linux-kernel - Re: MSI interrupts and disable

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Message-ID: <86802c440710141615g60fb9775oba590deb1a9fabde@mail.gmail.com>
Date:	Sun, 14 Oct 2007 16:15:46 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	benh@...nel.crashing.org
Cc:	"Manfred Spraul" <manfred@...orfullife.com>,
	"Jeff Garzik" <jgarzik@...ox.com>,
	"Ayaz Abdulla" <aabdulla@...dia.com>,
	nedev <netdev@...r.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"David Miller" <davem@...emloft.net>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: MSI interrupts and disable_irq

On 10/14/07, Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:
>
> On Sun, 2007-10-14 at 09:15 +0200, Manfred Spraul wrote:
> > Yinghai Lu wrote:
> > > On 10/13/07, Manfred Spraul <manfred@...orfullife.com> wrote:
> > >
> > >> Someone around with a MSI capable board? The forcedeth driver does
> > >>     dev->irq = pci_dev->irq
> > >> in nv_probe(), especially before pci_enable_msi().
> > >> Does pci_enable_msi() change pci_dev->irq? Then we would disable the
> > >> wrong interrupt....
> > >>
> > >
> > > the request_irq==>setup_irq will make dev->irq = pci_dev->irq.
> > >
> > >
> > Where is that?
> > Otherwise I would propose the attached patch. My board is not
> > MSI-capable, thus I can't test it myself.
>
> Why not just copy pcidev->irq to dev->irq once ?

it seems e1000 is using np->pci_dev->irq directly too.

YH
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