The IOAPIC hack that does a level=>edge to mask does not disable
interrupts. So we can receive interrupts when masked, and this means
that we can miss interrupts that arrive when the thread is handling
them.
This patch adds the "IRQ_PENDING" logic of the edge irqs to be
able to catch interrupts coming in when supposably "masked".
Signed-off-by: Steven Rostedt <[email protected]>
Index: linux-2.6.21-rt-hack/kernel/irq/chip.c
===================================================================
--- linux-2.6.21-rt-hack.orig/kernel/irq/chip.c
+++ linux-2.6.21-rt-hack/kernel/irq/chip.c
@@ -398,8 +398,10 @@ handle_fasteoi_irq(unsigned int irq, str
spin_lock(&desc->lock);
- if (unlikely(desc->status & IRQ_INPROGRESS))
+ if (unlikely(desc->status & IRQ_INPROGRESS)) {
+ desc->status |= IRQ_PENDING;
goto out;
+ }
desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
kstat_cpu(cpu).irqs[irq]++;
--
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