linux-kernel - Re: [PATCH 1/2] nvmem: core: add nvmem_cell_read

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Date:   Wed, 5 Feb 2020 19:50:50 +0800
From:   Frank Lee <tiny.windzz@...il.com>
To:     Srini Kandagatla <srinivas.kandagatla@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] nvmem: core: add nvmem_cell_read_common

ping...

On Mon, Jan 27, 2020 at 3:56 AM Yangtao Li <tiny.windzz@...il.com> wrote:
>
> Now there are nvmem_cell_read_u16 and nvmem_cell_read_u32.
> They are very similar, let's strip out a common part.
>
> And use nvmem_cell_read_common to simplify their implementation.
>
> Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> ---
>  drivers/nvmem/core.c | 54 ++++++++++++++++----------------------------
>  1 file changed, 19 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index 9f1ee9c766ec..f4226546e49a 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -1071,16 +1071,8 @@ int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len)
>  }
>  EXPORT_SYMBOL_GPL(nvmem_cell_write);
>
> -/**
> - * nvmem_cell_read_u16() - Read a cell value as an u16
> - *
> - * @dev: Device that requests the nvmem cell.
> - * @cell_id: Name of nvmem cell to read.
> - * @val: pointer to output value.
> - *
> - * Return: 0 on success or negative errno.
> - */
> -int nvmem_cell_read_u16(struct device *dev, const char *cell_id, u16 *val)
> +static int nvmem_cell_read_common(struct device *dev, const char *cell_id,
> +                                 void *val, size_t count)
>  {
>         struct nvmem_cell *cell;
>         void *buf;
> @@ -1095,17 +1087,31 @@ int nvmem_cell_read_u16(struct device *dev, const char *cell_id, u16 *val)
>                 nvmem_cell_put(cell);
>                 return PTR_ERR(buf);
>         }
> -       if (len != sizeof(*val)) {
> +       if (len != count) {
>                 kfree(buf);
>                 nvmem_cell_put(cell);
>                 return -EINVAL;
>         }
> -       memcpy(val, buf, sizeof(*val));
> +       memcpy(val, buf, count);
>         kfree(buf);
>         nvmem_cell_put(cell);
>
>         return 0;
>  }
> +
> +/**
> + * nvmem_cell_read_u16() - Read a cell value as an u16
> + *
> + * @dev: Device that requests the nvmem cell.
> + * @cell_id: Name of nvmem cell to read.
> + * @val: pointer to output value.
> + *
> + * Return: 0 on success or negative errno.
> + */
> +int nvmem_cell_read_u16(struct device *dev, const char *cell_id, u16 *val)
> +{
> +       return nvmem_cell_read_common(dev, cell_id, val, sizeof(*val));
> +}
>  EXPORT_SYMBOL_GPL(nvmem_cell_read_u16);
>
>  /**
> @@ -1119,29 +1125,7 @@ EXPORT_SYMBOL_GPL(nvmem_cell_read_u16);
>   */
>  int nvmem_cell_read_u32(struct device *dev, const char *cell_id, u32 *val)
>  {
> -       struct nvmem_cell *cell;
> -       void *buf;
> -       size_t len;
> -
> -       cell = nvmem_cell_get(dev, cell_id);
> -       if (IS_ERR(cell))
> -               return PTR_ERR(cell);
> -
> -       buf = nvmem_cell_read(cell, &len);
> -       if (IS_ERR(buf)) {
> -               nvmem_cell_put(cell);
> -               return PTR_ERR(buf);
> -       }
> -       if (len != sizeof(*val)) {
> -               kfree(buf);
> -               nvmem_cell_put(cell);
> -               return -EINVAL;
> -       }
> -       memcpy(val, buf, sizeof(*val));
> -
> -       kfree(buf);
> -       nvmem_cell_put(cell);
> -       return 0;
> +       return nvmem_cell_read_common(dev, cell_id, val, sizeof(*val));
>  }
>  EXPORT_SYMBOL_GPL(nvmem_cell_read_u32);
>
> --
> 2.17.1
>