linux-kernel - Re: [PATCH v2] iio: adc: exynos5

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Date:	Tue, 12 Mar 2013 09:14:34 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Naveen Krishna Chatradhi <ch.naveen@...sung.com>
Cc:	linux-iio <linux-iio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-samsung-soc@...r.kernel.org, gregkh@...uxfoundation.org,
	Naveen Krishna <naveenkrishna.ch@...il.com>,
	Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [PATCH v2] iio: adc: exynos5_adc: fix compilation warnings

Naveen,

On Wed, Mar 6, 2013 at 7:09 PM, Naveen Krishna Chatradhi
<ch.naveen@...sung.com> wrote:
> -       unsigned int            version;
> +       unsigned int            version;

Given that you've changed exynos_adc_get_version() to return an int,
shouldn't this be an int too (not unsigned)?


> -static inline unsigned int exynos_adc_get_version(struct platform_device *pdev)
> +static inline int exynos_adc_get_version(struct platform_device *pdev)
>  {
>         const struct of_device_id *match;
>
>         match = of_match_node(exynos_adc_match, pdev->dev.of_node);
> -       return (unsigned int)match->data;
> +       return (int)match->data;

Given that you're now checking for an error code below it seems like
you ought to generate one here.  ;)
...AKA: return an error if match is NULL--don't dereference NULL.


>  static int exynos_read_raw(struct iio_dev *indio_dev,
> @@ -117,7 +117,7 @@ static int exynos_read_raw(struct iio_dev *indio_dev,
>                                 long mask)
>  {
>         struct exynos_adc *info = iio_priv(indio_dev);
> -       unsigned long timeout;
> +       int timeout;

Why change this to an "int" when
wait_for_completion_interruptible_timeout() returns a long?  I agree
with the removal of the "unsigned", though.


> +       version = exynos_adc_get_version(pdev);
> +       if (version < 0) {
> +               dev_err(&pdev->dev, "no matching of_node, err = %d\n", version);
> +               ret = version;
> +               goto err_iio;
> +       }
> +
> +       info->version = version;

Optional (and perhaps a matter of preference): I'd eliminate the
"version" variable here and just re-use "ret" for storing the result
of exynos_adc_get_version().


-Doug
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