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authorThomas Gleixner <tglx@linutronix.de>2006-06-29 02:24:50 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-29 10:26:24 -0700
commit94d39e1f6e8132ea982a1d61acbe0423d3d14365 (patch)
tree68ba3666c1d2c0805089e8ffdb47da961a760450
parent6550c775cb5ee94c132d93d84de3bb23f0abf37b (diff)
[PATCH] genirq: add IRQ_NOAUTOEN support
Enable platforms to disable the automatic enabling of freshly set up irqs. 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/handle.c1
-rw-r--r--kernel/irq/manage.c18
3 files changed, 13 insertions, 7 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 1df49ec7f82..14d7e94048d 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -42,6 +42,7 @@
#define IRQ_NOPROBE 512 /* IRQ is not valid for probing */
#define IRQ_NOREQUEST 1024 /* IRQ cannot be requested */
+#define IRQ_NOAUTOEN 2048 /* IRQ will not be enabled on request irq */
/**
* struct hw_interrupt_type - hardware interrupt type descriptor
*
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 402fa3aec1e..9b398d52f1b 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -32,6 +32,7 @@ struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned = {
[0 ... NR_IRQS-1] = {
.status = IRQ_DISABLED,
.chip = &no_irq_type,
+ .depth = 1,
.lock = SPIN_LOCK_UNLOCKED,
#ifdef CONFIG_SMP
.affinity = CPU_MASK_ALL
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index cae900a849c..9ea18879fb6 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -216,13 +216,17 @@ int setup_irq(unsigned int irq, struct irqaction *new)
desc->status |= IRQ_PER_CPU;
#endif
if (!shared) {
- desc->depth = 0;
- desc->status &= ~(IRQ_DISABLED | IRQ_AUTODETECT |
- IRQ_WAITING | IRQ_INPROGRESS);
- if (desc->chip->startup)
- desc->chip->startup(irq);
- else
- desc->chip->enable(irq);
+ desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING |
+ IRQ_INPROGRESS);
+
+ if (!(desc->status & IRQ_NOAUTOEN)) {
+ desc->depth = 0;
+ desc->status &= ~IRQ_DISABLED;
+ if (desc->chip->startup)
+ desc->chip->startup(irq);
+ else
+ desc->chip->enable(irq);
+ }
}
spin_unlock_irqrestore(&desc->lock, flags);