[PATCH] genirq: Add IRQS_PENDING for nested and simple irq

[Ning Jiang]

Usually nested and simple irq act as second level in interrupt
distribution tree, in suspend, we need to keep first level irq
functional by irq flag IRQF_NO_SUSPEND and check the 'pending'
state in the second level.

More information can be found in the log of commit:

commit d4dc0f90d243fb54cfbca6601c9a7c5a758e437f
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Date:   Wed Apr 25 12:54:54 2012 +0200

    genirq: Allow check_wakeup_irqs to notice level-triggered interrupts

Signed-off-by: Ning Jiang <ning.n.jiang@xxxxxxxxx>
---
 kernel/irq/chip.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 741f836..5bec667 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -275,8 +275,10 @@ void handle_nested_irq(unsigned int irq)
 	kstat_incr_irqs_this_cpu(irq, desc);

 	action = desc->action;
-	if (unlikely(!action || irqd_irq_disabled(&desc->irq_data)))
+	if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
+		desc->istate |= IRQS_PENDING;
 		goto out_unlock;
+	}

 	irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 	raw_spin_unlock_irq(&desc->lock);
@@ -324,8 +326,10 @@ handle_simple_irq(unsigned int irq, struct irq_desc *desc)
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 	kstat_incr_irqs_this_cpu(irq, desc);

-	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data)))
+	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
+		desc->istate |= IRQS_PENDING;
 		goto out_unlock;
+	}

 	handle_irq_event(desc);

-- 
1.7.1

Thanks,
Ning
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