linux-kernel - Re: [PATCH] spi: davinci: Fix compilation warning.

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Message-ID: <CAMuHMdU-o1zw5ETY3d7tV4kQ7K5wf4KuPBhZL3akQwiKj3+cHQ@mail.gmail.com>
Date:   Mon, 5 Jun 2017 15:07:31 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arvind Yadav <arvind.yadav.cs@...il.com>
Cc:     Murali Karicheri <m-karicheri2@...com>,
        Mark Brown <broonie@...nel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] spi: davinci: Fix compilation warning.

Hi Arvind,

On Mon, Jun 5, 2017 at 2:14 PM, Arvind Yadav <arvind.yadav.cs@...il.com> wrote:
> If CONFIG_OF is disable, it'll through compilation warning.
>
> drivers/spi/spi-davinci.c: In function ‘spi_davinci_get_pdata’:
> drivers/spi/spi-davinci.c:880:2: warning: return makes pointer from integer without a cast [enabled by default]
>   return -ENODEV;
>
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
> ---
>  drivers/spi/spi-davinci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c
> index 2b0805d..93a4009 100644
> --- a/drivers/spi/spi-davinci.c
> +++ b/drivers/spi/spi-davinci.c
> @@ -877,7 +877,7 @@ static int spi_davinci_get_pdata(struct platform_device *pdev,
>         *spi_davinci_get_pdata(struct platform_device *pdev,
>                 struct davinci_spi *dspi)
>  {
> -       return -ENODEV;
> +       return ERR_PTR(-ENODEV);
>  }
>  #endif

And you don't get a warning for spi_davinci_probe() doing

    int ret;

    ret = spi_davinci_get_pdata(pdev, dspi);

?

spi_davinci_get_pdata() returns int if CONFIG_OF, else a pointer.
I guess it always should return int instead.

It's been like this since the function was introduced, in commit
aae7147dfc522062 ("spi/davinci: add OF support for the spi controller").

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds