Subject: Re: [GIT PATCH] more Driver core patches for 2.6.19
From: Thomas Gleixner <tglx@linutronix.de>
Reply-To: tglx@linutronix.de
To: Alan <alan@lxorguk.ukuu.org.uk>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       Linus Torvalds <torvalds@osdl.org>, Greg KH <gregkh@suse.de>,
       Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
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Date: Thu, 14 Dec 2006 10:15:41 +0100
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On Wed, 2006-12-13 at 23:56 +0000, Alan wrote:
> On Wed, 13 Dec 2006 23:30:55 +0100
> Thomas Gleixner <tglx@linutronix.de> wrote:
> 
> > - IRQ happens
> > - kernel handler runs and masks the chip irq, which removes the IRQ
> > request
> 
> 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 ?

	tglx


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