// SPDX-License-Identifier: GPL-2.0
#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/delay.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>

static acpi_handle test_handle;

static int acpi_wait_thread(void *data)
{
	acpi_status st;

	pr_info("ACPI_CASE5: waiter evaluating MWAI\n");
	st = acpi_evaluate_object(test_handle, "MWAI", NULL, NULL);
	pr_info("ACPI_CASE5: waiter returned st=%d\n", st);
	return 0;
}

static int __init acpi_case5_init(void)
{
	struct task_struct *t;
	acpi_status st;

	st = acpi_get_handle(NULL, "\\_SB.TST0", &test_handle);
	pr_info("ACPI_CASE5: get_handle st=%d handle=%px\n", st, test_handle);
	if (ACPI_FAILURE(st))
		return -ENODEV;

	t = kthread_run(acpi_wait_thread, NULL, "acpi_case5_wait");
	if (IS_ERR(t))
		return PTR_ERR(t);

	msleep(1000);
	pr_info("ACPI_CASE5: evaluating MRST while waiter blocked\n");
	st = acpi_evaluate_object(test_handle, "MRST", NULL, NULL);
	pr_info("ACPI_CASE5: MRST returned st=%d\n", st);
	msleep(1000);
	return 0;
}

static void __exit acpi_case5_exit(void)
{
	pr_info("ACPI_CASE5: unload\n");
}

module_init(acpi_case5_init);
module_exit(acpi_case5_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ACPI event Reset-vs-Wait race probe");