[PATCH] genirq: add IRQ_NOPROBE support
Introduce IRQ_NOPROBE: enables platforms to control chip-probing.
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>
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 9a39756..b2fcf33 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -40,6 +40,7 @@
# define CHECK_IRQ_PER_CPU(var) 0
#endif
+#define IRQ_NOPROBE 512 /* IRQ is not valid for probing */
/**
* struct hw_interrupt_type - hardware interrupt type descriptor
*
diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
index 5c988bb..ed98c7d 100644
--- a/kernel/irq/autoprobe.c
+++ b/kernel/irq/autoprobe.c
@@ -40,7 +40,7 @@
desc = irq_desc + i;
spin_lock_irq(&desc->lock);
- if (!desc->action)
+ if (!desc->action && !(desc->status & IRQ_NOPROBE))
desc->chip->startup(i);
spin_unlock_irq(&desc->lock);
}
@@ -57,7 +57,7 @@
desc = irq_desc + i;
spin_lock_irq(&desc->lock);
- if (!desc->action) {
+ if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
desc->status |= IRQ_AUTODETECT | IRQ_WAITING;
if (desc->chip->startup(i))
desc->status |= IRQ_PENDING;
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index cffde48..90a944a 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -118,6 +118,10 @@
WARN_ON(1);
break;
case 1: {
+ unsigned int status = desc->status & ~IRQ_DISABLED;
+
+ /* Prevent probing on this irq: */
+ desc->status = status | IRQ_NOPROBE;
check_irq_resend(desc, irq);
/* fall-through */
}