[POWERPC] Add an optional device_node pointer to the irq_host

The majority of irq_host implementations (3 out of 4) are associated
with a device_node, and need to stash it somewhere. Rather than having
it somewhere different for each host, add an optional device_node pointer
to the irq_host structure.

Signed-off-by: Michael Ellerman <[e-mail]>
Signed-off-by: Paul Mackerras <[e-mail]>

arch/powerpc/kernel/irq.c

···
 }
 EXPORT_SYMBOL_GPL(virq_to_hw);
 
-__init_refok struct irq_host *irq_alloc_host(unsigned int revmap_type,
-						unsigned int revmap_arg,
-						struct irq_host_ops *ops,
-						irq_hw_number_t inval_irq)
+__init_refok struct irq_host *irq_alloc_host(struct device_node *of_node,
+				unsigned int revmap_type,
+				unsigned int revmap_arg,
+				struct irq_host_ops *ops,
+				irq_hw_number_t inval_irq)
 {
 	struct irq_host *host;
 	unsigned int size = sizeof(struct irq_host);
···
 	host->revmap_type = revmap_type;
 	host->inval_irq = inval_irq;
 	host->ops = ops;
+	host->of_node = of_node;
 
 	spin_lock_irqsave(&irq_big_lock, flags);
 

arch/powerpc/platforms/52xx/mpc52xx_pic.c

···
 static int mpc52xx_irqhost_match(struct irq_host *h, struct device_node *node)
 {
 	pr_debug("%s: node=%p\n", __func__, node);
-	return mpc52xx_irqhost->host_data == node;
+	return h->of_node == node;
 }
 
 static int mpc52xx_irqhost_xlate(struct irq_host *h, struct device_node *ct,
···
 	 * hw irq information provided by the ofw to linux virq
 	 */
 
-	mpc52xx_irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR,
+	mpc52xx_irqhost = irq_alloc_host(picnode, IRQ_HOST_MAP_LINEAR,
 	                                 MPC52xx_IRQ_HIGHTESTHWIRQ,
 	                                 &mpc52xx_irqhost_ops, -1);
 
 	if (!mpc52xx_irqhost)
 		panic(__FILE__ ": Cannot allocate the IRQ host\n");
 
-	mpc52xx_irqhost->host_data = picnode;
 	printk(KERN_INFO "MPC52xx PIC is up and running!\n");
 }
 

arch/powerpc/platforms/82xx/mpc82xx_ads.c

···
 
 static unsigned long pci_int_base;
 static struct irq_host *pci_pic_host;
-static struct device_node *pci_pic_node;
 #endif
 
 static void __init mpc82xx_ads_pic_init(void)
···
 
 static int pci_pic_host_match(struct irq_host *h, struct device_node *node)
 {
-	return node == pci_pic_node;
+	return h->of_node == node;
 }
 
 static int pci_pic_host_map(struct irq_host *h, unsigned int virq,
···
 		iounmap(immap);
 		return;
 	}
-	pci_pic_node = of_node_get(np);
 	/* PCI interrupt controller registers: status and mask */
 	regs = of_get_property(np, "reg", &size);
 	if ((!regs) || (size <= 2)) {
···
 	    ioremap(regs[0], sizeof(*pci_regs.pci_int_stat_reg));
 	pci_regs.pci_int_mask_reg =
 	    ioremap(regs[1], sizeof(*pci_regs.pci_int_mask_reg));
-	of_node_put(np);
 	/* configure chip select for PCI interrupt controller */
 	immap->im_memctl.memc_br3 = regs[0] | 0x00001801;
 	immap->im_memctl.memc_or3 = 0xffff8010;
···
 	*pci_regs.pci_int_mask_reg |= 0xfff00000;
 	iounmap(immap);
 	pci_pic_host =
-	    irq_alloc_host(IRQ_HOST_MAP_LINEAR, irq_max - irq_min + 1,
+	    irq_alloc_host(np, IRQ_HOST_MAP_LINEAR, irq_max - irq_min + 1,
 			   &pci_pic_host_ops, irq_max + 1);
 	return;
 }

arch/powerpc/platforms/cell/axon_msi.c

···
 
 
 struct axon_msic {
-	struct device_node *dn;
 	struct irq_host *irq_host;
 	__le32 *fifo;
 	dcr_host_t dcr_host;
···
 
 static int msic_host_match(struct irq_host *host, struct device_node *dn)
 {
-	struct axon_msic *msic = host->host_data;
-
-	return msic->dn == dn;
+	return host->of_node == dn;
 }
 
 static struct irq_host_ops msic_host_ops = {
···
 	u32 tmp;
 
 	list_for_each_entry(msic, &axon_msic_list, list) {
-		pr_debug("axon_msi: disabling %s\n", msic->dn->full_name);
+		pr_debug("axon_msi: disabling %s\n",
+			  msic->irq_host->of_node->full_name);
 		tmp  = msic_dcr_read(msic, MSIC_CTRL_REG);
 		tmp &= ~MSIC_CTRL_ENABLE & ~MSIC_CTRL_IRQ_ENABLE;
 		msic_dcr_write(msic, MSIC_CTRL_REG, tmp);
···
 
 	msic->fifo = page_address(page);
 
-	msic->irq_host = irq_alloc_host(IRQ_HOST_MAP_NOMAP, NR_IRQS,
-					&msic_host_ops, 0);
+	msic->irq_host = irq_alloc_host(of_node_get(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",
 		       dn->full_name);
···
 		       dn->full_name);
 		goto out_free_host;
 	}
-
-	msic->dn = of_node_get(dn);
 
 	set_irq_data(virq, msic);
 	set_irq_chained_handler(virq, axon_msi_cascade);

arch/powerpc/platforms/cell/interrupt.c

···
 void __init iic_init_IRQ(void)
 {
 	/* Setup an irq host data structure */
-	iic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, IIC_SOURCE_COUNT,
+	iic_host = irq_alloc_host(NULL, IRQ_HOST_MAP_LINEAR, IIC_SOURCE_COUNT,
 				  &iic_host_ops, IIC_IRQ_INVALID);
 	BUG_ON(iic_host == NULL);
 	irq_set_default_host(iic_host);

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

···
 
 struct spider_pic {
 	struct irq_host		*host;
-	struct device_node	*of_node;
 	void __iomem		*regs;
 	unsigned int		node_id;
 };
···
 
 static int spider_host_match(struct irq_host *h, struct device_node *node)
 {
-	struct spider_pic *pic = h->host_data;
-	return node == pic->of_node;
+	return h->of_node == node;
 }
 
 static int spider_host_map(struct irq_host *h, unsigned int virq,
···
 	 * tree in case the device-tree is ever fixed
 	 */
 	struct of_irq oirq;
-	if (of_irq_map_one(pic->of_node, 0, &oirq) == 0) {
+	if (of_irq_map_one(pic->host->of_node, 0, &oirq) == 0) {
 		virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
 					     oirq.size);
 		return virq;
 	}
 
 	/* Now do the horrible hacks */
-	tmp = of_get_property(pic->of_node, "#interrupt-cells", NULL);
+	tmp = of_get_property(pic->host->of_node, "#interrupt-cells", NULL);
 	if (tmp == NULL)
 		return NO_IRQ;
 	intsize = *tmp;
-	imap = of_get_property(pic->of_node, "interrupt-map", &imaplen);
+	imap = of_get_property(pic->host->of_node, "interrupt-map", &imaplen);
 	if (imap == NULL || imaplen < (intsize + 1))
 		return NO_IRQ;
 	iic = of_find_node_by_phandle(imap[intsize]);
···
 		panic("spider_pic: can't map registers !");
 
 	/* Allocate a host */
-	pic->host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, SPIDER_SRC_COUNT,
-				   &spider_host_ops, SPIDER_IRQ_INVALID);
+	pic->host = irq_alloc_host(of_node_get(of_node), IRQ_HOST_MAP_LINEAR,
+				   SPIDER_SRC_COUNT, &spider_host_ops,
+				   SPIDER_IRQ_INVALID);
 	if (pic->host == NULL)
 		panic("spider_pic: can't allocate irq host !");
 	pic->host->host_data = pic;
-
-	/* Fill out other bits */
-	pic->of_node = of_node_get(of_node);
 
 	/* Go through all sources and disable them */
 	for (i = 0; i < SPIDER_SRC_COUNT; i++) {

arch/powerpc/platforms/celleb/interrupt.c

···
 	ppc_md.get_irq = beatic_get_irq;
 
 	/* Allocate an irq host */
-	beatic_host = irq_alloc_host(IRQ_HOST_MAP_NOMAP, 0,
+	beatic_host = irq_alloc_host(NULL, IRQ_HOST_MAP_NOMAP, 0,
 					 &beatic_pic_host_ops,
 					 0);
 	BUG_ON(beatic_host == NULL);

arch/powerpc/platforms/iseries/irq.c

···
 	/* Create irq host. No need for a revmap since HV will give us
 	 * back our virtual irq number
 	 */
-	host = irq_alloc_host(IRQ_HOST_MAP_NOMAP, 0, &iseries_irq_host_ops, 0);
+	host = irq_alloc_host(NULL, IRQ_HOST_MAP_NOMAP, 0,
+			      &iseries_irq_host_ops, 0);
 	BUG_ON(host == NULL);
 	irq_set_default_host(host);
 

arch/powerpc/platforms/powermac/pic.c

···
 	/*
 	 * Allocate an irq host
 	 */
-	pmac_pic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, max_irqs,
+	pmac_pic_host = irq_alloc_host(master, IRQ_HOST_MAP_LINEAR, max_irqs,
 				       &pmac_pic_host_ops,
 				       max_irqs);
 	BUG_ON(pmac_pic_host == NULL);

arch/powerpc/platforms/ps3/interrupt.c

···
 	unsigned cpu;
 	struct irq_host *host;
 
-	host = irq_alloc_host(IRQ_HOST_MAP_NOMAP, 0, &ps3_host_ops,
+	host = irq_alloc_host(NULL, IRQ_HOST_MAP_NOMAP, 0, &ps3_host_ops,
 		PS3_INVALID_OUTLET);
 	irq_set_default_host(host);
 	irq_set_virq_count(PS3_PLUG_MAX + 1);

arch/powerpc/platforms/pseries/xics.c

···
 		ops = &xics_host_lpar_ops;
 	else
 		ops = &xics_host_direct_ops;
-	xics_host = irq_alloc_host(IRQ_HOST_MAP_TREE, 0, ops,
+	xics_host = irq_alloc_host(NULL, IRQ_HOST_MAP_TREE, 0, ops,
 				   XICS_IRQ_SPURIOUS);
 	BUG_ON(xics_host == NULL);
 	irq_set_default_host(xics_host);

arch/powerpc/sysdev/commproc.c

···
 cpm8xx_t *cpmp;          /* Pointer to comm processor space */
 cpic8xx_t *cpic_reg;
 
-static struct device_node *cpm_pic_node;
 static struct irq_host *cpm_pic_host;
 
 static void cpm_mask_irq(unsigned int irq)
···
 
 static int cpm_pic_host_match(struct irq_host *h, struct device_node *node)
 {
-	return cpm_pic_node == node;
+	return h->of_node == node;
 }
 
 static int cpm_pic_host_map(struct irq_host *h, unsigned int virq,
···
 
 	out_be32(&cpic_reg->cpic_cimr, 0);
 
-	cpm_pic_node = of_node_get(np);
-
-	cpm_pic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 64, &cpm_pic_host_ops, 64);
+	cpm_pic_host = irq_alloc_host(of_node_get(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");
 		sirq = NO_IRQ;

arch/powerpc/sysdev/cpm2_pic.c

···
 
 static intctl_cpm2_t *cpm2_intctl;
 
-static struct device_node *cpm2_pic_node;
 static struct irq_host *cpm2_pic_host;
 #define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
 static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
···
 
 static int cpm2_pic_host_match(struct irq_host *h, struct device_node *node)
 {
-	return cpm2_pic_node == node;
+	return h->of_node == node;
 }
 
 static int cpm2_pic_host_map(struct irq_host *h, unsigned int virq,
···
 	out_be32(&cpm2_intctl->ic_scprrl, 0x05309770);
 
 	/* create a legacy host */
-	cpm2_pic_node = of_node_get(node);
-	cpm2_pic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 64, &cpm2_pic_host_ops, 64);
+	cpm2_pic_host = irq_alloc_host(of_node_get(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");
 		return;

arch/powerpc/sysdev/i8259.c

···
 
 static DEFINE_SPINLOCK(i8259_lock);
 
-static struct device_node *i8259_node;
 static struct irq_host *i8259_host;
 
 /*
···
 
 static int i8259_host_match(struct irq_host *h, struct device_node *node)
 {
-	return i8259_node == NULL || i8259_node == node;
+	return h->of_node == NULL || h->of_node == node;
 }
 
 static int i8259_host_map(struct irq_host *h, unsigned int virq,
···
 	spin_unlock_irqrestore(&i8259_lock, flags);
 
 	/* create a legacy host */
-	if (node)
-		i8259_node = of_node_get(node);
-	i8259_host = irq_alloc_host(IRQ_HOST_MAP_LEGACY, 0, &i8259_host_ops, 0);
+	i8259_host = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LEGACY,
+				    0, &i8259_host_ops, 0);
 	if (i8259_host == NULL) {
 		printk(KERN_ERR "i8259: failed to allocate irq host !\n");
 		return;

arch/powerpc/sysdev/ipic.c

···
 
 static int ipic_host_match(struct irq_host *h, struct device_node *node)
 {
-	struct ipic *ipic = h->host_data;
-
 	/* Exact match, unless ipic node is NULL */
-	return ipic->of_node == NULL || ipic->of_node == node;
+	return h->of_node == NULL || h->of_node == node;
 }
 
 static int ipic_host_map(struct irq_host *h, unsigned int virq,
···
 		return NULL;
 
 	memset(ipic, 0, sizeof(struct ipic));
-	ipic->of_node = of_node_get(node);
 
-	ipic->irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR,
+	ipic->irqhost = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LINEAR,
 				       NR_IPIC_INTS,
 				       &ipic_host_ops, 0);
 	if (ipic->irqhost == NULL) {

arch/powerpc/sysdev/ipic.h

···
 
 	/* The "linux" controller struct */
 	struct irq_chip		hc_irq;
-
-	/* The device node of the interrupt controller */
-	struct device_node	*of_node;
 };
 
 struct ipic_info {

arch/powerpc/sysdev/mpc8xx_pic.c

···
 
 extern int cpm_get_irq(struct pt_regs *regs);
 
-static struct device_node *mpc8xx_pic_node;
 static struct irq_host *mpc8xx_pic_host;
 #define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
 static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
···
 
 static int mpc8xx_pic_host_match(struct irq_host *h, struct device_node *node)
 {
-	return mpc8xx_pic_node == node;
+	return h->of_node == node;
 }
 
 static int mpc8xx_pic_host_map(struct irq_host *h, unsigned int virq,
···
 		return -ENOMEM;
 	}
 
-	mpc8xx_pic_node = of_node_get(np);
-
 	ret = of_address_to_resource(np, 0, &res);
-	of_node_put(np);
 	if (ret)
-		return ret;
+		goto out;
 
 	siu_reg = (void *)ioremap(res.start, res.end - res.start + 1);
-	if (siu_reg == NULL)
-		return -EINVAL;
+	if (siu_reg == NULL) {
+		ret = -EINVAL;
+		goto out;
+	}
 
-	mpc8xx_pic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 64, &mpc8xx_pic_host_ops, 64);
+	mpc8xx_pic_host = irq_alloc_host(of_node_get(np), IRQ_HOST_MAP_LINEAR,
+					 64, &mpc8xx_pic_host_ops, 64);
 	if (mpc8xx_pic_host == NULL) {
 		printk(KERN_ERR "MPC8xx PIC: failed to allocate irq host!\n");
 		ret = -ENOMEM;
 	}
 
+out:
+	of_node_put(np);
 	return ret;
 }

arch/powerpc/sysdev/mpic.c

···
 {
 	rb->dbase = mpic->dcr_base;
 	rb->doff = offset;
-	rb->dhost = dcr_map(mpic->of_node, rb->dbase + rb->doff, size);
+	rb->dhost = dcr_map(mpic->irqhost->of_node, rb->dbase + rb->doff, size);
 	BUG_ON(!DCR_MAP_OK(rb->dhost));
 }
 
···
 
 static int mpic_host_match(struct irq_host *h, struct device_node *node)
 {
-	struct mpic *mpic = h->host_data;
-
 	/* Exact match, unless mpic node is NULL */
-	return mpic->of_node == NULL || mpic->of_node == node;
+	return h->of_node == NULL || h->of_node == node;
 }
 
 static int mpic_host_map(struct irq_host *h, unsigned int virq,
···
 	
 	memset(mpic, 0, sizeof(struct mpic));
 	mpic->name = name;
-	mpic->of_node = of_node_get(node);
 
-	mpic->irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR, isu_size,
-				       &mpic_host_ops,
+	mpic->irqhost = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LINEAR,
+				       isu_size, &mpic_host_ops,
 				       flags & MPIC_LARGE_VECTORS ? 2048 : 256);
 	if (mpic->irqhost == NULL) {
 		of_node_put(node);

arch/powerpc/sysdev/mpic_msi.c

···
 	int i, len;
 	const u32 *p;
 
-	p = of_get_property(mpic->of_node, "msi-available-ranges", &len);
+	p = of_get_property(mpic->irqhost->of_node,
+			    "msi-available-ranges", &len);
 	if (!p) {
 		pr_debug("mpic: no msi-available-ranges property found on %s\n",
-			  mpic->of_node->full_name);
+			  mpic->irqhost->of_node->full_name);
 		return -ENODEV;
 	}
 
 	if (len % 8 != 0) {
 		printk(KERN_WARNING "mpic: Malformed msi-available-ranges "
-		       "property on %s\n", mpic->of_node->full_name);
+		       "property on %s\n", mpic->irqhost->of_node->full_name);
 		return -EINVAL;
 	}
 

arch/powerpc/sysdev/mv64x60_pic.c

···
 
 static int mv64x60_host_match(struct irq_host *h, struct device_node *np)
 {
-	return mv64x60_irq_host->host_data == np;
+	return h->of_node == np;
 }
 
 static struct irq_chip *mv64x60_chips[] = {
···
 	np = of_find_compatible_node(NULL, NULL, "marvell,mv64x60-pic");
 	reg = of_get_property(np, "reg", &size);
 	paddr = of_translate_address(np, reg);
-	of_node_put(np);
 	mv64x60_irq_reg_base = ioremap(paddr, reg[1]);
 
-	mv64x60_irq_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, MV64x60_NUM_IRQS,
+	mv64x60_irq_host = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR,
+					  MV64x60_NUM_IRQS,
 					  &mv64x60_host_ops, MV64x60_NUM_IRQS);
-
-	mv64x60_irq_host->host_data = np;
 
 	spin_lock_irqsave(&mv64x60_lock, flags);
 	out_le32(mv64x60_gpp_reg_base + MV64x60_GPP_INTR_MASK,

arch/powerpc/sysdev/qe_lib/qe_ic.c

···
 
 static int qe_ic_host_match(struct irq_host *h, struct device_node *node)
 {
-	struct qe_ic *qe_ic = h->host_data;
-
 	/* Exact match, unless qe_ic node is NULL */
-	return qe_ic->of_node == NULL || qe_ic->of_node == node;
+	return h->of_node == NULL || h->of_node == node;
 }
 
 static int qe_ic_host_map(struct irq_host *h, unsigned int virq,
···
 		return;
 
 	memset(qe_ic, 0, sizeof(struct qe_ic));
-	qe_ic->of_node = of_node_get(node);
 
-	qe_ic->irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR,
+	qe_ic->irqhost = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LINEAR,
 					NR_QE_IC_INTS, &qe_ic_host_ops, 0);
 	if (qe_ic->irqhost == NULL) {
 		of_node_put(node);

arch/powerpc/sysdev/qe_lib/qe_ic.h

···
 	/* The "linux" controller struct */
 	struct irq_chip hc_irq;
 
-	/* The device node of the interrupt controller */
-	struct device_node *of_node;
-
 	/* VIRQ numbers of QE high/low irqs */
 	unsigned int virq_high;
 	unsigned int virq_low;

arch/powerpc/sysdev/tsi108_pci.c

···
 u32 tsi108_pci_cfg_base;
 static u32 tsi108_pci_cfg_phys;
 u32 tsi108_csr_vir_base;
-static struct device_node *pci_irq_node;
 static struct irq_host *pci_irq_host;
 
 extern u32 get_vir_csrbase(void);
···
 
 static int pci_irq_host_match(struct irq_host *h, struct device_node *node)
 {
-	return pci_irq_node == node;
+	return h->of_node == node;
 }
 
 static struct irq_host_ops pci_irq_host_ops = {
···
 {
 	DBG("Tsi108_pci_int_init: initializing PCI interrupts\n");
 
-	pci_irq_node = of_node_get(node);
-	pci_irq_host = irq_alloc_host(IRQ_HOST_MAP_LEGACY, 0, &pci_irq_host_ops, 0);
+	pci_irq_host = irq_alloc_host(of_node_get(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

···
 
 	/* For secondary UICs, the cascade interrupt's irqaction */
 	struct irqaction cascade;
-
-	/* The device node of the interrupt controller */
-	struct device_node *of_node;
 };
 
 static void uic_unmask_irq(unsigned int virq)
···
 
 static int uic_host_match(struct irq_host *h, struct device_node *node)
 {
-	struct uic *uic = h->host_data;
-	return uic->of_node == node;
+	return h->of_node == node;
 }
 
 static int uic_host_map(struct irq_host *h, unsigned int virq,
···
 
 	memset(uic, 0, sizeof(*uic));
 	spin_lock_init(&uic->lock);
-	uic->of_node = of_node_get(node);
 	indexp = of_get_property(node, "cell-index", &len);
 	if (!indexp || (len != sizeof(u32))) {
 		printk(KERN_ERR "uic: Device node %s has missing or invalid "
···
 	}
 	uic->dcrbase = *dcrreg;
 
-	uic->irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR, NR_UIC_INTS,
-				      &uic_host_ops, -1);
+	uic->irqhost = irq_alloc_host(of_node_get(node), IRQ_HOST_MAP_LINEAR,
+				      NR_UIC_INTS, &uic_host_ops, -1);
 	if (! uic->irqhost) {
 		of_node_put(node);
 		return NULL; /* FIXME: panic? */

include/asm-powerpc/irq.h

···
 	struct irq_host_ops	*ops;
 	void			*host_data;
 	irq_hw_number_t		inval_irq;
+
+	/* Optional device node pointer */
+	struct device_node	*of_node;
 };
 
 /* The main irq map itself is an array of NR_IRQ entries containing the
···
 
 /**
  * irq_alloc_host - Allocate a new irq_host data structure
- * @node: device-tree node of the interrupt controller
+ * @of_node: optional device-tree node of the interrupt controller
  * @revmap_type: type of reverse mapping to use
  * @revmap_arg: for IRQ_HOST_MAP_LINEAR linear only: size of the map
  * @ops: map/unmap host callbacks
···
  * later during boot automatically (the reverse mapping will use the slow path
  * until that happens).
  */
-extern struct irq_host *irq_alloc_host(unsigned int revmap_type,
+extern struct irq_host *irq_alloc_host(struct device_node *of_node,
+				       unsigned int revmap_type,
 				       unsigned int revmap_arg,
 				       struct irq_host_ops *ops,
 				       irq_hw_number_t inval_irq);

include/asm-powerpc/mpic.h

···
 /* The instance data of a given MPIC */
 struct mpic
 {
-	/* The device node of the interrupt controller */
-	struct device_node	*of_node;
-
 	/* The remapper for this MPIC */
 	struct irq_host		*irqhost;