Commit 0f2bdfed authored by Taku Izumi's avatar Taku Izumi Committed by Bjorn Helgaas
Browse files

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: default avatarTaku Izumi <izumi.taku@jp.fujitsu.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 55bfe3c0

drivers/acpi/pci_slot.c

+5 −30
Original line number Diff line number Diff line
@@ -233,45 +233,20 @@ out: 


/*

 * 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_pci_slot_add(struct acpi_pci_root *root) 
{

	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);

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