+ if (flags & PCI_IRQ_MSIX) {
+ vecs = __pci_enable_msix_range(dev, NULL, min_vecs, max_vecs,
+ flags);
+ if (vecs > 0)
+ return vecs;
+ }
+
+ if (flags & PCI_IRQ_MSI) {
+ vecs = __pci_enable_msi_range(dev, min_vecs, max_vecs, flags);
+ if (vecs > 0)
+ return vecs;
+ }
+
+ /* use legacy irq if allowed */
+ if ((flags & PCI_IRQ_LEGACY) && min_vecs == 1)
+ return 1;
+ return vecs;
+}
+EXPORT_SYMBOL(pci_alloc_irq_vectors);
+
+/**
+ * pci_free_irq_vectors - free previously allocated IRQs for a device
+ * @dev: PCI device to operate on
+ *
+ * Undoes the allocations and enabling in pci_alloc_irq_vectors().
+ */
+void pci_free_irq_vectors(struct pci_dev *dev)
+{
+ pci_disable_msix(dev);
+ pci_disable_msi(dev);
+}
+EXPORT_SYMBOL(pci_free_irq_vectors);
+
+/**
+ * pci_irq_vector - return Linux IRQ number of a device vector
+ * @dev: PCI device to operate on
+ * @nr: device-relative interrupt vector index (0-based).
+ */
+int pci_irq_vector(struct pci_dev *dev, unsigned int nr)
+{
+ if (dev->msix_enabled) {
+ struct msi_desc *entry;
+ int i = 0;
+
+ for_each_pci_msi_entry(entry, dev) {
+ if (i == nr)
+ return entry->irq;
+ i++;