linux-kernel - Re: [PATCH v2 04/10] irqdomain: Return errors from irq_create_of

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Message-ID: <CAL_JsqLQeAQD460f8Lk9eDE2dCzLusC1mXZ-_uaKVFLfhJNryg@mail.gmail.com>
Date:	Sun, 22 Sep 2013 16:14:43 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Thierry Reding <thierry.reding@...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>,
	linux-mips@...ux-mips.org, Russell King <linux@....linux.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>, sparclinux@...r.kernel.org,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 04/10] irqdomain: Return errors from irq_create_of_mapping()

On Wed, Sep 18, 2013 at 8:24 AM, Thierry Reding
<thierry.reding@...il.com> wrote:
> Instead of returning 0 for all errors, allow the precise error code to
> be propagated. This will be used in subsequent patches to allow further
> propagation of error codes.
>
> The interrupt number corresponding to the new mapping is returned in an
> output parameter so that the return value is reserved to signal success
> (== 0) or failure (< 0).
>
> Signed-off-by: Thierry Reding <treding@...dia.com>

One comment below, otherwise:

Acked-by: Rob Herring <rob.herring@...xeda.com>

> diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
> index 905a24b..ae71b14 100644
> --- a/arch/powerpc/kernel/pci-common.c
> +++ b/arch/powerpc/kernel/pci-common.c
> @@ -230,6 +230,7 @@ static int pci_read_irq_line(struct pci_dev *pci_dev)
>  {
>         struct of_irq oirq;
>         unsigned int virq;
> +       int ret;
>
>         pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev));
>
> @@ -266,8 +267,10 @@ static int pci_read_irq_line(struct pci_dev *pci_dev)
>                          oirq.size, oirq.specifier[0], oirq.specifier[1],
>                          of_node_full_name(oirq.controller));
>
> -               virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
> -                                            oirq.size);
> +               ret = irq_create_of_mapping(oirq.controller, oirq.specifier,
> +                                           oirq.size, &virq);
> +               if (ret)
> +                       virq = NO_IRQ;
>         }
>         if(virq == NO_IRQ) {
>                 pr_debug(" Failed to map !\n");

Can you get rid of NO_IRQ usage here instead of adding to it.

Rob
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