Fedora kernel-2.6.17-1.2142_FC4 patched with stable patch-2.6.17.4-vs2.0.2-rc26.diff

[linux-2.6.git] / drivers / pci / bus.c

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index dbd3360..eed67d9 100644 (file)
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -60,7 +60,9 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
                        continue;
 
                /* Ok, try it out.. */
-               ret = allocate_resource(r, res, size, min, -1, align,
+               ret = allocate_resource(r, res, size,
+                                       r->start ? : min,
+                                       -1, align,
                                        alignf, alignf_data);
                if (ret == 0)
                        break;
@@ -121,10 +123,13 @@ void __devinit pci_bus_add_devices(struct pci_bus *bus)
                 * If there is an unattached subordinate bus, attach
                 * it and then scan for unattached PCI devices.
                 */
-               if (dev->subordinate && list_empty(&dev->subordinate->node)) {
-                       spin_lock(&pci_bus_lock);
-                       list_add_tail(&dev->subordinate->node, &dev->bus->children);
-                       spin_unlock(&pci_bus_lock);
+               if (dev->subordinate) {
+                      if (list_empty(&dev->subordinate->node)) {
+                              spin_lock(&pci_bus_lock);
+                              list_add_tail(&dev->subordinate->node,
+                                              &dev->bus->children);
+                              spin_unlock(&pci_bus_lock);
+                      }
                        pci_bus_add_devices(dev->subordinate);
 
                        sysfs_create_link(&dev->subordinate->class_dev.kobj, &dev->dev.kobj, "bridge");
@@ -135,16 +140,65 @@ void __devinit pci_bus_add_devices(struct pci_bus *bus)
 void pci_enable_bridges(struct pci_bus *bus)
 {
        struct pci_dev *dev;
+       int retval;
 
        list_for_each_entry(dev, &bus->devices, bus_list) {
                if (dev->subordinate) {
-                       pci_enable_device(dev);
+                       retval = pci_enable_device(dev);
                        pci_set_master(dev);
                        pci_enable_bridges(dev->subordinate);
                }
        }
 }
 
+/** pci_walk_bus - walk devices on/under bus, calling callback.
+ *  @top      bus whose devices should be walked
+ *  @cb       callback to be called for each device found
+ *  @userdata arbitrary pointer to be passed to callback.
+ *
+ *  Walk the given bus, including any bridged devices
+ *  on buses under this bus.  Call the provided callback
+ *  on each device found.
+ */
+void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *),
+                 void *userdata)
+{
+       struct pci_dev *dev;
+       struct pci_bus *bus;
+       struct list_head *next;
+
+       bus = top;
+       spin_lock(&pci_bus_lock);
+       next = top->devices.next;
+       for (;;) {
+               if (next == &bus->devices) {
+                       /* end of this bus, go up or finish */
+                       if (bus == top)
+                               break;
+                       next = bus->self->bus_list.next;
+                       bus = bus->self->bus;
+                       continue;
+               }
+               dev = list_entry(next, struct pci_dev, bus_list);
+               pci_dev_get(dev);
+               if (dev->subordinate) {
+                       /* this is a pci-pci bridge, do its devices next */
+                       next = dev->subordinate->devices.next;
+                       bus = dev->subordinate;
+               } else
+                       next = dev->bus_list.next;
+               spin_unlock(&pci_bus_lock);
+
+               /* Run device routines with the bus unlocked */
+               cb(dev, userdata);
+
+               spin_lock(&pci_bus_lock);
+               pci_dev_put(dev);
+       }
+       spin_unlock(&pci_bus_lock);
+}
+EXPORT_SYMBOL_GPL(pci_walk_bus);
+
 EXPORT_SYMBOL(pci_bus_alloc_resource);
 EXPORT_SYMBOL_GPL(pci_bus_add_device);
 EXPORT_SYMBOL(pci_bus_add_devices);