linux-kernel - Re: [PATCH 2/6] drivers/net/can/softing/softing_main.c: ensure a consistent return value in error case

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Message-ID: <5003C3F1.4050900@pengutronix.de>
Date:	Mon, 16 Jul 2012 09:34:09 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Julia Lawall <Julia.Lawall@...6.fr>
CC:	Wolfgang Grandegger <wg@...ndegger.com>,
	kernel-janitors@...r.kernel.org, linux-can@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] drivers/net/can/softing/softing_main.c: ensure a
 consistent return value in error case

On 07/14/2012 06:43 PM, Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@...6.fr>
> 
> Typically, the return value desired for the failure of a function with an
> integer return value is a negative integer.  In these cases, the return
> value is sometimes a negative integer and sometimes 0, due to a subsequent
> initialization of the return variable within the loop.
> 
> A simplified version of the semantic match that finds this problem is:
> (http://coccinelle.lip6.fr/)
> 
> //<smpl>
> @r exists@
> identifier ret;
> position p;
> constant C;
> expression e1,e3,e4;
> statement S;
> @@
> 
> ret = -C
> ... when != ret = e3
>     when any
> if@p (...) S
> ... when any
> if (\(ret != 0\|ret < 0\|ret > 0\) || ...) { ... return ...; }
> ... when != ret = e3
>     when any
> *if@p (...)
> {
>   ... when != ret = e4
>   return ret;
> }
> //</smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

Thanks, applied to can-next

Marc
> 
> ---
>  drivers/net/can/softing/softing_main.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/can/softing/softing_main.c b/drivers/net/can/softing/softing_main.c
> index a7c77c7..f2a221e 100644
> --- a/drivers/net/can/softing/softing_main.c
> +++ b/drivers/net/can/softing/softing_main.c
> @@ -826,12 +826,12 @@ static __devinit int softing_pdev_probe(struct platform_device *pdev)
>  		goto sysfs_failed;
>  	}
>  
> -	ret = -ENOMEM;
>  	for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
>  		card->net[j] = netdev =
>  			softing_netdev_create(card, card->id.chip[j]);
>  		if (!netdev) {
>  			dev_alert(&pdev->dev, "failed to make can[%i]", j);
> +			ret = -ENOMEM;
>  			goto netdev_failed;
>  		}
>  		priv = netdev_priv(card->net[j]);
> 
> --
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