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>

diff --git a/drivers/pci/hotplug/fakephp.c b/drivers/pci/hotplug/fakephp.c
index d8649e1..1606374 100644 (file)
--- 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 f69256c..60a8e5f 100644 (file)
--- 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);

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 50d9438..6fb335b 100644 (file)
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -726,6 +726,9 @@ int pci_back_from_sleep(struct pci_dev *dev);
 
 /* Functions for PCI Hotplug drivers to use */
 int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap);
+#ifdef CONFIG_HOTPLUG
+unsigned int pci_rescan_bus(struct pci_bus *bus);
+#endif
 
 /* Vital product data routines */
 ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf);