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

PATCH New Aaron Lu 1 participant 1 message Apr 28, 2014 ACPI

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Aaron Lu

author

2014-04-28 02:37 UTC #0 lore raw

PATCH 1/1 ACPI / scan: do not scan fixed hardware on HW-reduced platform

Fixed hardware does not exist on HW-reduced ACPI platform since the programming interface for them is not implemented on those platforms, so no need to scan 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 <[email protected]>

---
 drivers/acpi/scan.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

drivers/acpi/scan.c +10 -6

index 7efe546a8c42..db5fc6f9628e 100644
@@ -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();

Signature · 1 line

1.9.0