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authorThomas Gleixner <tglx@linutronix.de>2006-06-29 02:24:49 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-29 10:26:24 -0700
commit6550c775cb5ee94c132d93d84de3bb23f0abf37b (patch)
tree818ae46cfe30265bbecc095262de53e9c8dcb012
parent3418d72404e35eb19e7995cbf3e7a76ba8fefbce (diff)
[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>
-rw-r--r--include/linux/irq.h1
-rw-r--r--kernel/irq/manage.c4
2 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h
index b2fcf330cf2..1df49ec7f82 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 90a944a7fad..cae900a849c 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;