PCI/MSI: Use msi_get_virq() in pci_get_vector()

Use msi_get_vector() and handle the return value to be compatible.

No functional change intended.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Tested-by: NMichael Kelley <mikelley@microsoft.com>
Tested-by: NNishanth Menon <nm@ti.com>
Reviewed-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: NJason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211210221814.841243231@linutronix.de

drivers/pci/msi/msi.c

@@ -1080,28 +1080,13 @@ EXPORT_SYMBOL(pci_free_irq_vectors);
  */
 int pci_irq_vector(struct pci_dev *dev, unsigned int nr)
 {
-	if (dev->msix_enabled) {
-		struct msi_desc *entry;
-
-		for_each_pci_msi_entry(entry, dev) {
-			if (entry->msi_index == nr)
-				return entry->irq;
-		}
-		WARN_ON_ONCE(1);
-		return -EINVAL;
-	}
+	unsigned int irq;
 
-	if (dev->msi_enabled) {
-		struct msi_desc *entry = first_pci_msi_entry(dev);
-
-		if (WARN_ON_ONCE(nr >= entry->nvec_used))
-			return -EINVAL;
-	} else {
-		if (WARN_ON_ONCE(nr > 0))
-			return -EINVAL;
-	}
+	if (!dev->msi_enabled && !dev->msix_enabled)
+		return !nr ? dev->irq : -EINVAL;
 
-	return dev->irq + nr;
+	irq = msi_get_virq(&dev->dev, nr);
+	return irq ? irq : -EINVAL;
 }
 EXPORT_SYMBOL(pci_irq_vector);