linux-kernel - Re: [PATCH -next] irqchip/exiu: Fix return value check in exiu

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Date:   Tue, 14 Nov 2017 09:55:46 +0000
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Wei Yongjun <weiyongjun1@...wei.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] irqchip/exiu: Fix return value check in exiu_init()

On 14 November 2017 at 06:57, Wei Yongjun <weiyongjun1@...wei.com> wrote:
> In case of error, the function of_iomap() returns NULL pointer not
> ERR_PTR(). The IS_ERR() test in the return value check should be
> replaced with NULL test.
>
> Fixes: 706cffc1b912 ("irqchip/exiu: Add support for Socionext Synquacer EXIU controller")
> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
> ---
>  drivers/irqchip/irq-sni-exiu.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/irqchip/irq-sni-exiu.c b/drivers/irqchip/irq-sni-exiu.c
> index 1b6e2f7..1927b2f 100644
> --- a/drivers/irqchip/irq-sni-exiu.c
> +++ b/drivers/irqchip/irq-sni-exiu.c
> @@ -196,8 +196,8 @@ static int __init exiu_init(struct device_node *node,
>         }
>
>         data->base = of_iomap(node, 0);
> -       if (IS_ERR(data->base)) {
> -               err = PTR_ERR(data->base);
> +       if (!data->base) {
> +               err = -ENODEV;
>                 goto out_free;
>         }
>

I was going to blame Marc's Tegra code for this, because that is where
I copied most of the code from, but the bug doesn't exist there, and
so it appears to be an original work. Oops.

Acked-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>