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While reviewing the IRQ autoprobing code i found the attached buglet. probe_irq_on()/off() calls must always be in pairs, because the generic IRQ code uses a global semaphore to serialize all autoprobing activites. (which does make sense) The ARM code's probe_irq_*() implementation does not do this, but if this driver is ever used on another platform, this bug might bite. (It probably does not trigger in practice, because a zero probing mask returned should be rare - but still.) Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>