ACPI: optimize pci_rootbridge search
acpi_get_pci_rootbridge_handle() walks the ACPI name space searching for seg, bus and the PCI_ROOT_HID_STRING -- returning the handle as soon as if find the match. But the current codes always parses through the whole namespace because the user_function find_pci_rootbridge() returns status=AE_OK when it finds the match. Make the find_pci_rootbridge() return AE_CTRL_TERMINATE when it finds the match. This reduces the ACPI namespace walk for acpi_get_pci_rootbridge_handle(). Signed-off-by: Justin Chen <justin.chen@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>
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@ -189,8 +189,12 @@ find_pci_rootbridge(acpi_handle handle, u32 lvl, void *context, void **rv)
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bus = tmp;
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bus = tmp;
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if (seg == find->seg && bus == find->bus)
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if (seg == find->seg && bus == find->bus)
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{
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find->handle = handle;
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find->handle = handle;
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status = AE_OK;
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status = AE_CTRL_TERMINATE;
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}
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else
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status = AE_OK;
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exit:
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exit:
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kfree(buffer.pointer);
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kfree(buffer.pointer);
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return status;
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return status;
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