linux-kernel - Re: [PATCH v2 07/10] of/irq: Propagate errors in of_irq_to_resource

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Date:	Mon, 23 Sep 2013 10:36:06 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Rob Herring <rob.herring@...xeda.com>,
	Grant Likely <grant.likely@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Russell King <linux@....linux.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, linux-mips@...ux-mips.org,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	sparclinux@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 07/10] of/irq: Propagate errors in
 of_irq_to_resource_table()

On Sun, Sep 22, 2013 at 04:08:26PM -0500, Rob Herring wrote:
> On Wed, Sep 18, 2013 at 8:24 AM, Thierry Reding
> <thierry.reding@...il.com> wrote:
> > Now that all helpers return precise error codes, this function can
> > propagate these errors to the caller properly.
> >
> > Signed-off-by: Thierry Reding <treding@...dia.com>
> > ---
> > Changes in v2:
> > - return 0 on success or a negative error code on failure
> > - convert callers to new calling convention
> 
> [snip]
> 
> > diff --git a/drivers/of/irq.c b/drivers/of/irq.c
> > index e4f38c0..6d7f824 100644
> > --- a/drivers/of/irq.c
> > +++ b/drivers/of/irq.c
> > @@ -397,18 +397,20 @@ int of_irq_count(struct device_node *dev)
> >   * @res: array of resources to fill in
> >   * @nr_irqs: the number of IRQs (and upper bound for num of @res elements)
> 
> You are effectively changing this to require an exact match rather
> than an upper bound. That seems to be okay since that is what all the
> callers want, but the documentation should be updated.

Done.

> >   *
> > - * Returns the size of the filled in table (up to @nr_irqs).
> > + * Returns 0 on success or a negative error code on failure.
> >   */
> >  int of_irq_to_resource_table(struct device_node *dev, struct resource *res,
> >                 int nr_irqs)
> >  {
> > -       int i;
> > +       int i, ret;
> >
> > -       for (i = 0; i < nr_irqs; i++, res++)
> > -               if (!of_irq_to_resource(dev, i, res))
> 
> The error handling here needs to be updated in the previous patch.

Yes, you're right.

Thanks,
Thierry

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