PCI: add generic pci_hp_add_bridge()

This creates a generic pci_hp_add_bridge() that can be used by several
hotplug drivers.

[bhelgaas: split out from pciehp patch]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

2 files changed, 24 insertions, 0 deletions

diff --git a/drivers/pci/hotplug-pci.c b/drivers/pci/hotplug-pci.c
index d3509cdeb554..44088c4fe687 100644
--- a/drivers/pci/hotplug-pci.c
+++ b/drivers/pci/hotplug-pci.c
@@ -4,6 +4,29 @@
 #include <linux/export.h>
 #include "pci.h"
 
+int __ref pci_hp_add_bridge(struct pci_dev *dev)
+{
+        struct pci_bus *parent = dev->bus;
+        int pass, busnr, start = parent->busn_res.start;
+        int end = parent->busn_res.end;
+
+        for (busnr = start; busnr <= end; busnr++) {
+                if (!pci_find_bus(pci_domain_nr(parent), busnr))
+                        break;
+        }
+        if (busnr-- > end) {
+                printk(KERN_ERR "No bus number available for hot-added bridge %s\n",
+                                pci_name(dev));
+                return -1;
+        }
+        for (pass = 0; pass < 2; pass++)
+                busnr = pci_scan_bridge(parent, dev, busnr, pass);
+        if (!dev->subordinate)
+                return -1;
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(pci_hp_add_bridge);
 
 unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus)
 {
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index e4943479b234..f3e14ce8eab7 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -124,6 +124,7 @@ static inline int pci_proc_detach_bus(struct pci_bus *bus) { return 0; }
 #endif
 
 /* Functions for PCI Hotplug drivers to use */
+int pci_hp_add_bridge(struct pci_dev *dev);
 extern unsigned int pci_do_scan_bus(struct pci_bus *bus);
 
 #ifdef HAVE_PCI_LEGACY