xen: events: return irq from xen_allocate_pirq_msi

consistent with other similar functions.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

arch/x86/pci/xen.c

@@ -100,8 +100,8 @@ static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 		pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) |
 			((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff);
 		if (xen_irq_from_pirq(pirq) >= 0 && msg.data == XEN_PIRQ_MSI_DATA) {
-			xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
-					"msi-x" : "msi", &irq, &pirq, 0);
+			irq = xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
+						    "msi-x" : "msi", &pirq, 0);
 			if (irq < 0)
 				goto error;
 			ret = set_irq_msi(irq, msidesc);
@@ -111,8 +111,8 @@ static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 					" pirq=%d\n", irq, pirq);
 			return 0;
 		}
-		xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
-				"msi-x" : "msi", &irq, &pirq, 1);
+		irq = xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
+					    "msi-x" : "msi", &pirq, 1);
 		if (irq < 0 || pirq < 0)
 			goto error;
 		printk(KERN_DEBUG "xen: msi --> irq=%d, pirq=%d\n", irq, pirq);
@@ -157,10 +157,10 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 		goto error;
 	i = 0;
 	list_for_each_entry(msidesc, &dev->msi_list, list) {
-		xen_allocate_pirq_msi(
+		irq = xen_allocate_pirq_msi(
 			(type == PCI_CAP_ID_MSIX) ?
 			"pcifront-msi-x" : "pcifront-msi",
-			&irq, &v[i], 0);
+			&v[i], 0);
 		if (irq < 0) {
 			ret = -1;
 			goto free;

drivers/xen/events.c

@@ -664,31 +664,34 @@ static int find_unbound_pirq(int type)
 	return -1;
 }
 
-void xen_allocate_pirq_msi(char *name, int *irq, int *pirq, int alloc_pirq)
+int xen_allocate_pirq_msi(char *name, int *pirq, int alloc_pirq)
 {
+	int irq;
+
 	spin_lock(&irq_mapping_update_lock);
 
-	*irq = xen_allocate_irq_dynamic();
-	if (*irq == -1)
+	irq = xen_allocate_irq_dynamic();
+	if (irq == -1)
 		goto out;
 
 	if (alloc_pirq) {
 		*pirq = find_unbound_pirq(MAP_PIRQ_TYPE_MSI);
 		if (*pirq == -1) {
-			xen_free_irq(*irq);
-			*irq = -1;
+			xen_free_irq(irq);
+			irq = -1;
 			goto out;
 		}
 	}
 
-	set_irq_chip_and_handler_name(*irq, &xen_pirq_chip,
+	set_irq_chip_and_handler_name(irq, &xen_pirq_chip,
 				      handle_level_irq, name);
 
-	irq_info[*irq] = mk_pirq_info(0, *pirq, 0, 0);
-	pirq_to_irq[*pirq] = *irq;
+	irq_info[irq] = mk_pirq_info(0, *pirq, 0, 0);
+	pirq_to_irq[*pirq] = irq;
 
 out:
 	spin_unlock(&irq_mapping_update_lock);
+	return irq;
 }
 
 int xen_create_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int type)

include/xen/events.h

@@ -75,7 +75,7 @@ int xen_allocate_pirq(unsigned gsi, int shareable, char *name);
 int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name);
 
 #ifdef CONFIG_PCI_MSI
-void xen_allocate_pirq_msi(char *name, int *irq, int *pirq, int alloc_pirq);
+int xen_allocate_pirq_msi(char *name, int *pirq, int alloc_pirq);
 int xen_create_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int type);
 #endif