powerpc: Rework Axon MSI setup so we can avoid freeing the irq_host

If we do the call to irq_of_parse_and_map() first, then we don't
need to worry about freeing the irq_host.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/cell/axon_msi.c

@@ -358,6 +358,13 @@ static int axon_msi_probe(struct of_device *device,
 		goto out_free_msic;
 	}
 
+	virq = irq_of_parse_and_map(dn, 0);
+	if (virq == NO_IRQ) {
+		printk(KERN_ERR "axon_msi: irq parse and map failed for %s\n",
+		       dn->full_name);
+		goto out_free_fifo;
+	}
+
 	msic->irq_host = irq_alloc_host(of_node_get(dn), IRQ_HOST_MAP_NOMAP,
 					NR_IRQS, &msic_host_ops, 0);
 	if (!msic->irq_host) {
@@ -368,13 +375,6 @@ static int axon_msi_probe(struct of_device *device,
 
 	msic->irq_host->host_data = msic;
 
-	virq = irq_of_parse_and_map(dn, 0);
-	if (virq == NO_IRQ) {
-		printk(KERN_ERR "axon_msi: irq parse and map failed for %s\n",
-		       dn->full_name);
-		goto out_free_host;
-	}
-
 	set_irq_data(virq, msic);
 	set_irq_chained_handler(virq, axon_msi_cascade);
 	pr_debug("axon_msi: irq 0x%x setup for axon_msi\n", virq);
@@ -399,8 +399,6 @@ static int axon_msi_probe(struct of_device *device,
 
 	return 0;
 
-out_free_host:
-	kfree(msic->irq_host);
 out_free_fifo:
 	dma_free_coherent(&device->dev, MSIC_FIFO_SIZE_BYTES, msic->fifo_virt,
 			  msic->fifo_phys);