powerpc: Fix irq_alloc_host() reference counting and callers

When I changed irq_alloc_host() to take an of_node
(52964f87: "Add an optional
device_node pointer to the irq_host"), I botched the reference
counting semantics.

Stephen pointed out that it's irq_alloc_host()'s business if
it needs to take an additional reference to the device_node,
the caller shouldn't need to care.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/irq.c

@@ -498,7 +498,7 @@ struct irq_host *irq_alloc_host(struct device_node *of_node,
 	host->revmap_type = revmap_type;
 	host->inval_irq = inval_irq;
 	host->ops = ops;
-	host->of_node = of_node;
+	host->of_node = of_node_get(of_node);
 
 	if (host->ops->match == NULL)
 		host->ops->match = default_irq_host_match;

arch/powerpc/platforms/cell/axon_msi.c

@@ -365,7 +365,7 @@ static int axon_msi_probe(struct of_device *device,
 		goto out_free_fifo;
 	}
 
-	msic->irq_host = irq_alloc_host(of_node_get(dn), IRQ_HOST_MAP_NOMAP,
+	msic->irq_host = irq_alloc_host(dn, IRQ_HOST_MAP_NOMAP,
 					NR_IRQS, &msic_host_ops, 0);
 	if (!msic->irq_host) {
 		printk(KERN_ERR "axon_msi: couldn't allocate irq_host for %s\n",

arch/powerpc/platforms/cell/spider-pic.c

@@ -300,7 +300,7 @@ static void __init spider_init_one(struct device_node *of_node, int chip,
 		panic("spider_pic: can't map registers !");
 
 	/* Allocate a host */
-	pic->host = irq_alloc_host(of_node_get(of_node), IRQ_HOST_MAP_LINEAR,
+	pic->host = irq_alloc_host(of_node, IRQ_HOST_MAP_LINEAR,
 				   SPIDER_SRC_COUNT, &spider_host_ops,
 				   SPIDER_IRQ_INVALID);
 	if (pic->host == NULL)

arch/powerpc/sysdev/cpm1.c

@@ -159,7 +159,7 @@ unsigned int cpm_pic_init(void)
 
 	out_be32(&cpic_reg->cpic_cimr, 0);
 
-	cpm_pic_host = irq_alloc_host(of_node_get(np), IRQ_HOST_MAP_LINEAR,
+	cpm_pic_host = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR,
 				      64, &cpm_pic_host_ops, 64);
 	if (cpm_pic_host == NULL) {
 		printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n");

arch/powerpc/sysdev/cpm2_pic.c

@@ -266,7 +266,7 @@ void cpm2_pic_init(struct device_node *node)
 	out_be32(&cpm2_intctl->ic_scprrl, 0x05309770);
 
 	/* create a legacy host */
-	cpm2_pic_host = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LINEAR,
+	cpm2_pic_host = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
 				       64, &cpm2_pic_host_ops, 64);
 	if (cpm2_pic_host == NULL) {
 		printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n");

arch/powerpc/sysdev/i8259.c

@@ -276,7 +276,7 @@ void i8259_init(struct device_node *node, unsigned long intack_addr)
 	spin_unlock_irqrestore(&i8259_lock, flags);
 
 	/* create a legacy host */
-	i8259_host = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LEGACY,
+	i8259_host = irq_alloc_host(node, IRQ_HOST_MAP_LEGACY,
 				    0, &i8259_host_ops, 0);
 	if (i8259_host == NULL) {
 		printk(KERN_ERR "i8259: failed to allocate irq host !\n");

arch/powerpc/sysdev/ipic.c

@@ -735,13 +735,11 @@ struct ipic * __init ipic_init(struct device_node *node, unsigned int flags)
 
 	memset(ipic, 0, sizeof(struct ipic));
 
-	ipic->irqhost = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LINEAR,
+	ipic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
 				       NR_IPIC_INTS,
 				       &ipic_host_ops, 0);
-	if (ipic->irqhost == NULL) {
-		of_node_put(node);
+	if (ipic->irqhost == NULL)
 		return NULL;
-	}
 
 	ipic->regs = ioremap(res.start, res.end - res.start + 1);
 

arch/powerpc/sysdev/mpic.c

@@ -1016,13 +1016,11 @@ struct mpic * __init mpic_alloc(struct device_node *node,
 	memset(mpic, 0, sizeof(struct mpic));
 	mpic->name = name;
 
-	mpic->irqhost = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LINEAR,
+	mpic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
 				       isu_size, &mpic_host_ops,
 				       flags & MPIC_LARGE_VECTORS ? 2048 : 256);
-	if (mpic->irqhost == NULL) {
-		of_node_put(node);
+	if (mpic->irqhost == NULL)
 		return NULL;
-	}
 
 	mpic->irqhost->host_data = mpic;
 	mpic->hc_irq = mpic_irq_chip;

arch/powerpc/sysdev/qe_lib/qe_ic.c

@@ -339,12 +339,10 @@ void __init qe_ic_init(struct device_node *node, unsigned int flags,
 
 	memset(qe_ic, 0, sizeof(struct qe_ic));
 
-	qe_ic->irqhost = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LINEAR,
+	qe_ic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
 					NR_QE_IC_INTS, &qe_ic_host_ops, 0);
-	if (qe_ic->irqhost == NULL) {
-		of_node_put(node);
+	if (qe_ic->irqhost == NULL)
 		return;
-	}
 
 	qe_ic->regs = ioremap(res.start, res.end - res.start + 1);
 

arch/powerpc/sysdev/tsi108_pci.c

@@ -426,11 +426,10 @@ void __init tsi108_pci_int_init(struct device_node *node)
 {
 	DBG("Tsi108_pci_int_init: initializing PCI interrupts\n");
 
-	pci_irq_host = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LEGACY,
+	pci_irq_host = irq_alloc_host(node, IRQ_HOST_MAP_LEGACY,
 				      0, &pci_irq_host_ops, 0);
 	if (pci_irq_host == NULL) {
 		printk(KERN_ERR "pci_irq_host: failed to allocate irq host !\n");
-		of_node_put(node);
 		return;
 	}
 

arch/powerpc/sysdev/uic.c

@@ -280,12 +280,10 @@ static struct uic * __init uic_init_one(struct device_node *node)
 	}
 	uic->dcrbase = *dcrreg;
 
-	uic->irqhost = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LINEAR,
+	uic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
 				      NR_UIC_INTS, &uic_host_ops, -1);
-	if (! uic->irqhost) {
-		of_node_put(node);
+	if (! uic->irqhost)
 		return NULL; /* FIXME: panic? */
-	}
 
 	uic->irqhost->host_data = uic;