PCI/ACPI: Use acpi_pci_root info rather than looking it up again
This patch changes the function signature of walk_root_bridge().
We can omit _STA, _SEG, and _BBN evaluation by passing not acpi_handle
but acpi_pci_root. Now that acpi_pci_slot_add() which is the only
caller of walk_root_bridge() gets acpi_pci_root structure, changing
signature of walk_root_bridge() is reasonable.
[bhelgaas: changelog]
Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/drivers/acpi/pci_slot.c b/drivers/acpi/pci_slot.c
index 8051ffa..d22585f 100644
--- a/drivers/acpi/pci_slot.c
+++ b/drivers/acpi/pci_slot.c
@@ -233,45 +233,20 @@
/*
* walk_root_bridge - generic root bridge walker
- * @handle: points to an acpi_pci_root
+ * @root: poiner of an acpi_pci_root
* @user_function: user callback for slot objects
*
* Call user_function for all objects underneath this root bridge.
* Walk p2p bridges underneath us and call user_function on those too.
*/
static int
-walk_root_bridge(acpi_handle handle, acpi_walk_callback user_function)
+walk_root_bridge(struct acpi_pci_root *root, acpi_walk_callback user_function)
{
- int seg, bus;
- unsigned long long tmp;
acpi_status status;
- acpi_handle dummy_handle;
- struct pci_bus *pci_bus;
+ acpi_handle handle = root->device->handle;
+ struct pci_bus *pci_bus = root->bus;
struct callback_args context;
- /* If the bridge doesn't have _STA, we assume it is always there */
- status = acpi_get_handle(handle, "_STA", &dummy_handle);
- if (ACPI_SUCCESS(status)) {
- status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
- if (ACPI_FAILURE(status)) {
- info("%s: _STA evaluation failure\n", __func__);
- return 0;
- }
- if ((tmp & ACPI_STA_DEVICE_FUNCTIONING) == 0)
- /* don't register this object */
- return 0;
- }
-
- status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);
- seg = ACPI_SUCCESS(status) ? tmp : 0;
-
- status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);
- bus = ACPI_SUCCESS(status) ? tmp : 0;
-
- pci_bus = pci_find_bus(seg, bus);
- if (!pci_bus)
- return 0;
-
context.pci_bus = pci_bus;
context.user_function = user_function;
context.root_handle = handle;
@@ -299,7 +274,7 @@
{
acpi_status status;
- status = walk_root_bridge(root->device->handle, register_slot);
+ status = walk_root_bridge(root, register_slot);
if (ACPI_FAILURE(status))
err("%s: register_slot failure - %d\n", __func__, status);