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genirq: explicitly mask a freed irq

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When an interrupt is freed, the shutdown or the disable callback
is called for that interrupt. These calls might not be implemented
or even if they were, might not mask the interrupt.

Explicitly mask the interrupt when it is freed. If not masked, the
interrupt could trigger, set the pending bit in the irq controller
and cause unnecessary wakeup or exits from idle power collapse.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>

Conflicts:

	kernel/irq/manage.c
This commit is contained in:
Abhijeet Dharmapurikar
2011-09-09 14:11:00 -07:00
committed by Rohit Vaswani
parent 18f1fe25ad
commit aeef1962d0
1 changed files with 8 additions and 1 deletions
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9
kernel/irq/manage.c
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@@ -1237,9 +1237,16 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
#endif
/* If this was the last handler, shut down the IRQ line: */
if (!desc->action)
if (!desc->action) {
irq_shutdown(desc);
/* Explicitly mask the interrupt */
if (desc->irq_data.chip->irq_mask)
desc->irq_data.chip->irq_mask(&desc->irq_data);
else if (desc->irq_data.chip->irq_mask_ack)
desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
}
#ifdef CONFIG_SMP
/* make sure affinity_hint is cleaned up */
if (WARN_ON_ONCE(desc->affinity_hint))