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Index: linux-2.6.33.2/kernel/irq/chip.c
===================================================================
--- linux-2.6.33.2.orig/kernel/irq/chip.c 2010-04-02 01:02:33.000000000 +0200
+++ linux-2.6.33.2/kernel/irq/chip.c 2010-04-02 23:37:40.000000000 +0200
@@ -650,6 +650,9 @@
kstat_incr_irqs_this_cpu(irq, desc);
+ if (unlikely(!desc->action || (desc->status & IRQ_DISABLED)))
+ return;
+
if (desc->chip->ack)
desc->chip->ack(irq);
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