linux-kernel - Re: [PATCH 2/2] uio: add an of

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Date:	Sun, 14 Jun 2009 19:14:06 +0200
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	"Hans J. Koch" <hjk@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	devicetree-discuss@...abs.org, Magnus Damm <magnus.damm@...il.com>,
	Greg KH <gregkh@...e.de>
Subject: Re: [PATCH 2/2] uio: add an of_genirq driver

Hello Hans,

> > +	uioinfo->irq = irq_of_parse_and_map(op->node, 0);
> > +	if (!uioinfo->irq)
> > +		uioinfo->irq = UIO_IRQ_NONE;
> 
> Please don't do this. It's inconsistent if all other UIO drivers require
> people to use UIO_IRQ_NONE and you also allow zero. UIO_IRQ_NONE was
> introduced because 0 may be a legal interrupt number on some platforms.

Yes, well, the '0' vs. 'NO_IRQ' thing is still not fully sorted out AFAIK. But
you are possibly right here, as long as irq_of_parse_and_map does return
NO_IRQ, I should explicitly check for it, like this:

	if (uioinfo->irq == NO_IRQ)
		uioinfo->irq = UIO_IRQ_NONE;

> > +/* Match table for of_platform binding */
> > +static const struct of_device_id __devinitconst uio_of_genirq_match[] = {
> 
> checkpatch.pl complains about that. Please check.

Did that, it is a false positive. See here:

http://lkml.indiana.edu/hypermail/linux/kernel/0906.1/02780.html

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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