Re: IDE IRQ probe brokenness.

From: Alan Cox (
Date: Tue Jun 10 2003 - 11:42:41 EST

On Maw, 2003-06-10 at 09:33, David Woodhouse wrote:
> I have on my desk a machine where all PCI interrupts are routed to
> IRQ 0.
> The IDE code doesn't seem very happy with it -- it seems to think that
> hwif->irq == 0 means that no IRQ has been set. It should be using -1 for
> that instead.
> This error is in both 2.4 and 2.5.

It isn't clear that -1 is safe either. One thing I would suggest for
your latest weird embedded beastie is that you tweak the IRQ assignment
so IRQ 0 disappears or becomes IRQ 63 or something. IDE does have this
problem, but so does USB and a lot of other code.

Basically we need a "NOT_AN_IRQ" value defined either globally or per


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