PCI: Introduce pci_rescan_bus()

This API is used by the PCI core to rescan a bus and rediscover
newly added devices.

Over time, it is expected that the various PCI hotplug drivers
will migrate to this interface and away from the old
pci_do_scan_bus() interface.

Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

2 files changed, 35 insertions, 3 deletions

diff --git a/drivers/pci/hotplug/fakephp.c b/drivers/pci/hotplug/fakephp.c
index d8649e127298..16063745766e 100644
--- a/drivers/pci/hotplug/fakephp.c
+++ b/drivers/pci/hotplug/fakephp.c
@@ -245,12 +245,12 @@ static int pci_rescan_slot(struct pci_dev *temp)
 
 
 /**
- * pci_rescan_bus - Rescan PCI bus
+ * pci_rescan_bus_local - fakephp version of rescan PCI bus
  * @bus: the PCI bus to rescan
  *
  * Call pci_rescan_slot for each possible function of the bus.
  */
-static void pci_rescan_bus(const struct pci_bus *bus)
+static void pci_rescan_bus_local(const struct pci_bus *bus)
 {
         unsigned int devfn;
         struct pci_dev *dev;
@@ -291,7 +291,7 @@ static void pci_rescan_buses(const struct list_head *list)
         const struct list_head *l;
         list_for_each(l,list) {
                 const struct pci_bus *b = pci_bus_b(l);
-                pci_rescan_bus(b);
+                pci_rescan_bus_local(b);
                 pci_rescan_buses(&b->children);
         }
 }
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index f69256c63b2b..60a8e5fec6c5 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1212,6 +1212,38 @@ struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
 EXPORT_SYMBOL(pci_scan_bus_parented);
 
 #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 __devinit pci_rescan_bus(struct pci_bus *bus)
+{
+        unsigned int max;
+        struct pci_dev *dev;
+
+        max = pci_scan_child_bus(bus);
+
+        up_read(&pci_bus_sem);
+        list_for_each_entry(dev, &bus->devices, bus_list)
+                if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
+                    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
+                        if (dev->subordinate)
+                                pci_bus_size_bridges(dev->subordinate);
+        down_read(&pci_bus_sem);
+
+        pci_bus_assign_resources(bus);
+        pci_enable_bridges(bus);
+        pci_bus_add_devices(bus);
+
+        return max;
+}
+EXPORT_SYMBOL_GPL(pci_rescan_bus);
+
 EXPORT_SYMBOL(pci_add_new_bus);
 EXPORT_SYMBOL(pci_scan_slot);
 EXPORT_SYMBOL(pci_scan_bridge);