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    SubjectRe: [PATCH PREEMPT_RT]: On AT91 ARM: GPIO Interrupt handling can/will stall forever
    On Tue, 2007-11-27 at 07:25 -0800, Daniel Walker wrote:
    > On Tue, 2007-11-27 at 10:11 -0500, Steven Rostedt wrote:
    > > Thomas,
    > >
    > > Can you ACK or NACK this patch. I know you play with a bunch of
    > > hardware that this patch may affect.
    > >
    > My two cents, I think it's needed (or something like it).. It looks like
    > handle_simple_irq normally expects a custom cascade type handler to
    > unmask on return. When you switch to a threaded handler the cascade
    > handler is gone and can't unmask..

    I take this back .. The comment at the top of handle_simple_irq() is,

    * Note: The caller is expected to handle the ack, clear, mask and
    * unmask issues if necessary.

    So we shouldn't need any flow control unless there is some other

    Additionally, we have a patch in the real time tree called
    "irq-mask-fix.patch" which adds an "unmask" to handle_simple_irq, but as
    the note says we don't need flow control..


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      Last update: 2007-11-27 17:05    [W:0.019 / U:0.056 seconds]
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