[PATCH v1] ACPI: battery: Fix system wakeup on critical battery status

["Rafael J. Wysocki" <rafael@kernel.org>]

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Commit 0a869409a981 ("ACPI: battery: Convert the driver to a platform
one") changed the parent of the battery wakeup source to the platform
device used for driver binding, but it forgot to update the
acpi_pm_wakeup_event() call in acpi_battery_update() accordingly.

Do it now to unbreak waking up the system on critical battery status
during suspend-to-idle and during transitions to ACPI S3/S4.

Fixes: 0a869409a981 ("ACPI: battery: Convert the driver to a platform one")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: 7.0+ <stable@vger.kernel.org> # 7.0+
---
 drivers/acpi/battery.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -94,6 +94,7 @@ struct acpi_battery {
 	struct power_supply *bat;
 	struct power_supply_desc bat_desc;
 	struct acpi_device *device;
+	struct device *phys_dev;
 	struct notifier_block pm_nb;
 	struct list_head list;
 	unsigned long update_time;
@@ -1033,7 +1034,7 @@ static int acpi_battery_update(struct ac
 	if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
 	    (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
 	     (battery->capacity_now <= battery->alarm)))
-		acpi_pm_wakeup_event(&battery->device->dev);
+		acpi_pm_wakeup_event(battery->phys_dev);
 
 	return result;
 }
@@ -1231,6 +1232,7 @@ static int acpi_battery_probe(struct pla
 
 	platform_set_drvdata(pdev, battery);
 
+	battery->phys_dev = &pdev->dev;
 	battery->device = device;
 
 	result = devm_mutex_init(&pdev->dev, &battery->update_lock);