On Tue, Oct 27, 2015 at 8:40 PM, Ioana Ciornei <ciorneiioana@xxxxxxxxx> wrote:
> Starting with commit fd2bb310ca (Staging: iio: Move evgen interrupt
> generation to irq_work) event processing is handled by calling
> both the top half and the threaded part properly simulating real
> hardware interrupts making use of threaded interrupts.
> This way the processing is split in 2 parts:
>
> * the IRQ handler that runs in IRQ context and only saves the event
> timestamp
> * the threaded handler that runs in process context, reads the events
> and pushes the in the userspace.
>
> If the IRQ handler returns IRQ_HANDLED the threaded handler is not
> even being called since the interrupt is considered to be processed.
> Because the iio dummy driver processes the events in the threaded
> handler the IRQ handler must return IRQ_WAKE_THREAD so that the
> threaded part would be awakened and called.
>
> Signed-off-by: Ioana Ciornei <ciorneiioana@xxxxxxxxx>
Fixes: fd2bb310ca ("Staging: iio: Move evgen interrupt generation to irq_work")
Acked-by: Daniel Baluta <daniel.baluta@xxxxxxxxx>
> ---
> rebased on linux-iio tree
>
> drivers/iio/dummy/iio_simple_dummy_events.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iio/dummy/iio_simple_dummy_events.c b/drivers/iio/dummy/iio_simple_dummy_events.c
> index bfbf1c5..6eb600f 100644
> --- a/drivers/iio/dummy/iio_simple_dummy_events.c
> +++ b/drivers/iio/dummy/iio_simple_dummy_events.c
> @@ -159,7 +159,7 @@ static irqreturn_t iio_simple_dummy_get_timestamp(int irq, void *private)
> struct iio_dummy_state *st = iio_priv(indio_dev);
>
> st->event_timestamp = iio_get_time_ns();
> - return IRQ_HANDLED;
> + return IRQ_WAKE_THREAD;
> }
>
> /**
> --
> 2.1.4
>
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