Subject: Re: [PATCH] ata: Don't use NO_IRQ in pata_of_platform driver

From: Jean-Christophe PLAGNIOL-VILLARD <[email-masked]>
Date: Tue, 6 Dec 2011 07:13:21 +0100

On 18:45 Mon 05 Dec     , Alan Cox wrote:
> > But as you illustrated, there is a large number of drivers that already 
> > assume no IRQ is < 0, even if they don't use any IRQ #0 themselves.  
> > That is a much bigger problem to fix.
> 
> And a much larger number assuming the reverse is true which are hiding
> potential bugs on ARM.
> 
> Looking at the serial stuff the best checks appear to be looking at
> "irq", "-1" and NO_IRQ.
> 
> For migration stuff that's doing broken things like
> 
> 	if (irq < 0)
> 
> can be changed to
> 
> 	if (irq <= 0)
> 
> and that can be done before NO_IRQ itself is nailed on ARM and PA-RISC.
can we sinply introduce a macro irq_is_valid

and make it chip dependant as gpio_is_valid
and then move away from irq 0 valid

so we do not need to brake anthing first and then easly convert them

Best Regards,
J.