linux-kernel - Re: [PATCH] drivers/regulator: use PTR

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Date:	Sat, 21 Nov 2009 21:33:25 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Julia Lawall <julia@...u.dk>
Cc:	Liam Girdwood <lrg@...mlogic.co.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] drivers/regulator: use PTR_ERR to get error code

On 21 Nov 2009, at 21:18, Julia Lawall <julia@...u.dk> wrote:

> From: Julia Lawall <julia@...u.dk>
>
> IS_ERR returns only 1 or 0.  The callsite of setup_regulators  
> expects a
> negative integer in an error case.  Thus, PTR_ERR has to be used to  
> extract
> it.
>
> The semantic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
>
> // <smpl>
> @@
> expression E,E1;
> @@
>
> *E = IS_ERR(...)
> ... when != E = E1
> *return E;
> // </smpl>
>
> Signed-off-by: Julia Lawall <julia@...u.dk>

Acked-by: <broonie@...nsource.wolfsonmicro.com>

>
> ---
> drivers/regulator/lp3971.c          |    4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/regulator/lp3971.c b/drivers/regulator/lp3971.c
> index 7803a32..76d08c2 100644
> --- a/drivers/regulator/lp3971.c
> +++ b/drivers/regulator/lp3971.c
> @@ -446,8 +446,8 @@ static int setup_regulators(struct lp3971 *lp3971,
>        lp3971->rdev[i] = regulator_register(&regulators[id],
>            lp3971->dev, pdata->regulators[i].initdata, lp3971);
>
> -        err = IS_ERR(lp3971->rdev[i]);
> -        if (err) {
> +        if (IS_ERR(lp3971->rdev[i])) {
> +            err = PTR_ERR(lp3971->rdev[i]);
>            dev_err(lp3971->dev, "regulator init failed: %d\n",
>                err);
>            goto error;
--
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