Messages in this thread | | | Date | Thu, 29 Nov 2007 16:33:39 +0100 | From | "Remy Bohmer" <> | Subject | Re: [PATCH PREEMPT_RT]: On AT91 ARM: GPIO Interrupt handling can/will stall forever |
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Hello Russell,
> While I realise that, I'm telling you that the _problem_ is being > caused by the wrong handler being used.
Okay, I believe you... (someone told me once, Russell is right, and if you do not believe him, he is still right ;-)
> SA1100 and PXA have exactly the same setup. They use the correct > handler. Why is AT91 special?
This remark is what convinced me :-))
I changed the interrupt handler from the simple_irq to the edge_irq, and it works...!! (I added a noop routine for that .ack part, because there is no ack)
I believe I was too focussed on the masking bug in the RT kernel on the simple_irq() that I did not see that for the AT91 series the edge type interrupt handler also works... (even better...) What I thought was 1 single bug in the RT-kernel turned out to be a number of things together that aren't correct, even for mainline.
So, to come to a conclusion: The masking bug in RT is still there in the simple_irq path, and masking has to be removed from the simple_irq code. Also for mainline. AT91 can live without simple_irq. I think we are in sync again...
I will post a patch for the AT91 later on, after some more testing.
Kind Regards,
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