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

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Message-Id: <1166044471.11914.195.camel@localhost.localdomain>
Date:	Thu, 14 Dec 2006 08:14:31 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Greg KH <gregkh@...e.de>, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [GIT PATCH] more Driver core patches for 2.6.19

> 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!

Actually, you can... but wether you want is a different story :-)

You can simply mask it, have it handled by userspace and re-enable it
when that's done. Though say hello to horrible interrupt latencies and
hope you aren't sharing it with anything critical...

I don't mean I -like- the approach... I just say it can be made to
sort-of work. But I don't see the point.

Ben.

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