Re: [GIT PATCH] more Driver core patches for 2.6.19
From: Linus Torvalds
Date: Wed Dec 13 2006 - 15:12:31 EST
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)
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.
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.
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