[PATCH] PCI: Small rearrangement of PCI probing code

This patch makes some small rearrangements of the PCI probing code in
order to make it possible for arch code to set up the PCI tree
without needing to duplicate code from the PCI layer unnecessarily.
PPC64 will use this to set up the PCI tree from the Open Firmware
device tree, which we need to do on logically-partitioned pSeries
systems.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 33 insertions, 17 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index b9c9b03919d4..35caec13023a 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -753,27 +753,19 @@ pci_scan_device(struct pci_bus *bus, int devfn)
                 kfree(dev);
                 return NULL;
         }
-        device_initialize(&dev->dev);
-        dev->dev.release = pci_release_dev;
-        pci_dev_get(dev);
-
-        dev->dev.dma_mask = &dev->dma_mask;
-        dev->dev.coherent_dma_mask = 0xffffffffull;
 
         return dev;
 }
 
-struct pci_dev * __devinit
-pci_scan_single_device(struct pci_bus *bus, int devfn)
+void __devinit pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
 {
-        struct pci_dev *dev;
+        device_initialize(&dev->dev);
+        dev->dev.release = pci_release_dev;
+        pci_dev_get(dev);
 
-        dev = pci_scan_device(bus, devfn);
-        pci_scan_msi_device(dev);
+        dev->dev.dma_mask = &dev->dma_mask;
+        dev->dev.coherent_dma_mask = 0xffffffffull;
 
-        if (!dev)
-                return NULL;
-        
         /* Fix up broken headers */
         pci_fixup_device(pci_fixup_header, dev);
 
@@ -785,6 +777,19 @@ pci_scan_single_device(struct pci_bus *bus, int devfn)
         spin_lock(&pci_bus_lock);
         list_add_tail(&dev->bus_list, &bus->devices);
         spin_unlock(&pci_bus_lock);
+}
+
+struct pci_dev * __devinit
+pci_scan_single_device(struct pci_bus *bus, int devfn)
+{
+        struct pci_dev *dev;
+
+        dev = pci_scan_device(bus, devfn);
+        if (!dev)
+                return NULL;
+
+        pci_device_add(dev, bus);
+        pci_scan_msi_device(dev);
 
         return dev;
 }
@@ -881,7 +886,8 @@ unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus)
         return max;
 }
 
-struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent, int bus, struct pci_ops *ops, void *sysdata)
+struct pci_bus * __devinit pci_create_bus(struct device *parent,
+                int bus, struct pci_ops *ops, void *sysdata)
 {
         int error;
         struct pci_bus *b;
@@ -938,8 +944,6 @@ struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent, int bus,
         b->resource[0] = &ioport_resource;
         b->resource[1] = &iomem_resource;
 
-        b->subordinate = pci_scan_child_bus(b);
-
         return b;
 
 sys_create_link_err:
@@ -957,6 +961,18 @@ err_out:
         kfree(b);
         return NULL;
 }
+EXPORT_SYMBOL_GPL(pci_create_bus);
+
+struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
+                int bus, struct pci_ops *ops, void *sysdata)
+{
+        struct pci_bus *b;
+
+        b = pci_create_bus(parent, bus, ops, sysdata);
+        if (b)
+                b->subordinate = pci_scan_child_bus(b);
+        return b;
+}
 EXPORT_SYMBOL(pci_scan_bus_parented);
 
 #ifdef CONFIG_HOTPLUG