From: Thomas Gleixner <[email protected]>
enable platforms to disable request_irq() for certain interrupts.
Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
---
include/linux/irq.h | 1 +
kernel/irq/manage.c | 4 +++-
2 files changed, 4 insertions(+), 1 deletion(-)
Index: linux-genirq.q/include/linux/irq.h
===================================================================
--- linux-genirq.q.orig/include/linux/irq.h
+++ linux-genirq.q/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
*
Index: linux-genirq.q/kernel/irq/manage.c
===================================================================
--- linux-genirq.q.orig/kernel/irq/manage.c
+++ linux-genirq.q/kernel/irq/manage.c
@@ -141,7 +141,7 @@ int can_request_irq(unsigned int irq, un
{
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;
-
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