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Merge git://git.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-genirq

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* git://git.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-genirq:
  genirq: reenable a nobody cared disabled irq when a new driver arrives
This commit is contained in:
Linus Torvalds 2008-05-02 08:22:36 -07:00
commit 3482a6f1d1
3 changed files with 35 additions and 19 deletions
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1
include/linux/irq.h
View file

@ -61,6 +61,7 @@ typedef void (*irq_flow_handler_t)(unsigned int irq,
#define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */
#define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */
#define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */
#define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */
#ifdef CONFIG_IRQ_PER_CPU
# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)

49
kernel/irq/manage.c
View file

@ -150,6 +150,26 @@ void disable_irq(unsigned int irq)
}
EXPORT_SYMBOL(disable_irq);
static void __enable_irq(struct irq_desc *desc, unsigned int irq)
{
switch (desc->depth) {
case 0:
printk(KERN_WARNING "Unbalanced enable for IRQ %d\n", 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 */
}
default:
desc->depth--;
}
}
/**
* enable_irq - enable handling of an irq
* @irq: Interrupt to enable
@ -169,22 +189,7 @@ void enable_irq(unsigned int irq)
return;
spin_lock_irqsave(&desc->lock, flags);
switch (desc->depth) {
case 0:
printk(KERN_WARNING "Unbalanced enable for IRQ %d\n", 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 */
}
default:
desc->depth--;
}
__enable_irq(desc, irq);
spin_unlock_irqrestore(&desc->lock, flags);
}
EXPORT_SYMBOL(enable_irq);
@ -365,7 +370,7 @@ int setup_irq(unsigned int irq, struct irqaction *new)
compat_irq_chip_set_default_handler(desc);
desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING |
IRQ_INPROGRESS);
IRQ_INPROGRESS | IRQ_SPURIOUS_DISABLED);
if (!(desc->status & IRQ_NOAUTOEN)) {
desc->depth = 0;
@ -381,6 +386,16 @@ int setup_irq(unsigned int irq, struct irqaction *new)
/* Reset broken irq detection when installing new handler */
desc->irq_count = 0;
desc->irqs_unhandled = 0;
/*
* Check whether we disabled the irq via the spurious handler
* before. Reenable it and give it another chance.
*/
if (shared && (desc->status & IRQ_SPURIOUS_DISABLED)) {
desc->status &= ~IRQ_SPURIOUS_DISABLED;
__enable_irq(desc, irq);
}
spin_unlock_irqrestore(&desc->lock, flags);
new->irq = irq;

4
kernel/irq/spurious.c
View file

@ -209,8 +209,8 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc,
* Now kill the IRQ
*/
printk(KERN_EMERG "Disabling IRQ #%d\n", irq);
desc->status |= IRQ_DISABLED;
desc->depth = 1;
desc->status |= IRQ_DISABLED | IRQ_SPURIOUS_DISABLED;
desc->depth++;
desc->chip->disable(irq);
}
desc->irqs_unhandled = 0;