From 6550c775cb5ee94c132d93d84de3bb23f0abf37b Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 29 Jun 2006 02:24:49 -0700
Subject: [PATCH] [PATCH] genirq: add IRQ_NOREQUEST support
Enable platforms to disable request_irq() for certain interrupts.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
include/linux/irq.h | 1 +
kernel/irq/manage.c | 4 +++-
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/include/linux/irq.h b/include/linux/irq.h
index b2fcf330cf2e0..1df49ec7f8204 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -41,6 +41,7 @@
#endif
#define IRQ_NOPROBE 512 /* IRQ is not valid for probing */
+#define IRQ_NOREQUEST 1024 /* IRQ cannot be requested */
/**
* struct hw_interrupt_type - hardware interrupt type descriptor
*
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 90a944a7fadcf..cae900a849c43 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -141,7 +141,7 @@ int can_request_irq(unsigned int irq, unsigned long irqflags)
{
struct irqaction *action;
- if (irq >= NR_IRQS)
+ if (irq >= NR_IRQS || irq_desc[irq].status & IRQ_NOREQUEST)
return 0;
action = irq_desc[irq].action;
@@ -356,6 +356,8 @@ int request_irq(unsigned int irq,
return -EINVAL;
if (irq >= NR_IRQS)
return -EINVAL;
+ if (irq_desc[irq].status & IRQ_NOREQUEST)
+ return -EINVAL;
if (!handler)
return -EINVAL;
--
2.30.2