diff options
| -rw-r--r-- | drivers/pci/bus.c | 48 | ||||
| -rw-r--r-- | include/linux/pci.h | 3 |
2 files changed, 51 insertions, 0 deletions
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c index a83ee0b85394..eed67d9e73bc 100644 --- a/drivers/pci/bus.c +++ b/drivers/pci/bus.c @@ -151,6 +151,54 @@ void pci_enable_bridges(struct pci_bus *bus) } } +/** 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); diff --git a/include/linux/pci.h b/include/linux/pci.h index 8878ccff9e3c..b0e244713281 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -434,6 +434,9 @@ const struct pci_device_id *pci_match_device(struct pci_driver *drv, struct pci_ const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, struct pci_dev *dev); int pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass); +void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *), + void *userdata); + /* kmem_cache style wrapper around pci_alloc_consistent() */ #include <linux/dmapool.h> |