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hwmon: (lm90) Use worker for alarm notifications 

Reporting alarms using hwmon_notify_event() may result in a callback
from the thermal subsystem. This means that such notifications must
not hold the update lock to avoid a deadlock. To avoid this situation,
use a worker to handle notifications.

Reported-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Fixes: f6d0775119 ("hwmon: (lm90) Rework alarm/status handling")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2022-06-29 08:26:20 -07:00
Родитель 8f9eb10ff7
Коммит 5993b9887a
1 изменённых файлов: 13 добавлений и 5 удалений
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18
drivers/hwmon/lm90.c
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@ -693,6 +693,7 @@ struct lm90_data {
struct hwmon_chip_info chip;
struct mutex update_lock;
struct delayed_work alert_work;
struct work_struct report_work;
bool valid; /* true if register values are valid */
bool alarms_valid; /* true if status register values are valid */
unsigned long last_updated; /* in jiffies */
@ -1043,13 +1044,18 @@ static int lm90_update_limits(struct device *dev)
return 0;
}
static void lm90_report_alarms(struct device *dev, struct lm90_data *data)
static void lm90_report_alarms(struct work_struct *work)
{
u16 cleared_alarms = data->reported_alarms & ~data->current_alarms;
u16 new_alarms = data->current_alarms & ~data->reported_alarms;
struct lm90_data *data = container_of(work, struct lm90_data, report_work);
u16 cleared_alarms, new_alarms, current_alarms;
struct device *hwmon_dev = data->hwmon_dev;
struct device *dev = &data->client->dev;
int st, st2;
current_alarms = data->current_alarms;
cleared_alarms = data->reported_alarms & ~current_alarms;
new_alarms = current_alarms & ~data->reported_alarms;
if (!cleared_alarms && !new_alarms)
return;
@ -1101,7 +1107,7 @@ static void lm90_report_alarms(struct device *dev, struct lm90_data *data)
if (st2 & MAX6696_STATUS2_R2OT2)
hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_emergency_alarm, 2);
data->reported_alarms = data->current_alarms;
data->reported_alarms = current_alarms;
}
static int lm90_update_alarms_locked(struct lm90_data *data, bool force)
@ -1143,7 +1149,7 @@ static int lm90_update_alarms_locked(struct lm90_data *data, bool force)
(data->config & 0x80);
if (force || check_enable)
lm90_report_alarms(&client->dev, data);
schedule_work(&data->report_work);
/*
* Re-enable ALERT# output if it was originally enabled, relevant
@ -2552,6 +2558,7 @@ static void lm90_restore_conf(void *_data)
struct i2c_client *client = data->client;
cancel_delayed_work_sync(&data->alert_work);
cancel_work_sync(&data->report_work);
/* Restore initial configuration */
if (data->flags & LM90_HAVE_CONVRATE)
@ -2769,6 +2776,7 @@ static int lm90_probe(struct i2c_client *client)
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
INIT_DELAYED_WORK(&data->alert_work, lm90_alert_work);
INIT_WORK(&data->report_work, lm90_report_alarms);
/* Set the device type */
if (client->dev.of_node)