linux-kernel - Re: [PATCH v2] gpio: interrupt consistency check for OF GPIO IRQs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <201308261256.00870.poeschel@lemonage.de>
Date:	Mon, 26 Aug 2013 12:56:00 +0200
From:	Lars Poeschel <poeschel@...onage.de>
To:	Andreas Larsson <andreas@...sler.com>
Cc:	Lars Poeschel <larsi@....tu-dresden.de>, grant.likely@...aro.org,
	linus.walleij@...aro.org, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	mark.rutland@....com, ian.campbell@...rix.com,
	galak@...eaurora.org, pawel.moll@....com, tomasz.figa@...il.com,
	swarren@...dotorg.org,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Enric Balletbo i Serra <eballetbo@...il.com>,
	"Jean-Christophe PLAGNIOL-VILLARD" <plagnioj@...osoft.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Kevin Hilman <khilman@...aro.org>,
	Balaji T K <balajitk@...com>,
	Tony Lindgren <tony@...mide.com>,
	Jon Hunter <jgchunter@...il.com>
Subject: Re: [PATCH v2] gpio: interrupt consistency check for OF GPIO IRQs

Hi Andreas!

On Thursday 22 August 2013 at 15:16:18, Andreas Larsson wrote:
> On 2013-08-21 15:38, Lars Poeschel wrote:
> > +static void of_gpio_scan_irq_lines(const struct device_node *const
> > node, +				   struct device_node *const gcn,
> > +				   struct irq_domain *const irq_domain,
> > +				   const u32 intsize,
> > +				   const struct gpio_chip * const gc,
> > +				   bool request)
> > +{
> > +	struct device_node *child;
> > +	struct device_node *irq_parent;
> > +	const __be32 *intspec;
> > +	u32 intlen;
> > +	int ret;
> > +	int i;
> > +	irq_hw_number_t hwirq;
> > +	unsigned int type;
> > +
> > +	if (node == NULL)
> > +		return;
> > +
> > +	for_each_child_of_node(node, child) {
> > +		of_gpio_scan_irq_lines(child, gcn, irq_domain, intsize, gc,
> > +				       request);
> > +		/* Check if we have an IRQ parent, else continue */
> > +		irq_parent = of_irq_find_parent(child);
> 
> Hi!
> 
> This call to of_irq_find_parent breaks gpiolib-of for SPARC due to the
> fact that the function is undefined when !defined(CONFIG_OF_IRQ) &&
> defined(CONFIG_OF).
> 
> Defining the empty of_irq_find_parent in include/linux/of_irq.h when
> !defined(CONFIG_OF_IRQ) instead of the current case when
> !defined(CONFIG_OF) would solve the immediate compilation problem.

Is this a bug and should be fixed ?

> However, when !defined(CONFIG_OF_IRQ) (i.e. SPARC in this case) the
> whole tree walking will never accomplish anything, so it would be good
> if of_gpiochip_reserve_irq_lines is just an empty dummy or something
> like that when !defined(CONFIG_OF_IRQ).

You are right. I'll consider this in the next spin.

Thanks,
Lars
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/