linux-kernel - Re: MSI interrupts and disable

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Date:	Mon, 15 Oct 2007 09:36:12 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Yinghai Lu <yhlu.kernel@...il.com>
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 Sun, 2007-10-14 at 16:15 -0700, Yinghai Lu wrote:
> 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.

Heh, allright, doesn't matter, I was just proposing to avoid one more
indirection :-)

Ben.


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