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genirq/chip: Rework handle_level_irq()

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Use the new helpers to decide whether the interrupt should be handled and
switch the descriptor locking to guard().

Fixup the kernel doc comment while at it.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20250429065420.926362488@linutronix.de
This commit is contained in:
Thomas Gleixner 2025-04-29 08:55:10 +02:00
parent a155777175
commit 2334c45521
1 changed files with 9 additions and 23 deletions
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32
kernel/irq/chip.c
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@ -609,40 +609,26 @@ static void cond_unmask_irq(struct irq_desc *desc)
}
/**
* handle_level_irq - Level type irq handler
* @desc: the interrupt description structure for this irq
* handle_level_irq - Level type irq handler
* @desc: the interrupt description structure for this irq
*
* Level type interrupts are active as long as the hardware line has
* the active level. This may require to mask the interrupt and unmask
* it after the associated handler has acknowledged the device, so the
* interrupt line is back to inactive.
* Level type interrupts are active as long as the hardware line has the
* active level. This may require to mask the interrupt and unmask it after
* the associated handler has acknowledged the device, so the interrupt
* line is back to inactive.
*/
void handle_level_irq(struct irq_desc *desc)
{
raw_spin_lock(&desc->lock);
guard(raw_spinlock)(&desc->lock);
mask_ack_irq(desc);
if (!irq_can_handle_pm(desc))
goto out_unlock;
desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
/*
* If its disabled or no action available
* keep it masked and get out of here
*/
if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
desc->istate |= IRQS_PENDING;
goto out_unlock;
}
if (!irq_can_handle(desc))
return;
kstat_incr_irqs_this_cpu(desc);
handle_irq_event(desc);
cond_unmask_irq(desc);
out_unlock:
raw_spin_unlock(&desc->lock);
}
EXPORT_SYMBOL_GPL(handle_level_irq);