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ACPI: probe ECDT before loading AML tables regardless of module-level code flag

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It was discovered that AML tables were loaded before or after the
ECDT depending on acpi_gbl_execute_tables_as_methods. According to
the ACPI spec, the ECDT should be loaded before the namespace is
populated by loading AML tables (DSDT and SSDT). Since the ECDT
should be loaded early in the boot process, this change moves the
ECDT probing to acpi_early_init.

Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Erik Schmauss 2018-10-17 15:41:21 -07:00 committed by Rafael J. Wysocki
parent 08930d56c7
commit d737f333b2
1 changed files with 16 additions and 28 deletions
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44
drivers/acpi/bus.c
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@ -1054,15 +1054,17 @@ void __init acpi_early_init(void)
goto error0;
}
if (!acpi_gbl_execute_tables_as_methods &&
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;
}
}
/*
* 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_load_tables() is called).
*
* This is accomplished by looking for the ECDT table, and getting
* the EC parameters out of that.
*
* Ignore the result. Not having an ECDT is not fatal.
*/
status = acpi_ec_ecdt_probe();
#ifdef CONFIG_X86
if (!acpi_ioapic) {
@ -1133,25 +1135,11 @@ static int __init acpi_bus_init(void)
acpi_os_initialize1();
/*
* 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_load_tables() is called).
*
* This is accomplished by looking for the ECDT table, and getting
* the EC parameters out of that.
*/
status = acpi_ec_ecdt_probe();
/* Ignore result. Not having an ECDT is not fatal. */
if (acpi_gbl_execute_tables_as_methods ||
!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_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);