[PATCH 2/7][RESEND] PCI: Correctly clean up pci root buses in function pci_remove_bus()

[Taku Izumi <izumi.taku@jp.fujitsu.com>]

From: Jiang Liu <jiang.liu@huawei.com>

    Correctly clean up pci root buses in function pci_remove_bus()
    
    The function pci_create_root_bus() allocates the pci bus structure,
    registers the bus device and creates the legacy files for a pci root
    bus, but returns without setting the is_added flag. The is_added flag
    for a pci root bus will be set by function pci_scan_child_bus().
    If a pci root bus is destroyed before calling pci_scan_child_bus(),
    the is_added flag will not be set.  So teach function pci_remove_bus()
    to detect such a case and correctly clean up pci root buses.
    
    Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
    Signed-off-by: Yinghai Lu <yinghai@kernel.org>
    Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
---
 drivers/pci/remove.c |    9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

Index: Bjorn-next-0808/drivers/pci/remove.c
===================================================================
--- Bjorn-next-0808.orig/drivers/pci/remove.c
+++ Bjorn-next-0808/drivers/pci/remove.c
@@ -70,11 +70,10 @@ void pci_remove_bus(struct pci_bus *pci_
 	list_del(&pci_bus->node);
 	pci_bus_release_busn_res(pci_bus);
 	up_write(&pci_bus_sem);
-	if (!pci_bus->is_added)
-		return;
-
-	pci_remove_legacy_files(pci_bus);
-	device_unregister(&pci_bus->dev);
+	if (pci_bus->is_added || pci_is_root_bus(pci_bus)) {
+		pci_remove_legacy_files(pci_bus);
+		device_unregister(&pci_bus->dev);
+	}
 }
 EXPORT_SYMBOL(pci_remove_bus);