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irq: clear kstat_irqs 

Impact: get correct kstat_irqs [/proc/interrupts] for msi/msi-x etc

need to call clear_kstat_irqs(), so when we reuse that irq_desc,
we get correct kstat in /proc/interrupts.

This makes /proc/interrupts not have <NULL> entries.

Don't need to worry about arch that doesn't support genirq, because they
will not call dynamic_irq_cleanup().

v2: simplify and make clear_kstat_irqs more robust

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2009-02-08 16:18:03 -08:00 committed by Ingo Molnar
parent 4d87c5bec5
commit 0f3c2a89c1
3 changed files with 7 additions and 0 deletions
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1
kernel/irq/chip.c
View File

@ -78,6 +78,7 @@ void dynamic_irq_cleanup(unsigned int irq)
desc->handle_irq = handle_bad_irq;
desc->chip = &no_irq_chip;
desc->name = NULL;
clear_kstat_irqs(desc);
spin_unlock_irqrestore(&desc->lock, flags);
}

5
kernel/irq/handle.c
View File

@ -242,6 +242,11 @@ struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
}
#endif /* !CONFIG_SPARSE_IRQ */
void clear_kstat_irqs(struct irq_desc *desc)
{
memset(desc->kstat_irqs, 0, nr_cpu_ids * sizeof(*(desc->kstat_irqs)));
}
/*
* What should we do if we get a hw irq event on an illegal vector?
* Each architecture has to answer this themself.

1
kernel/irq/internals.h
View File

@ -15,6 +15,7 @@ extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
extern struct lock_class_key irq_desc_lock_class;
extern void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr);
extern void clear_kstat_irqs(struct irq_desc *desc);
extern spinlock_t sparse_irq_lock;
extern struct irq_desc *irq_desc_ptrs[NR_IRQS];