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genirq: suppress resend of level interrupts

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Level type interrupts are resent by the interrupt hardware when they are
still active at irq_enable().

Suppress the resend mechanism for interrupts marked as level.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Gleixner 2007-08-12 15:46:35 +00:00 committed by Linus Torvalds
parent 496634217e
commit 2464286ace
1 changed files with 6 additions and 1 deletions
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7
kernel/irq/resend.c
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@ -62,7 +62,12 @@ void check_irq_resend(struct irq_desc *desc, unsigned int irq)
*/
desc->chip->enable(irq);
if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
/*
* We do not resend level type interrupts. Level type
* interrupts are resent by hardware when they are still
* active.
*/
if ((status & (IRQ_LEVEL | IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
desc->status = (status & ~IRQ_PENDING) | IRQ_REPLAY;
if (!desc->chip || !desc->chip->retrigger ||