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authorAlexander Chiang <achiang@hp.com>2009-06-10 19:55:14 +0000
committerLen Brown <len.brown@intel.com>2009-06-17 23:22:15 -0400
commit275582031f9b3597a1b973f3ff617adfe639faa2 (patch)
tree7f4e2c43709758108042e5dcf9b89d756e5bf8e5 /drivers/acpi
parentce597bb42aa84bc73db80509b7c37e7fbc0b75c4 (diff)
ACPI: Introduce acpi_is_root_bridge()
Returns whether an ACPI CA node is a PCI root bridge or not. This API is generically useful, and shouldn't just be a hotplug function. The implementation becomes much simpler as well. Signed-off-by: Alex Chiang <achiang@hp.com> Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/pci_root.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index ca8dba3b40b9..888cb9f5c5fb 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -142,6 +142,30 @@ acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
+/**
+ * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
+ * @handle - the ACPI CA node in question.
+ *
+ * Note: we could make this API take a struct acpi_device * instead, but
+ * for now, it's more convenient to operate on an acpi_handle.
+ */
+int acpi_is_root_bridge(acpi_handle handle)
+{
+ int ret;
+ struct acpi_device *device;
+
+ ret = acpi_bus_get_device(handle, &device);
+ if (ret)
+ return 0;
+
+ ret = acpi_match_device_ids(device, root_device_ids);
+ if (ret)
+ return 0;
+ else
+ return 1;
+}
+EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
+
static acpi_status
get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
{