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Commit fe6cbea0 authored by Lv Zheng's avatar Lv Zheng Committed by Rafael J. Wysocki
Browse files

ACPI 2.0 / ECDT: Enable correct ECDT initialization order 

With wrong ECDT fixes reverted, it is possible to put ECDT probing before
acpi_enable_subsystem().

But the ultimate purpose of ECDT re-enabling is to put the ECDT probing
before the namespace initialization (acpi_load_tables()). This patch
achieves this with protections so that we can enable it later when all
necessary corrections are upstreamed.

Link 4: https://bugzilla.kernel.org/show_bug.cgi?id=112911


Signed-off-by: default avatarLv Zheng <lv.zheng@intel.com>
Tested-by: default avatarChris Bainbridge <chris.bainbridge@gmail.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 59f0aa94

drivers/acpi/bus.c

+25 −14
Original line number Diff line number Diff line
@@ -925,12 +925,14 @@ void __init acpi_early_init(void) 
		goto error0;

	}



	if (acpi_gbl_group_module_level_code) {

		status = acpi_load_tables();

		if (ACPI_FAILURE(status)) {

			printk(KERN_ERR PREFIX

			       "Unable to load the System Description Tables\n");

			goto error0;

		}

	}



#ifdef CONFIG_X86

	if (!acpi_ioapic) {
@@ -995,17 +997,10 @@ static int __init acpi_bus_init(void) 


	acpi_os_initialize1();



	status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);

	if (ACPI_FAILURE(status)) {

		printk(KERN_ERR PREFIX

		       "Unable to start the ACPI Interpreter\n");

		goto error1;

	}



	/*

	 * ACPI 2.0 requires the EC driver to be loaded and work before

	 * the EC device is found in the namespace (i.e. before acpi_initialize_objects()

	 * is called).

	 * the EC device is found in the namespace (i.e. before

	 * acpi_load_tables() is called).

	 *

	 * This is accomplished by looking for the ECDT table, and getting

	 * the EC parameters out of that.
@@ -1013,6 +1008,22 @@ static int __init acpi_bus_init(void) 
	status = acpi_ec_ecdt_probe();

	/* Ignore result. Not having an ECDT is not fatal. */



	if (!acpi_gbl_group_module_level_code) {

		status = acpi_load_tables();

		if (ACPI_FAILURE(status)) {

			printk(KERN_ERR PREFIX

			       "Unable to load the System Description Tables\n");

			goto error1;

		}

	}



	status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);

	if (ACPI_FAILURE(status)) {

		printk(KERN_ERR PREFIX

		       "Unable to start the ACPI Interpreter\n");

		goto error1;

	}



	status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);

	if (ACPI_FAILURE(status)) {

		printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");