On Tue, Dec 02, 2014 at 09:28:37AM +0000, Terje Frøysa wrote:
> Dear forum,
>
> Question:
> If a driver is deemed buggy and the IRQ disabled, why is it still serving the
> interrupts?
>
> Running Debian 3.8.13-bone67 and Xenomai 2.6.4
>
> At opening call, my GPIO RTDM IRQ driver enables a GPIO line w/irq.
> My user-space program issues read-requests to receive a time-stamp for each
> irq.
> The irq handler is very compact. It only reads the system time, rises a
> semaphore if not already up and returns RT_INTR_HANDLED.
>
> When starting (open + loop w/reads), the dmesg log-message appears: "IRQ155
> not handled. Disabling IRQ line".
> It appears only once in the start.
> Never-the-less, the interrupts are still handled and keep coming.
Well, probably because the code re-enables the irq line ?
--
Gilles.
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