[PATCH] genirq: add IRQ_NOPROBE support

3418d724 · Thomas Gleixner <[email protected]> · 2006-06-29 02:24:49 -07:00

Introduce IRQ_NOPROBE: enables platforms to control chip-probing.

Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Commit: 3418d72404e35eb19e7995cbf3e7a76ba8fefbce
Parents: a4633adc

Changes

3 files changed · +7 −2

File	Status	Add	Del	Content
include/linux/irq.h	modified	+1	−0	View file
kernel/irq/autoprobe.c	modified	+2	−2	View file
kernel/irq/manage.c	modified	+4	−0	View file

include/linux/irq.h

View file

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
  *

kernel/irq/autoprobe.c

View file

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 @@ unsigned long probe_irq_on(void)
 		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 @@ unsigned long probe_irq_on(void)
 		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;

kernel/irq/manage.c

View file

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 @@ void enable_irq(unsigned int irq)
 		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 */
 	}