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Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq: Handle pending irqs in irq_startup()
  genirq: Unmask oneshot irqs when thread was not woken
This commit is contained in:
Linus Torvalds 2012-02-27 07:54:57 -08:00
commit faf3502a3f
4 changed files with 37 additions and 13 deletions
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4
kernel/irq/autoprobe.c
View File

@ -53,7 +53,7 @@ unsigned long probe_irq_on(void)
if (desc->irq_data.chip->irq_set_type)
desc->irq_data.chip->irq_set_type(&desc->irq_data,
IRQ_TYPE_PROBE);
irq_startup(desc);
irq_startup(desc, false);
}
raw_spin_unlock_irq(&desc->lock);
}
@ -70,7 +70,7 @@ unsigned long probe_irq_on(void)
raw_spin_lock_irq(&desc->lock);
if (!desc->action && irq_settings_can_probe(desc)) {
desc->istate |= IRQS_AUTODETECT | IRQS_WAITING;
if (irq_startup(desc))
if (irq_startup(desc, false))
desc->istate |= IRQS_PENDING;
}
raw_spin_unlock_irq(&desc->lock);

42
kernel/irq/chip.c
View File

@ -157,19 +157,22 @@ static void irq_state_set_masked(struct irq_desc *desc)
irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
}
int irq_startup(struct irq_desc *desc)
int irq_startup(struct irq_desc *desc, bool resend)
{
int ret = 0;
irq_state_clr_disabled(desc);
desc->depth = 0;
if (desc->irq_data.chip->irq_startup) {
int ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
irq_state_clr_masked(desc);
return ret;
} else {
irq_enable(desc);
}
irq_enable(desc);
return 0;
if (resend)
check_irq_resend(desc, desc->irq_data.irq);
return ret;
}
void irq_shutdown(struct irq_desc *desc)
@ -330,6 +333,24 @@ out_unlock:
}
EXPORT_SYMBOL_GPL(handle_simple_irq);
/*
* Called unconditionally from handle_level_irq() and only for oneshot
* interrupts from handle_fasteoi_irq()
*/
static void cond_unmask_irq(struct irq_desc *desc)
{
/*
* We need to unmask in the following cases:
* - Standard level irq (IRQF_ONESHOT is not set)
* - Oneshot irq which did not wake the thread (caused by a
* spurious interrupt or a primary handler handling it
* completely).
*/
if (!irqd_irq_disabled(&desc->irq_data) &&
irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot)
unmask_irq(desc);
}
/**
* handle_level_irq - Level type irq handler
* @irq: the interrupt number
@ -362,8 +383,8 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc)
handle_irq_event(desc);
if (!irqd_irq_disabled(&desc->irq_data) && !(desc->istate & IRQS_ONESHOT))
unmask_irq(desc);
cond_unmask_irq(desc);
out_unlock:
raw_spin_unlock(&desc->lock);
}
@ -417,6 +438,9 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
preflow_handler(desc);
handle_irq_event(desc);
if (desc->istate & IRQS_ONESHOT)
cond_unmask_irq(desc);
out_eoi:
desc->irq_data.chip->irq_eoi(&desc->irq_data);
out_unlock:
@ -625,7 +649,7 @@ __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
irq_settings_set_noprobe(desc);
irq_settings_set_norequest(desc);
irq_settings_set_nothread(desc);
irq_startup(desc);
irq_startup(desc, true);
}
out:
irq_put_desc_busunlock(desc, flags);

2
kernel/irq/internals.h
View File

@ -67,7 +67,7 @@ extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
extern int irq_startup(struct irq_desc *desc);
extern int irq_startup(struct irq_desc *desc, bool resend);
extern void irq_shutdown(struct irq_desc *desc);
extern void irq_enable(struct irq_desc *desc);
extern void irq_disable(struct irq_desc *desc);

2
kernel/irq/manage.c
View File

@ -1027,7 +1027,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
desc->istate |= IRQS_ONESHOT;
if (irq_settings_can_autoenable(desc))
irq_startup(desc);
irq_startup(desc, true);
else
/* Undo nested disables: */
desc->depth = 1;