[PATCH 23/23] x86, PCI: add pcibios_root_rescan

[Yinghai Lu <yinghai@kernel.org>]

need use it to rescan root bus that was not added via acpi probe.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 arch/x86/pci/legacy.c |   25 +++++++++++++++++++++++++
 1 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/arch/x86/pci/legacy.c b/arch/x86/pci/legacy.c
index aab0e41..7a7c78f 100644
--- a/arch/x86/pci/legacy.c
+++ b/arch/x86/pci/legacy.c
@@ -79,3 +79,28 @@ int __init pci_subsys_init(void)
 	return 0;
 }
 subsys_initcall(pci_subsys_init);
+
+void __devinit pcibios_root_rescan(void)
+{
+	int busn;
+	struct pci_bus *bus;
+
+	if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff)
+		return;
+
+	for (busn = 0; busn <= pcibios_last_bus; busn++) {
+		bus = pci_find_bus(0, busn);
+
+		if (bus)
+			continue;
+
+		bus = __pcibios_scan_specific_bus(busn, false);
+
+		if (!bus)
+			continue;
+
+		pci_assign_unassigned_bus_resources(bus);
+
+		pci_bus_add_devices(bus);
+	}
+}
-- 
1.7.7