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ACPI / scan: do not scan fixed hardware on HW-reduced platform 

Fixed hardware does not exist on HW-reduced ACPI platforms since the
programming interface for them is not implemented on them, so no need
to scan that hardware on them.

This patch avoids creating the fixed power button ACPI device and
eliminates a probe error message from ACPI button driver on ASUS T100.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Aaron Lu 2014-04-28 10:38:04 +08:00 committed by Rafael J. Wysocki
parent d1db0eea85
commit 2650ef4263
1 changed files with 10 additions and 6 deletions
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16
drivers/acpi/scan.c
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@ -2259,12 +2259,16 @@ int __init acpi_scan_init(void)
if (result)
goto out;
result = acpi_bus_scan_fixed();
if (result) {
acpi_detach_data(acpi_root->handle, acpi_scan_drop_device);
acpi_device_del(acpi_root);
put_device(&acpi_root->dev);
goto out;
/* Fixed feature devices do not exist on HW-reduced platform */
if (!acpi_gbl_reduced_hardware) {
result = acpi_bus_scan_fixed();
if (result) {
acpi_detach_data(acpi_root->handle,
acpi_scan_drop_device);
acpi_device_del(acpi_root);
put_device(&acpi_root->dev);
goto out;
}
}
acpi_update_all_gpes();