linux-kernel - Re: [RFC PATCH] add pci_{request,free}

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Date:	Tue, 3 Oct 2006 20:59:26 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Frederik Deweerdt <deweerdt@...e.fr>, linux-kernel@...r.kernel.org,
	arjan@...radead.org, alan@...rguk.ukuu.org.uk, akpm@...l.org,
	rdunlap@...otime.net, gregkh@...e.de
Subject: Re: [RFC PATCH] add pci_{request,free}_irq take #2

On Tue, Oct 03, 2006 at 06:37:12PM -0400, Jeff Garzik wrote:
> Frederik Deweerdt wrote:
> >My bad, I've mixed your proposal and Matthew's, isn't this just a
> >matter of:
> >s/ARCH_VALIDATE_PCI_IRQ/ARCH_VALIDATE_IRQ/ ?
> >
> >I'll look if there's some non-PCI code that might check the irq's value
> >and thus might benefit from this.
> 
> The irq value comes from the PCI subsystem...  The PCI subsystem should 
> validate it.

That's not true.  The value in the pci_dev->irq field has been changed
by the architecture.  See, for example, pci_read_irq_line() in
arch/powerpc/kernel/pci_32.c.  It's a Linux IRQ number, not a PCI IRQ
number.
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