Re: [PATCH] starfire reads irq before pci_enable_device.

[Jeff Garzik <jgarzik@mandrakesoft.com>]

Manfred Spraul wrote:
> 
> Jeff Garzik wrote:
> >
> > +       SET_MODULE_OWNER(dev);
> >
> >         irq = pdev->irq;
> >
> 
> One question:
> The code copies 'pdev->irq' into 'dev->irq'.
> 
> Is that required, who need 'dev->irq'?
> 
> > retval = request_irq(dev->irq, &intr_handler, SA_SHIRQ, dev->name, dev);
> 
> Can't the driver use?
>  retval = request_irq(np->pci_dev->irq)

Sure it can.  A PCI driver can completely ignore dev->irq, if it so
desires.  However...

Setting dev->irq is really a courtesy, because while the net core code
doesn't use it at all, it is reported to userspace such as ifconfig. 
And because the netdev setup code could potentially assign a value to
dev->irq on its own, if the driver does -not- set dev->irq, the value
reported to userspace might incorrect instead of just being zero.

[side note - ifconfig only obtains the lower 16 bits of the
dev->base_addr value, grump grump]

	Jeff


-- 
Jeff Garzik       | "You see, in this world there's two kinds of
Building 1024     |  people, my friend: Those with loaded guns
MandrakeSoft      |  and those who dig. You dig."  --Blondie
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/