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>

1 files changed, 10 insertions, 6 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 7efe546a8c42..db5fc6f9628e 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -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();