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

26 files changed, 76 insertions, 109 deletions

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index dfad0e469eec..79b451247b89 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -418,10 +418,11 @@ irq_hw_number_t virq_to_hw(unsigned int virq)
 }
 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);
@@ -446,6 +447,7 @@ __init_refok struct irq_host *irq_alloc_host(unsigned int revmap_type,
         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);
 
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_pic.c b/arch/powerpc/platforms/52xx/mpc52xx_pic.c
index 8c464c55b5d0..1d793e4b8d56 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_pic.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_pic.c
@@ -244,7 +244,7 @@ static struct irq_chip mpc52xx_sdma_irqchip = {
 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,
@@ -419,14 +419,13 @@ void __init mpc52xx_init_irq(void)
          * 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");
 }
 
diff --git a/arch/powerpc/platforms/82xx/mpc82xx_ads.c b/arch/powerpc/platforms/82xx/mpc82xx_ads.c
index c0a0c56ac5b3..91ddbd2f477d 100644
--- a/arch/powerpc/platforms/82xx/mpc82xx_ads.c
+++ b/arch/powerpc/platforms/82xx/mpc82xx_ads.c
@@ -61,7 +61,6 @@ static struct {
 
 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)
@@ -401,7 +400,7 @@ m82xx_pci_irq_demux(unsigned int irq, struct irq_desc *desc)
 
 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,
@@ -478,7 +477,6 @@ void m82xx_pci_init_irq(void)
                 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)) {
@@ -490,7 +488,6 @@ void m82xx_pci_init_irq(void)
             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;
@@ -501,7 +498,7 @@ void m82xx_pci_init_irq(void)
         *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;
 }
diff --git a/arch/powerpc/platforms/cell/axon_msi.c b/arch/powerpc/platforms/cell/axon_msi.c
index 4c9ab5b70bae..bdd97bb2446d 100644
--- a/arch/powerpc/platforms/cell/axon_msi.c
+++ b/arch/powerpc/platforms/cell/axon_msi.c
@@ -64,7 +64,6 @@
 
 
 struct axon_msic {
-        struct device_node *dn;
         struct irq_host *irq_host;
         __le32 *fifo;
         dcr_host_t dcr_host;
@@ -297,9 +296,7 @@ static int msic_host_map(struct irq_host *h, unsigned int virq,
 
 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 = {
@@ -314,7 +311,8 @@ static int axon_msi_notify_reboot(struct notifier_block *nb,
         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);
@@ -370,8 +368,8 @@ static int axon_msi_setup_one(struct device_node *dn)
 
         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);
@@ -387,8 +385,6 @@ static int axon_msi_setup_one(struct device_node *dn)
                 goto out_free_host;
         }
 
-        msic->dn = of_node_get(dn);
-
         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);
diff --git a/arch/powerpc/platforms/cell/interrupt.c b/arch/powerpc/platforms/cell/interrupt.c
index 47264e722029..c29e634177fa 100644
--- a/arch/powerpc/platforms/cell/interrupt.c
+++ b/arch/powerpc/platforms/cell/interrupt.c
@@ -381,7 +381,7 @@ static int __init setup_iic(void)
 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);
diff --git a/arch/powerpc/platforms/cell/spider-pic.c b/arch/powerpc/platforms/cell/spider-pic.c
index 05f4b3d3d756..4309c2cbbeb9 100644
--- a/arch/powerpc/platforms/cell/spider-pic.c
+++ b/arch/powerpc/platforms/cell/spider-pic.c
@@ -63,7 +63,6 @@ enum {
 
 struct spider_pic {
         struct irq_host         *host;
-        struct device_node      *of_node;
         void __iomem            *regs;
         unsigned int            node_id;
 };
@@ -178,8 +177,7 @@ static struct irq_chip spider_pic = {
 
 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,
@@ -247,18 +245,18 @@ static unsigned int __init spider_find_cascade_and_node(struct spider_pic *pic)
          * 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]);
@@ -308,15 +306,13 @@ 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(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++) {
                 void __iomem *cfg = pic->regs + TIR_CFGA + 8 * i;
diff --git a/arch/powerpc/platforms/celleb/interrupt.c b/arch/powerpc/platforms/celleb/interrupt.c
index 98e6665681d3..4ecdf06e421b 100644
--- a/arch/powerpc/platforms/celleb/interrupt.c
+++ b/arch/powerpc/platforms/celleb/interrupt.c
@@ -242,7 +242,7 @@ void __init beatic_init_IRQ(void)
         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);
diff --git a/arch/powerpc/platforms/iseries/irq.c b/arch/powerpc/platforms/iseries/irq.c
index 63b33675848b..36667460c922 100644
--- a/arch/powerpc/platforms/iseries/irq.c
+++ b/arch/powerpc/platforms/iseries/irq.c
@@ -369,7 +369,8 @@ void __init iSeries_init_IRQ(void)
         /* 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);
 
diff --git a/arch/powerpc/platforms/powermac/pic.c b/arch/powerpc/platforms/powermac/pic.c
index 87cd6805171a..999f5e160897 100644
--- a/arch/powerpc/platforms/powermac/pic.c
+++ b/arch/powerpc/platforms/powermac/pic.c
@@ -384,7 +384,7 @@ static void __init pmac_pic_probe_oldstyle(void)
         /*
          * 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);
diff --git a/arch/powerpc/platforms/ps3/interrupt.c b/arch/powerpc/platforms/ps3/interrupt.c
index 67e32ec9b37e..30b9f4c6eb55 100644
--- a/arch/powerpc/platforms/ps3/interrupt.c
+++ b/arch/powerpc/platforms/ps3/interrupt.c
@@ -726,7 +726,7 @@ void __init ps3_init_IRQ(void)
         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);
diff --git a/arch/powerpc/platforms/pseries/xics.c b/arch/powerpc/platforms/pseries/xics.c
index 5bd90a7eb763..5ddb0259b1fb 100644
--- a/arch/powerpc/platforms/pseries/xics.c
+++ b/arch/powerpc/platforms/pseries/xics.c
@@ -540,7 +540,7 @@ static void __init xics_init_host(void)
                 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);
diff --git a/arch/powerpc/sysdev/commproc.c b/arch/powerpc/sysdev/commproc.c
index e8e79f83d198..05dc30b80e29 100644
--- a/arch/powerpc/sysdev/commproc.c
+++ b/arch/powerpc/sysdev/commproc.c
@@ -50,7 +50,6 @@ static uint host_end;    /* end + 1 */
 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)
@@ -97,7 +96,7 @@ int cpm_get_irq(void)
 
 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,
@@ -165,9 +164,8 @@ unsigned int cpm_pic_init(void)
 
         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;
diff --git a/arch/powerpc/sysdev/cpm2_pic.c b/arch/powerpc/sysdev/cpm2_pic.c
index eabfe06fe05c..d9ab30c66ebf 100644
--- a/arch/powerpc/sysdev/cpm2_pic.c
+++ b/arch/powerpc/sysdev/cpm2_pic.c
@@ -50,7 +50,6 @@
 
 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];
@@ -208,7 +207,7 @@ unsigned int cpm2_get_irq(void)
 
 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,
@@ -273,8 +272,8 @@ void cpm2_pic_init(struct device_node *node)
         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;
diff --git a/arch/powerpc/sysdev/i8259.c b/arch/powerpc/sysdev/i8259.c
index ad87adc975bc..7c1b27ac7d3c 100644
--- a/arch/powerpc/sysdev/i8259.c
+++ b/arch/powerpc/sysdev/i8259.c
@@ -25,7 +25,6 @@ static unsigned char cached_8259[2] = { 0xff, 0xff };
 
 static DEFINE_SPINLOCK(i8259_lock);
 
-static struct device_node *i8259_node;
 static struct irq_host *i8259_host;
 
 /*
@@ -165,7 +164,7 @@ static struct resource pic_edgectrl_iores = {
 
 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,
@@ -276,9 +275,8 @@ void i8259_init(struct device_node *node, unsigned long intack_addr)
         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;
diff --git a/arch/powerpc/sysdev/ipic.c b/arch/powerpc/sysdev/ipic.c
index 473c415e9e25..05a56e55804c 100644
--- a/arch/powerpc/sysdev/ipic.c
+++ b/arch/powerpc/sysdev/ipic.c
@@ -511,10 +511,8 @@ static struct irq_chip ipic_irq_chip = {
 
 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,
@@ -568,9 +566,8 @@ struct ipic * __init ipic_init(struct device_node *node, unsigned int flags)
                 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) {
diff --git a/arch/powerpc/sysdev/ipic.h b/arch/powerpc/sysdev/ipic.h
index c28e589877eb..bb309a501b2d 100644
--- a/arch/powerpc/sysdev/ipic.h
+++ b/arch/powerpc/sysdev/ipic.h
@@ -48,9 +48,6 @@ struct ipic {
 
         /* The "linux" controller struct */
         struct irq_chip         hc_irq;
-
-        /* The device node of the interrupt controller */
-        struct device_node      *of_node;
 };
 
 struct ipic_info {
diff --git a/arch/powerpc/sysdev/mpc8xx_pic.c b/arch/powerpc/sysdev/mpc8xx_pic.c
index 2fc2bcd79b5e..f20a4d43d104 100644
--- a/arch/powerpc/sysdev/mpc8xx_pic.c
+++ b/arch/powerpc/sysdev/mpc8xx_pic.c
@@ -19,7 +19,6 @@
 
 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];
@@ -122,7 +121,7 @@ unsigned int mpc8xx_get_irq(void)
 
 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,
@@ -176,22 +175,24 @@ int mpc8xx_pic_init(void)
                 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;
 }
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 74c64c0d3b71..25a81f73cecf 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -271,7 +271,7 @@ static void _mpic_map_dcr(struct mpic *mpic, struct mpic_reg_bank *rb,
 {
         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));
 }
 
@@ -861,10 +861,8 @@ static struct irq_chip mpic_irq_ht_chip = {
 
 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,
@@ -985,10 +983,9 @@ struct mpic * __init mpic_alloc(struct device_node *node,
         
         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);
diff --git a/arch/powerpc/sysdev/mpic_msi.c b/arch/powerpc/sysdev/mpic_msi.c
index b076793033c2..9ca4d8f444ff 100644
--- a/arch/powerpc/sysdev/mpic_msi.c
+++ b/arch/powerpc/sysdev/mpic_msi.c
@@ -117,16 +117,17 @@ static int mpic_msi_reserve_dt_hwirqs(struct mpic *mpic)
         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;
         }
 
diff --git a/arch/powerpc/sysdev/mv64x60_pic.c b/arch/powerpc/sysdev/mv64x60_pic.c
index 01d316287772..a145bfd003c7 100644
--- a/arch/powerpc/sysdev/mv64x60_pic.c
+++ b/arch/powerpc/sysdev/mv64x60_pic.c
@@ -204,7 +204,7 @@ static struct irq_chip mv64x60_chip_gpp = {
 
 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[] = {
@@ -253,14 +253,12 @@ void __init mv64x60_init_irq(void)
         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,
                  mv64x60_cached_gpp_mask);
diff --git a/arch/powerpc/sysdev/qe_lib/qe_ic.c b/arch/powerpc/sysdev/qe_lib/qe_ic.c
index 4d1dcb45963d..55e6f394af82 100644
--- a/arch/powerpc/sysdev/qe_lib/qe_ic.c
+++ b/arch/powerpc/sysdev/qe_lib/qe_ic.c
@@ -245,10 +245,8 @@ static struct irq_chip qe_ic_irq_chip = {
 
 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,
@@ -352,9 +350,8 @@ void __init qe_ic_init(struct device_node *node, unsigned int flags)
                 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);
diff --git a/arch/powerpc/sysdev/qe_lib/qe_ic.h b/arch/powerpc/sysdev/qe_lib/qe_ic.h
index 9a631adb189d..c1361d005a8a 100644
--- a/arch/powerpc/sysdev/qe_lib/qe_ic.h
+++ b/arch/powerpc/sysdev/qe_lib/qe_ic.h
@@ -84,9 +84,6 @@ struct qe_ic {
         /* 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;
diff --git a/arch/powerpc/sysdev/tsi108_pci.c b/arch/powerpc/sysdev/tsi108_pci.c
index cf0bfbd73401..b41492a8d600 100644
--- a/arch/powerpc/sysdev/tsi108_pci.c
+++ b/arch/powerpc/sysdev/tsi108_pci.c
@@ -52,7 +52,6 @@
 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);
@@ -407,7 +406,7 @@ static int pci_irq_host_map(struct irq_host *h, unsigned int virq,
 
 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 = {
@@ -433,10 +432,11 @@ void __init tsi108_pci_int_init(struct device_node *node)
 {
         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;
         }
 
diff --git a/arch/powerpc/sysdev/uic.c b/arch/powerpc/sysdev/uic.c
index 47180b3fca56..bf3766754173 100644
--- a/arch/powerpc/sysdev/uic.c
+++ b/arch/powerpc/sysdev/uic.c
@@ -56,9 +56,6 @@ struct uic {
 
         /* 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)
@@ -220,8 +217,7 @@ out_unlock:
 
 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,
@@ -291,7 +287,6 @@ static struct uic * __init uic_init_one(struct device_node *node)
 
         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 "
@@ -308,8 +303,8 @@ static struct uic * __init uic_init_one(struct device_node *node)
         }
         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? */
diff --git a/include/asm-powerpc/irq.h b/include/asm-powerpc/irq.h
index 0485c53db2b5..1392db456523 100644
--- a/include/asm-powerpc/irq.h
+++ b/include/asm-powerpc/irq.h
@@ -124,6 +124,9 @@ struct irq_host {
         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
@@ -142,7 +145,7 @@ extern irq_hw_number_t virq_to_hw(unsigned int virq);
 
 /**
  * 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
@@ -156,7 +159,8 @@ extern irq_hw_number_t virq_to_hw(unsigned int virq);
  * 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);
diff --git a/include/asm-powerpc/mpic.h b/include/asm-powerpc/mpic.h
index 262db6b8da73..0eb3ab9ec2bb 100644
--- a/include/asm-powerpc/mpic.h
+++ b/include/asm-powerpc/mpic.h
@@ -240,9 +240,6 @@ struct mpic_irq_save {
 /* 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;