[POWERPC] 83xx: Return a point to the struct ipic from ipic_init()

It's useful to have access to struct ipic handle that just got created
in ipic_init().

For example, if we want to setup an external IRQ with out
a device node we need access ipic->irqhost to create the virtual to HW
IRQ mapping and to set the IRQ sense.  With this we can mimic the old
sense array concept that existed in arch/ppc.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/sysdev/ipic.c

@@ -557,8 +557,7 @@ static struct irq_host_ops ipic_host_ops = {
 	.xlate	= ipic_host_xlate,
 };
 
-void __init ipic_init(struct device_node *node,
-		unsigned int flags)
+struct ipic * __init ipic_init(struct device_node *node, unsigned int flags)
 {
 	struct ipic	*ipic;
 	struct resource res;
@@ -566,7 +565,7 @@ void __init ipic_init(struct device_node *node,
 
 	ipic = alloc_bootmem(sizeof(struct ipic));
 	if (ipic == NULL)
-		return;
+		return NULL;
 
 	memset(ipic, 0, sizeof(struct ipic));
 	ipic->of_node = of_node_get(node);
@@ -576,12 +575,14 @@ void __init ipic_init(struct device_node *node,
 				       &ipic_host_ops, 0);
 	if (ipic->irqhost == NULL) {
 		of_node_put(node);
-		return;
+		return NULL;
 	}
 
 	ret = of_address_to_resource(node, 0, &res);
-	if (ret)
-		return;
+	if (ret) {
+		of_node_put(node);
+		return NULL;
+	}
 
 	ipic->regs = ioremap(res.start, res.end - res.start + 1);
 
@@ -625,6 +626,8 @@ void __init ipic_init(struct device_node *node,
 
 	printk ("IPIC (%d IRQ sources) at %p\n", NR_IPIC_INTS,
 			primary_ipic->regs);
+
+	return ipic;
 }
 
 int ipic_set_priority(unsigned int virq, unsigned int priority)

include/asm-powerpc/ipic.h

@@ -78,7 +78,7 @@ extern u32 ipic_get_mcp_status(void);
 extern void ipic_clear_mcp_status(u32 mask);
 
 #ifdef CONFIG_PPC_MERGE
-extern void ipic_init(struct device_node *node, unsigned int flags);
+extern struct ipic * ipic_init(struct device_node *node, unsigned int flags);
 extern unsigned int ipic_get_irq(void);
 #else
 extern void ipic_init(phys_addr_t phys_addr, unsigned int flags,