xen: events: push set_irq_msi down into xen_create_msi_irq

Makes the tail end of this function look even more like
xen_bind_pirq_msi_to_irq.

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

arch/x86/pci/xen.c

@@ -185,23 +185,15 @@ static void xen_teardown_msi_irq(unsigned int irq)
 #ifdef CONFIG_XEN_DOM0
 static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
-	int irq, ret;
+	int irq;
 	struct msi_desc *msidesc;
 
 	list_for_each_entry(msidesc, &dev->msi_list, list) {
 		irq = xen_create_msi_irq(dev, msidesc, type);
 		if (irq < 0)
 			return -1;
-
-		ret = set_irq_msi(irq, msidesc);
-		if (ret)
-			goto error;
 	}
 	return 0;
-
-error:
-	xen_destroy_irq(irq);
-	return ret;
 }
 #endif
 #endif

drivers/xen/events.c

@@ -691,7 +691,7 @@ error_irq:
 
 int xen_create_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int type)
 {
-	int irq = -1;
+	int ret, irq = -1;
 	struct physdev_map_pirq map_irq;
 	int rc;
 	int pos;
@@ -736,9 +736,17 @@ int xen_create_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int type)
 			handle_level_irq,
 			(type == PCI_CAP_ID_MSIX) ? "msi-x":"msi");
 
+	ret = set_irq_msi(irq, msidesc);
+	if (ret)
+		goto out_irq;
+
 out:
 	spin_unlock(&irq_mapping_update_lock);
 	return irq;
+out_irq:
+	spin_unlock(&irq_mapping_update_lock);
+	xen_free_irq(irq);
+	return -1;
 }
 #endif