linux-kernel - Re: [PATCH] drm/tegra: dpaux: Modify error handling

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Date:	Sat, 13 Aug 2016 10:00:19 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Amitoj Kaur Chawla <amitoj1606@...il.com>
cc:	thierry.reding@...il.com, airlied@...ux.ie, swarren@...dotorg.org,
	gnurou@...il.com, dri-devel@...ts.freedesktop.org,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/tegra: dpaux: Modify error handling



On Sat, 13 Aug 2016, Amitoj Kaur Chawla wrote:

> devm_pinctrl_register returns an ERR_PTR in case of error and should
> have an IS_ERR check instead of a null check.
>
> The Coccinelle semantic patch used to make this change is as follows:
> @@
> expression e;
> @@
>
>   e = devm_pinxtrl_register(...);

Actually, there is a typo here.  devm_pinxtrl_register should be
devm_pinctrl_register.

julia

> if(
> -    !e
> +    IS_ERR(e)
>     )
>     {
>   <+...
>   return
> - ...
> + PTR_ERR(e)
>   ;
>   ...+>
>   }
>
> Signed-off-by: Amitoj Kaur Chawla <amitoj1606@...il.com>
> ---
>  drivers/gpu/drm/tegra/dpaux.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c
> index 059f409..2fde44c 100644
> --- a/drivers/gpu/drm/tegra/dpaux.c
> +++ b/drivers/gpu/drm/tegra/dpaux.c
> @@ -539,9 +539,9 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
>  	dpaux->desc.owner = THIS_MODULE;
>
>  	dpaux->pinctrl = devm_pinctrl_register(&pdev->dev, &dpaux->desc, dpaux);
> -	if (!dpaux->pinctrl) {
> +	if (IS_ERR(dpaux->pinctrl)) {
>  		dev_err(&pdev->dev, "failed to register pincontrol\n");
> -		return -ENODEV;
> +		return PTR_ERR(dpaux->pinctrl);
>  	}
>  #endif
>  	/* enable and clear all interrupts */
> --
> 1.9.1
>
>