Re: [DRIVER CORE] platform_get_irq*(): return NO_IRQ on error

[Greg KH <gregkh@suse.de>]

On Thu, Jan 05, 2006 at 06:03:10PM +0000, David Vrabel wrote:
> Greg KH wrote:
> > On Thu, Jan 05, 2006 at 05:11:42PM +0000, David Vrabel wrote:
> > 
> >>platform_get_irq*() cannot return 0 on error as 0 is a valid IRQ on some
> >>platforms, return NO_IRQ (-1) instead.
> >>
> >>Signed-off-by: David Vrabel <dvrabel@arcom.com>
> >>
> >>--- linux-2.6-working.orig/drivers/base/platform.c	2006-01-05 16:49:23.000000000 +0000
> >>+++ linux-2.6-working/drivers/base/platform.c	2006-01-05 17:10:18.000000000 +0000
> >>@@ -59,7 +59,7 @@
> >> {
> >> 	struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
> >> 
> >>-	return r ? r->start : 0;
> >>+	return r ? r->start : NO_IRQ;
> > 
> > 
> > No, I think the whole NO_IRQ stuff has been given up on, see the lkml
> > archives for details.
> 
> Now that you mention it I remember that thread[1].
> 
> How about returning -ENXIO (or similar) then?

That would be fine as long as you fix up all callers to not pass that
value to request_irq() :)

thanks,

greg k-h