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[PATCH] genirq: add IRQ_NOPROBE support

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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>
This commit is contained in:
Thomas Gleixner 2006-06-29 02:24:49 -07:00 committed by Linus Torvalds
parent a4633adcdb
commit 3418d72404
3 changed files with 7 additions and 2 deletions
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1
include/linux/irq.h
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@ -40,6 +40,7 @@
# define CHECK_IRQ_PER_CPU(var) 0 # define CHECK_IRQ_PER_CPU(var) 0
#endif #endif
#define IRQ_NOPROBE 512 /* IRQ is not valid for probing */
/** /**
* struct hw_interrupt_type - hardware interrupt type descriptor * struct hw_interrupt_type - hardware interrupt type descriptor
* *

4
kernel/irq/autoprobe.c
View File

@ -40,7 +40,7 @@ unsigned long probe_irq_on(void)
desc = irq_desc + i; desc = irq_desc + i;
spin_lock_irq(&desc->lock); spin_lock_irq(&desc->lock);
if (!desc->action) if (!desc->action && !(desc->status & IRQ_NOPROBE))
desc->chip->startup(i); desc->chip->startup(i);
spin_unlock_irq(&desc->lock); spin_unlock_irq(&desc->lock);
} }
@ -57,7 +57,7 @@ unsigned long probe_irq_on(void)
desc = irq_desc + i; desc = irq_desc + i;
spin_lock_irq(&desc->lock); spin_lock_irq(&desc->lock);
if (!desc->action) { if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
desc->status |= IRQ_AUTODETECT | IRQ_WAITING; desc->status |= IRQ_AUTODETECT | IRQ_WAITING;
if (desc->chip->startup(i)) if (desc->chip->startup(i))
desc->status |= IRQ_PENDING; desc->status |= IRQ_PENDING;

4
kernel/irq/manage.c
View File

@ -118,6 +118,10 @@ void enable_irq(unsigned int irq)
WARN_ON(1); WARN_ON(1);
break; break;
case 1: { case 1: {
unsigned int status = desc->status & ~IRQ_DISABLED;
/* Prevent probing on this irq: */
desc->status = status | IRQ_NOPROBE;
check_irq_resend(desc, irq); check_irq_resend(desc, irq);
/* fall-through */ /* fall-through */
} }