Messages in this thread | | | Date | Mon, 6 Jun 2011 17:28:40 +0200 | From | David Jander <> | Subject | Why does handle_simple_irq() require IRQ's to be disabled? |
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Hi,
I am trying to implement/fix interrupt controller functionality in gpio/pca953x.c, and for some reason which I don't understand, I need to disable interrupts with local_irq_disable() before calling generic_handle_irq(). This does not seem right. If I follow the code of handle_simple_irq(), the handler function setup for this IRQ, I get to handle_irq_event_percpu(), which has a WARN_ONCE(!irqs_disabled(),... This WARN is triggered, since nobody explicitly disables interrupts. Why?
generic_hanlde_irq() is called from a threaded interrupt handler of the parent of this interrupt controller, and calling local_irq_disable() here seems like a crime. What am I doing wrong?
Best regards,
-- David Jander Protonic Holland.
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