PCI: add pci_get_domain_bus_and_slot function

Added the pci_get_domain_and_slot_function which is analogous to
pci_get_bus_and_slot. It returns a pci_dev given a domain (segment) number,
bus number, and devnr. Like pci_get_bus_and_slot,
pci_get_domain_bus_and_slot holds a reference to the returned pci_dev.

Converted pci_get_bus_and_slot to a wrapper that calls
pci_get_domain_bus_and_slot with the domain hard-coded to 0.

This routine was patterned off code suggested by Bjorn Helgaas.

Acked-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Andrew Patterson <andrew.patterson@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 17 insertions, 17 deletions

diff --git a/drivers/pci/search.c b/drivers/pci/search.c
index ec415352d9ba..75826482c71a 100644
--- a/drivers/pci/search.c
+++ b/drivers/pci/search.c
@@ -149,32 +149,33 @@ struct pci_dev * pci_get_slot(struct pci_bus *bus, unsigned int devfn)
 }
 
 /**
- * pci_get_bus_and_slot - locate PCI device from a given PCI bus & slot
- * @bus: number of PCI bus on which desired PCI device resides
- * @devfn: encodes number of PCI slot in which the desired PCI
- * device resides and the logical device number within that slot
- * in case of multi-function devices.
- *
- * Note: the bus/slot search is limited to PCI domain (segment) 0.
+ * pci_get_domain_bus_and_slot - locate PCI device for a given PCI domain (segment), bus, and slot
+ * @domain: PCI domain/segment on which the PCI device resides.
+ * @bus: PCI bus on which desired PCI device resides
+ * @devfn: encodes number of PCI slot in which the desired PCI device
+ * resides and the logical device number within that slot in case of
+ * multi-function devices.
  *
- * Given a PCI bus and slot/function number, the desired PCI device
- * is located in system global list of PCI devices.  If the device
- * is found, a pointer to its data structure is returned.  If no
- * device is found, %NULL is returned. The returned device has its
- * reference count bumped by one.
+ * Given a PCI domain, bus, and slot/function number, the desired PCI
+ * device is located in the list of PCI devices. If the device is
+ * found, its reference count is increased and this function returns a
+ * pointer to its data structure.  The caller must decrement the
+ * reference count by calling pci_dev_put().  If no device is found,
+ * %NULL is returned.
  */
-
-struct pci_dev * pci_get_bus_and_slot(unsigned int bus, unsigned int devfn)
+struct pci_dev *pci_get_domain_bus_and_slot(int domain, unsigned int bus,
+                                            unsigned int devfn)
 {
         struct pci_dev *dev = NULL;
 
         while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
-                if (pci_domain_nr(dev->bus) == 0 &&
-                   (dev->bus->number == bus && dev->devfn == devfn))
+                if (pci_domain_nr(dev->bus) == domain &&
+                    (dev->bus->number == bus && dev->devfn == devfn))
                         return dev;
         }
         return NULL;
 }
+EXPORT_SYMBOL(pci_get_domain_bus_and_slot);
 
 static int match_pci_dev_by_id(struct device *dev, void *data)
 {
@@ -354,5 +355,4 @@ EXPORT_SYMBOL(pci_find_next_bus);
 EXPORT_SYMBOL(pci_get_device);
 EXPORT_SYMBOL(pci_get_subsys);
 EXPORT_SYMBOL(pci_get_slot);
-EXPORT_SYMBOL(pci_get_bus_and_slot);
 EXPORT_SYMBOL(pci_get_class);