On Tue, 21 Jul 2009, Dmitry Torokhov wrote: > On Tue, Jul 21, 2009 at 01:49:33PM +0100, Mark Brown wrote: > > On Tue, Jul 21, 2009 at 06:00:07PM +0530, Trilok Soni wrote: > > > > > Hopefully, this thread can give all details about threaded irq discussion. > > > > > http://lkml.org/lkml/2009/2/27/255 > > > > Yes, I'm aware of that - I read it at the time. It seemed to peter out > > without any satisfactory solution, unfortunately. There's two separate > > issues here: > > > > - Ordinary devices on interrupt driven or slow buses like I2C. These > > need something along the lines of request_threaded_irq() that's allows > > them to schedule the main IRQ handler outside hardirq context so > > that they can interact with the device. They need to do something in > > hardirq context to disable the interrupt if it's level triggered but > > most of the time the only option they've got is to disable the IRQ > > and reenable it when the worker thread is done. This is the issue > > here. There is already a sane solution to the problem: See http://lkml.org/lkml/2009/7/17/174 > > My immediate thought when I noticed this was that we should probably > > fix request_threaded_irq() so that it's useful for them; I'd been > > intending to do some digging and try to understand why it is > > currently implemented as it is. What's to fix there ? > > - Multi-function devices like the twl4030 which have an interrupt > > controller on them and would like to expose that interrupt controller > > via the generic IRQ subsystem. This was a large part of the > > discussion in the thread above is a much trickier problem. Why ? > > I've added the folks from Samsung posting the MELFAS MCS-5000 driver to > > the thread since they're running into the same issue. > > > > Let's also add Thomas and David since I believe they worked on the > feature. > > >From my part I would like to have the threaded IRQ available to all > drivers since it seens to be hanlding driver shutdown cleanly and > without races which is a big plus for me since very few drivers get it > right. :) Thanks, tglx -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
