+/**
+ * pci_dev_present - Returns 1 if device matching the device list is present, 0 if not.
+ * @ids: A pointer to a null terminated list of struct pci_device_id structures
+ * that describe the type of PCI device the caller is trying to find.
+ *
+ * Obvious fact: You do not have a reference to any device that might be found
+ * by this function, so if that device is removed from the system right after
+ * this function is finished, the value will be stale. Use this function to
+ * find devices that are usually built into a system, or for a general hint as
+ * to if another device happens to be present at this specific moment in time.
+ */
+int pci_dev_present(const struct pci_device_id *ids)
+{
+ struct pci_dev *dev;
+ int found = 0;
+
+ WARN_ON(in_interrupt());
+ spin_lock(&pci_bus_lock);
+ while (ids->vendor || ids->subvendor || ids->class_mask) {
+ list_for_each_entry(dev, &pci_devices, global_list) {
+ if (pci_match_one_device(ids, dev)) {
+ found = 1;
+ goto exit;
+ }
+ }
+ ids++;
+ }
+exit:
+ spin_unlock(&pci_bus_lock);
+ return found;
+}
+EXPORT_SYMBOL(pci_dev_present);
+