linux-kernel - Re: [PATCH 3/7] omapfb: fix error return code

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Message-ID: <56824CFD.9000903@ti.com>
Date:	Tue, 29 Dec 2015 11:06:05 +0200
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Julia Lawall <Julia.Lawall@...6.fr>
CC:	<kernel-janitors@...r.kernel.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	<linux-omap@...r.kernel.org>, <linux-fbdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/7] omapfb: fix error return code


On 26/12/15 17:28, Julia Lawall wrote:
> Return a negative error code on failure.
> 
> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> identifier ret; expression e1,e2;
> @@
> (
> if (\(ret < 0\|ret != 0\))
>  { ... return ret; }
> |
> ret = 0
> )
> ... when != ret = e1
>     when != &ret
> *if(...)
> {
>   ... when != ret = e2
>       when forall
>  return ret;
> }
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> 
> ---
>  drivers/video/fbdev/omap2/omapfb/displays/encoder-tpd12s015.c |   12 +++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/video/fbdev/omap2/omapfb/displays/encoder-tpd12s015.c b/drivers/video/fbdev/omap2/omapfb/displays/encoder-tpd12s015.c
> index 677e254..fc4cfa9 100644
> --- a/drivers/video/fbdev/omap2/omapfb/displays/encoder-tpd12s015.c
> +++ b/drivers/video/fbdev/omap2/omapfb/displays/encoder-tpd12s015.c
> @@ -241,22 +241,28 @@ static int tpd_probe(struct platform_device *pdev)
>  
>  	gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
>  		GPIOD_OUT_LOW);
> -	if (IS_ERR(gpio))
> +	if (IS_ERR(gpio)) {
> +		r = PTR_ERR(gpio);
>  		goto err_gpio;
> +	}
>  
>  	ddata->ct_cp_hpd_gpio = gpio;
>  
>  	gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
>  		GPIOD_OUT_LOW);
> -	if (IS_ERR(gpio))
> +	if (IS_ERR(gpio)) {
> +		r = PTR_ERR(gpio);
>  		goto err_gpio;
> +	}
>  
>  	ddata->ls_oe_gpio = gpio;
>  
>  	gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
>  		GPIOD_IN);
> -	if (IS_ERR(gpio))
> +	if (IS_ERR(gpio)) {
> +		r = PTR_ERR(gpio);
>  		goto err_gpio;
> +	}
>  
>  	ddata->hpd_gpio = gpio;

Thanks. Looks like recent changes to the driver break the error
handling. I'll just drop those patches from my for-next branch, and let
the author fix the patches.

 Tomi


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