diff options
Diffstat (limited to 'drivers/pci/setup-bus.c')
| -rw-r--r-- | drivers/pci/setup-bus.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 97c1eda96e64..c09c67ab5612 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1357,3 +1357,42 @@ enable_all: pci_enable_bridges(parent); } 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) +{ + unsigned int max; + struct pci_dev *dev; + struct resource_list_x add_list; /* list of resources that + want additional resources */ + + max = pci_scan_child_bus(bus); + + add_list.next = NULL; + down_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, + &add_list); + up_read(&pci_bus_sem); + __pci_bus_assign_resources(bus, &add_list, NULL); + BUG_ON(add_list.next); + + pci_enable_bridges(bus); + pci_bus_add_devices(bus); + + return max; +} +EXPORT_SYMBOL_GPL(pci_rescan_bus); +#endif |