From 2650ef42636848db858625bd933131e8835f8d23 Mon Sep 17 00:00:00 2001 From: Aaron Lu Date: Mon, 28 Apr 2014 10:38:04 +0800 Subject: [PATCH] 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 Signed-off-by: Rafael J. Wysocki --- drivers/acpi/scan.c | 16 ++++++++++------ 1 file 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(); -- 2.39.2