linux-kernel - Re: [PATCH] nvmem: fix nvmem_cell_read() return type for !CONFIG

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Date:	Wed, 8 Jun 2016 09:40:11 -0700
From:	Brian Norris <briannorris@...omium.org>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	linux-kernel@...r.kernel.org,
	Brian Norris <computersforpeace@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH] nvmem: fix nvmem_cell_read() return type for
 !CONFIG_NVMEM

On Wed, Jun 08, 2016 at 09:26:46AM -0700, Brian Norris wrote:
> With CONFIG_NVMEM, nvmem_cell_read() returns void *. With !CONFIG_NVMEM
> it returns char *. Let's make that consistent. Also drop the
> incorrect/inconsistent comment about char * above the nvmem_cell_read()
> definition.
> 
> drivers/thermal/mtk_thermal.c is already working around this by casting
> to (u32 *).
> 
> Signed-off-by: Brian Norris <briannorris@...omium.org>

Seems Guenter submitted the same thing a week ago, with no response:

https://patchwork.kernel.org/patch/9148325/

I'll selfishly suggest that mine is better, since it also corrects the
comments :)

Brian

> ---
>  drivers/nvmem/core.c           | 4 ++--
>  include/linux/nvmem-consumer.h | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index 965911d9b36a..398ea7f54826 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -981,8 +981,8 @@ static int __nvmem_cell_read(struct nvmem_device *nvmem,
>   * @cell: nvmem cell to be read.
>   * @len: pointer to length of cell which will be populated on successful read.
>   *
> - * Return: ERR_PTR() on error or a valid pointer to a char * buffer on success.
> - * The buffer should be freed by the consumer with a kfree().
> + * Return: ERR_PTR() on error or a valid pointer to a buffer on success. The
> + * buffer should be freed by the consumer with a kfree().
>   */
>  void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len)
>  {
> diff --git a/include/linux/nvmem-consumer.h b/include/linux/nvmem-consumer.h
> index 9bb77d3ed6e0..c2256d746543 100644
> --- a/include/linux/nvmem-consumer.h
> +++ b/include/linux/nvmem-consumer.h
> @@ -74,7 +74,7 @@ static inline void nvmem_cell_put(struct nvmem_cell *cell)
>  {
>  }
>  
> -static inline char *nvmem_cell_read(struct nvmem_cell *cell, size_t *len)
> +static inline void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len)
>  {
>  	return ERR_PTR(-ENOSYS);
>  }
> -- 
> 2.8.0.rc3.226.g39d4020
>