[PATCH -tip] irq: DEBUG_SHIRQ executed on irq setup failure

[Luis Henriques <henrix@sapo.pt>]

When requesting an IRQ, the DEBUG_SHIRQ code executes a fake IRQ just to make
sure the driver is ready to receive an IRQ immediately.  The problem was that
this fake IRQ was being executed even if interrupt line failed to be allocated
by __setup_irq.

Signed-off-by: Luis Henriques <henrix@sapo.pt>
---
 kernel/irq/manage.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index a3eb7ba..8e1be16 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -914,7 +914,7 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler,
 		kfree(action);
 
 #ifdef CONFIG_DEBUG_SHIRQ
-	if (irqflags & IRQF_SHARED) {
+	if (retval && (irqflags & IRQF_SHARED)) {
 		/*
 		 * It's a shared IRQ -- the driver ought to be prepared for it
 		 * to happen immediately, so let's make sure....
-- 
1.6.2.1