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PCI/ACPI: Use acpi_pci_root info rather than looking it up again

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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>
This commit is contained in:
Taku Izumi 2012-09-21 16:03:58 +09:00 committed by Bjorn Helgaas
parent 55bfe3c0c5
commit 0f2bdfedcb
1 changed files with 5 additions and 30 deletions
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35
drivers/acpi/pci_slot.c
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@ -233,45 +233,20 @@ walk_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
/*
* 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);