linux-kernel - Re: [PATCH 2/3] drivers/base: devres.c: Add block copy func. for managed devices

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Date:	Wed, 18 Jun 2014 15:05:58 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Rob Jones <rob.jones@...ethink.co.uk>
Cc:	linus.walleij@...aro.org, gnurou@...il.com, lgirdwood@...il.com,
	broonie@...nel.org, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org, ian.molton@...ethink.co.uk,
	ben.dooks@...ethink.co.uk
Subject: Re: [PATCH 2/3] drivers/base: devres.c: Add block copy func. for managed devices

Am Dienstag, 10. Juni 2014, 15:41:47 schrieb Rob Jones:
> Add function devm_kmemdup().
> Rationalise with devm_kstrdup() to avoid code duplication.
> 
> Reviewed-by: Ian Molton <ian.molton@...ethink.co.uk>
> Signed-off-by: Rob Jones <rob.jones@...ethink.co.uk>
> ---
>  drivers/base/devres.c  |   42 ++++++++++++++++++++++++++++++++++--------
>  include/linux/device.h |    2 ++
>  2 files changed, 36 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/base/devres.c b/drivers/base/devres.c
> index db4e264..978bbe2 100644
> --- a/drivers/base/devres.c
> +++ b/drivers/base/devres.c
> @@ -791,6 +791,20 @@ void * devm_kmalloc(struct device *dev, size_t size,
> gfp_t gfp) EXPORT_SYMBOL_GPL(devm_kmalloc);
> 
>  /**
> + * static function to avoid code duplication when duplicating buffers
> + */
> +static void *devm_kmemdup_nochecks(struct device *dev, const void *s,
> +				    size_t size, gfp_t gfp)
> +{
> +	void *buf;
> +
> +	buf = devm_kmalloc(dev, size, gfp);
> +	if (buf)
> +		memcpy(buf, s, size);
> +	return buf;
> +}
> +
> +/**
>   * devm_kstrdup - Allocate resource managed space and
>   *                copy an existing string into that.
>   * @dev: Device to allocate memory for
> @@ -802,21 +816,33 @@ EXPORT_SYMBOL_GPL(devm_kmalloc);
>   */
>  char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp)
>  {
> -	size_t size;
> -	char *buf;
> -
>  	if (!s)
>  		return NULL;
> 
> -	size = strlen(s) + 1;
> -	buf = devm_kmalloc(dev, size, gfp);
> -	if (buf)
> -		memcpy(buf, s, size);
> -	return buf;
> +	return devm_kmemdup_nochecks(dev, s, (strlen(s)+1), gfp);
>  }
>  EXPORT_SYMBOL_GPL(devm_kstrdup);

hmm, this looks like an unrelated change to me and may warrant a separate 
patch for the devm_kstrdup change.


> 
>  /**
> + * devm_kmemdup - Allocate resource managed space and
> + *                copy existing data into that.
> + * @dev: Device to allocate memory for
> + * @s: the memory block to duplicate
> + * @gfp: the GFP mask used in the devm_kmalloc() call when
> + *       allocating memory
> + * RETURNS:
> + * Pointer to allocated string on success, NULL on failure.
> + */
> +void *devm_kmemdup(struct device *dev, const void *s, size_t size, gfp_t
> gfp) +{
> +	if (!s || (size == 0))
> +		return NULL;
> +
> +	return devm_kmemdup_nochecks(dev, s, size, gfp);
> +}
> +EXPORT_SYMBOL_GPL(devm_kmemdup);
> +
> +/**
>   * devm_kfree - Resource-managed kfree
>   * @dev: Device this memory belongs to
>   * @p: Memory to free
> diff --git a/include/linux/device.h b/include/linux/device.h
> index d1d1c05..7ace116 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -623,6 +623,8 @@ static inline void *devm_kcalloc(struct device *dev,
>  }
>  extern void devm_kfree(struct device *dev, void *p);
>  extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp);
> +extern void *devm_kmemdup(struct device *dev,
> +			  const void *s, size_t size, gfp_t gfp);
> 
>  void __iomem *devm_ioremap_resource(struct device *dev, struct resource
> *res); void __iomem *devm_request_and_ioremap(struct device *dev,

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