netdev - Re: MSI interrupts and disable

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Date:	Sun, 14 Oct 2007 12:55:18 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Manfred Spraul" <manfred@...orfullife.com>
Cc:	"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, Manfred Spraul <manfred@...orfullife.com> 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?

in nv_request_irq
                if ((ret = pci_enable_msi(np->pci_dev)) == 0) {
                        np->msi_flags |= NV_MSI_ENABLED;
                        if (request_irq(np->pci_dev->irq, handler,
IRQF_SHARED, dev->name, dev) != 0) {

in request_irq

int request_irq(unsigned int irq, irq_handler_t handler,
                unsigned long irqflags, const char *devname, void *dev_id)
...
        action->dev_id = dev_id;
...
        retval = setup_irq(irq, action);

in setup_irq
int setup_irq(unsigned int irq, struct irqaction *new)
....
        new->irq = irq;

it seems I missed that here new is irqaction instead of net_dev.

YH
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