) Add mutex locking for sysfs reads

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As part of commit a919ba0697 ("hwmon: (pmbus) Stop caching register
values"), the update of the sensor value is now triggered directly by the
sensor attribute value being read from sysfs. This created (or at least
made much more likely) a locking issue, since nothing protected the device
page selection from being unexpectedly modified by concurrent reads. If
sensor values on different pages on the same device were being concurrently
read by multiple threads, this could cause spurious read errors due to the
page register not reading back the same value last written, or sensor
values being read from the incorrect page.

Add locking of the update_lock mutex in pmbus_show_sensor and
pmbus_show_samples so that these cannot result in concurrent reads from the
underlying device.

Fixes: a919ba0697 ("hwmon: (pmbus) Stop caching register values")
Signed-off-by: Robert Hancock <robert.hancock@calian.com>
Reviewed-by: Alex Qiu <xqiu@google.com>
Link: https://lore.kernel.org/r/20201103193315.3011800-1-robert.hancock@calian.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Robert Hancock 2020-11-03 13:33:15 -06:00 committed by Guenter Roeck
parent 402dab548d
commit 18e8db7f65
1 changed files with 10 additions and 3 deletions
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13
drivers/hwmon/pmbus/pmbus_core.c
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@ -941,12 +941,16 @@ static ssize_t pmbus_show_sensor(struct device *dev,
struct i2c_client *client = to_i2c_client(dev->parent);
struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
struct pmbus_data *data = i2c_get_clientdata(client);
ssize_t ret;
mutex_lock(&data->update_lock);
pmbus_update_sensor_data(client, sensor);
if (sensor->data < 0)
return sensor->data;
return snprintf(buf, PAGE_SIZE, "%lld\n", pmbus_reg2data(data, sensor));
ret = sensor->data;
else
ret = snprintf(buf, PAGE_SIZE, "%lld\n", pmbus_reg2data(data, sensor));
mutex_unlock(&data->update_lock);
return ret;
}
static ssize_t pmbus_set_sensor(struct device *dev,
@ -2012,8 +2016,11 @@ static ssize_t pmbus_show_samples(struct device *dev,
int val;
struct i2c_client *client = to_i2c_client(dev->parent);
struct pmbus_samples_reg *reg = to_samples_reg(devattr);
struct pmbus_data *data = i2c_get_clientdata(client);
mutex_lock(&data->update_lock);
val = _pmbus_read_word_data(client, reg->page, 0xff, reg->attr->reg);
mutex_unlock(&data->update_lock);
if (val < 0)
return val;