linux-kernel - Re: [PATCH 1/5] regmap: return ERR_PTR instead of NULL in regmap

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Message-ID: <20111114154411.GA12690@opensource.wolfsonmicro.com>
Date:	Mon, 14 Nov 2011 15:44:11 +0000
From:	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] regmap: return ERR_PTR instead of NULL in
	regmap_init

On Mon, Nov 14, 2011 at 10:40:15AM +0100, Lars-Peter Clausen wrote:
> The regmap_init documentation states that it will either return a pointer to a
> valid regmap structure or a ERR_PTR in case of an error. Currently it returns a
> NULL pointer in case no bus or no config was given. Since NULL is not a
> ERR_PTR a caller might assume that it is a pointer to a valid regmap structure,
> so return a ERR_PTR(-EINVAL) instead.
> 
> Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
> ---
>  drivers/base/regmap/regmap.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
> index b08df85..b84ebf9 100644
> --- a/drivers/base/regmap/regmap.c
> +++ b/drivers/base/regmap/regmap.c
> @@ -139,7 +139,7 @@ struct regmap *regmap_init(struct device *dev,
>  	int ret = -EINVAL;
>  
>  	if (!bus || !config)
> -		return NULL;
> +		goto err;
>  
>  	map = kzalloc(sizeof(*map), GFP_KERNEL);
>  	if (map == NULL) {
> -- 
> 1.7.7.1
> 
> 

Acked-by: Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
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