diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index c4a9dafff81d..1eeb608e5903 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -2946,6 +2946,7 @@ static void lm90_alert(struct i2c_client *client, enum i2c_alert_protocol type,
 		 */
 		struct lm90_data *data = i2c_get_clientdata(client);
 
+		hwmon_lock(data->hwmon_dev);
 		if (!data->shutdown && (data->flags & LM90_HAVE_BROKEN_ALERT) &&
 		    (data->current_alarms & data->alert_alarms)) {
 			if (!(data->config & 0x80)) {
@@ -2955,6 +2956,7 @@ static void lm90_alert(struct i2c_client *client, enum i2c_alert_protocol type,
 			schedule_delayed_work(&data->alert_work,
 				max_t(int, HZ, msecs_to_jiffies(data->update_interval)));
 		}
+		hwmon_unlock(data->hwmon_dev);
 	} else {
 		dev_dbg(&client->dev, "Everything OK\n");
 	}