[POWERPC] Provide a default irq_host match, which matches on an exact of_node

The most common match semantic is an exact match based on the device node.
So provide a default implementation that does this, and hook it up if no
match routine is specified.

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

1 files changed, 9 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 30fb8e2c5c9d..d5c7e4cf2b39 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -418,6 +418,11 @@ irq_hw_number_t virq_to_hw(unsigned int virq)
 }
 EXPORT_SYMBOL_GPL(virq_to_hw);
 
+static int default_irq_host_match(struct irq_host *h, struct device_node *np)
+{
+        return h->of_node != NULL && h->of_node == np;
+}
+
 __init_refok struct irq_host *irq_alloc_host(struct device_node *of_node,
                                 unsigned int revmap_type,
                                 unsigned int revmap_arg,
@@ -449,6 +454,9 @@ __init_refok struct irq_host *irq_alloc_host(struct device_node *of_node,
         host->ops = ops;
         host->of_node = of_node;
 
+        if (host->ops->match == NULL)
+                host->ops->match = default_irq_host_match;
+
         spin_lock_irqsave(&irq_big_lock, flags);
 
         /* If it's a legacy controller, check for duplicates and
@@ -523,7 +531,7 @@ struct irq_host *irq_find_host(struct device_node *node)
          */
         spin_lock_irqsave(&irq_big_lock, flags);
         list_for_each_entry(h, &irq_hosts, link)
-                if (h->ops->match != NULL && h->ops->match(h, node)) {
+                if (h->ops->match(h, node)) {
                         found = h;
                         break;
                 }