PCI: Separate out pci_assign_unassigned_bus_resources()

It is main portion of pci_rescan_bus().

Separate it out and prepare to use it for PCI root bus hot add later.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 19 insertions, 14 deletions

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 1e808ca338f8..f64c071d6923 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1550,25 +1550,12 @@ enable_all:
 }
 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
 
-#ifdef CONFIG_HOTPLUG
-/**
- * pci_rescan_bus - scan a PCI bus for devices.
- * @bus: PCI bus to scan
- *
- * Scan a PCI bus and child buses for new devices, adds them,
- * and enables them.
- *
- * Returns the max number of subordinate bus discovered.
- */
-unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
+void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
 {
-        unsigned int max;
         struct pci_dev *dev;
         LIST_HEAD(add_list); /* list of resources that
                                         want additional resources */
 
-        max = pci_scan_child_bus(bus);
-
         down_read(&pci_bus_sem);
         list_for_each_entry(dev, &bus->devices, bus_list)
                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
@@ -1581,6 +1568,24 @@ unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
         BUG_ON(!list_empty(&add_list));
 
         pci_enable_bridges(bus);
+}
+
+#ifdef CONFIG_HOTPLUG
+/**
+ * pci_rescan_bus - scan a PCI bus for devices.
+ * @bus: PCI bus to scan
+ *
+ * Scan a PCI bus and child buses for new devices, adds them,
+ * and enables them.
+ *
+ * Returns the max number of subordinate bus discovered.
+ */
+unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
+{
+        unsigned int max;
+
+        max = pci_scan_child_bus(bus);
+        pci_assign_unassigned_bus_resources(bus);
         pci_bus_add_devices(bus);
 
         return max;