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[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>
hifive-unleashed-5.1
Thomas Gleixner 2006-06-29 02:24:50 -07:00 committed by Linus Torvalds
parent 6550c775cb
commit 94d39e1f6e
3 changed files with 13 additions and 7 deletions
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1
include/linux/irq.h
View File

@ -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
*

1
kernel/irq/handle.c
View File

@ -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

18
kernel/irq/manage.c
View File

@ -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);