[POWERPC] Invert null match behaviour for irq_hosts

Currently if you don't specify a match callback for your irq_host it's
assumed you match everything. This is a kind of opt-out approach, and
turns out to be the exception rather than the rule.

So change the semantics to be opt-in, ie. you don't match anything unless
you provide a match callback.  This in itself isn't very useful, but will
allow us to provide a default match implementation in a subsequent patch.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 79b451247b89..30fb8e2c5c9d 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -523,7 +523,7 @@ 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 != NULL && h->ops->match(h, node)) {
                         found = h;
                         break;
                 }