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

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Date:	Thu, 14 Dec 2006 11:33:11 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	tglx@...utronix.de
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linus Torvalds <torvalds@...l.org>, 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

> > IRQ is shared with the disk driver, box dead.
> 
> Err ? 
> 
> IRQ happens
> 
> IRQ is disabled by the generic handling code
> 
> Handler is invoked and checks, whether the irq is from the device or
> not. 
>  - If not, it returns IRQ_NONE, so the next driver (e.g. disk) is
> invoked.
>  - If yes, it masks the chip on the device, which disables the chip
> interrupt line and returns IRQ_HANDLED.
> 
> In both cases the IRQ gets reenabled from the generic irq handling code
> on return, so why is the box dead ?

I wrote this before your "generic" layer was in fact explained further to
not be generic at all and involve a new driver for each device. Your
original explanation was not clear.

Alan
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