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Index: linux-2.6.30.5/kernel/irq/chip.c
===================================================================
--- linux-2.6.30.5.orig/kernel/irq/chip.c 2009-09-02 20:09:15.000000000 +0200
+++ linux-2.6.30.5/kernel/irq/chip.c 2009-09-02 20:09:25.000000000 +0200
@@ -537,6 +537,9 @@
kstat_incr_irqs_this_cpu(irq, desc);
+ if (unlikely(!desc->action || (desc->status & IRQ_DISABLED)))
+ return;
+
if (desc->chip->ack)
desc->chip->ack(irq);