Re: [GIT PATCH] more Driver core patches for 2.6.19



On Wed, 13 Dec 2006, Greg KH wrote:

- userspace io driver interface added. This allows the ability
to write userspace drivers for some types of hardware much
easier than before, going through a simple interface to get
accesses to irqs and memory regions. A small kernel portion
is still needed to handle the irq properly, but that is it.

Ok, what kind of ass-hat idiotic thing is this?

irqreturn_t uio_irq_handler(int irq, void *dev_id)
{
return IRQ_HANDLED;
}

exactly what is the point here? No way will I pull this kind of crap. You
just seem to have guaranteed a dead machine if the irq is level-triggered,
since it will keep on happening forever.

Please remove.

YOU CANNOT DO IRQ'S BY LETTING USER SPACE SORT IT OUT!

It's really that easy. The irq handler has to be _entirely_ in kernel
space. No user-space ass-hattery here.

And I don't care one whit if it happens to work on parport with an old
legacy ISA interrupt that is edge-triggered. That's not even the
interesting case. Never will be.

NAK NAK NAK NAK.

Linus
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