Commit b09a45601094 for kernel

commit b09a45601094c7f4ec4db8090b825fa61e169d93
Author: Guenter Roeck <linux@roeck-us.net>
Date:   Thu May 14 14:31:49 2026 -0700

    hwmon: (lm90) Stop work before releasing hwmon device

    Sashiko reports:

    In lm90_probe(), the devm action to cancel the alert_work and report_work
    (lm90_restore_conf) is registered in lm90_init_client() before
    devm_hwmon_device_register_with_info() is called.

    Because devm executes cleanup actions in reverse order during module
    unbind or probe failure, the hwmon device is unregistered and freed first.

    If lm90_alert_work() or lm90_report_alarms() runs in the window between
    the hwmon device being freed and the delayed works being cancelled,
    lm90_update_alarms() will dereference the freed data->hwmon_dev here.

    Fix the problem by canceling the workers separately after registering
    the hwmon device and before registering the interrupt handler. This ensures
    that the workers are canceled after interrupts are disabled and before
    the hwmon device is released. Add "shutdown" flag to indicate that device
    shutdown is in progress to prevent workers from being re-armed.

    Fixes: f6d0775119fb9 ("hwmon: (lm90) Rework alarm/status handling")
    Reported-by: Sashiko <sashiko-bot@kernel.org>
    Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 3c10a5066b53..c4a9dafff81d 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -736,6 +736,7 @@ struct lm90_data {
 	struct hwmon_chip_info chip;
 	struct delayed_work alert_work;
 	struct work_struct report_work;
+	bool shutdown;		/* true if shutting down */
 	bool valid;		/* true if register values are valid */
 	bool alarms_valid;	/* true if status register values are valid */
 	unsigned long last_updated; /* in jiffies */
@@ -1154,6 +1155,9 @@ static void lm90_report_alarms(struct work_struct *work)

 static int lm90_update_alarms_locked(struct lm90_data *data, bool force)
 {
+	if (data->shutdown)
+		return 0;
+
 	if (force || !data->alarms_valid ||
 	    time_after(jiffies, data->alarms_updated + msecs_to_jiffies(data->update_interval))) {
 		struct i2c_client *client = data->client;
@@ -2584,15 +2588,23 @@ static void lm90_restore_conf(void *_data)
 	struct lm90_data *data = _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)
 		lm90_write_convrate(data, data->convrate_orig);
 	lm90_write_reg(client, LM90_REG_CONFIG1, data->config_orig);
 }

+static void lm90_stop_work(void *_data)
+{
+	struct lm90_data *data = _data;
+
+	hwmon_lock(data->hwmon_dev);
+	data->shutdown = true;
+	hwmon_unlock(data->hwmon_dev);
+	cancel_delayed_work_sync(&data->alert_work);
+	cancel_work_sync(&data->report_work);
+}
+
 static int lm90_init_client(struct i2c_client *client, struct lm90_data *data)
 {
 	struct device_node *np = client->dev.of_node;
@@ -2902,6 +2914,10 @@ static int lm90_probe(struct i2c_client *client)

 	data->hwmon_dev = hwmon_dev;

+	err = devm_add_action_or_reset(&client->dev, lm90_stop_work, data);
+	if (err)
+		return err;
+
 	if (client->irq) {
 		dev_dbg(dev, "IRQ: %d\n", client->irq);
 		err = devm_request_threaded_irq(dev, client->irq,
@@ -2930,7 +2946,7 @@ static void lm90_alert(struct i2c_client *client, enum i2c_alert_protocol type,
 		 */
 		struct lm90_data *data = i2c_get_clientdata(client);

-		if ((data->flags & LM90_HAVE_BROKEN_ALERT) &&
+		if (!data->shutdown && (data->flags & LM90_HAVE_BROKEN_ALERT) &&
 		    (data->current_alarms & data->alert_alarms)) {
 			if (!(data->config & 0x80)) {
 				dev_dbg(&client->dev, "Disabling ALERT#\n");