Re: [Outreachy kernel] [PATCH] staging: iio: dummy: complete IIO events delivery to userspace

[Greg KH <greg@kroah.com>]

On Tue, Oct 27, 2015 at 08:40:56PM +0200, Ioana Ciornei 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@gmail.com>
> Fixes: fd2bb310ca ("Staging: iio: Move evgen interrupt generation to irq_work")
> Acked-by: Daniel Baluta <daniel.baluta@intel.com>
> ---
> rebased on linux-iio tree

Daniel, can you forward this to the iio developers, I can't take this as
it doesn't apply to my tree :(

thanks,

greg k-h