linux-kernel - Re: [PATCH v2 06/20] nvmem: core: add nvmem_add_one

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Date:   Fri, 9 Sep 2022 09:52:12 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Michael Walle <michael@...le.cc>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Frank Rowand <frowand.list@...il.com>
Cc:     linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Ahmad Fatoum <a.fatoum@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [PATCH v2 06/20] nvmem: core: add nvmem_add_one_cell()



On 01/09/2022 23:18, Michael Walle wrote:
> Add a new function to add exactly one cell. This will be used by the
> nvmem layout drivers to add custom cells. In contrast to the
> nvmem_add_cells(), this has the advantage that we don't have to assemble
> a list of cells on runtime.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
> changes since v1:
>   - none
> 
>   drivers/nvmem/core.c           | 58 ++++++++++++++++++++--------------
>   include/linux/nvmem-provider.h |  8 +++++
>   2 files changed, 42 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index be38e62fd190..3dfd149374a8 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -501,6 +501,35 @@ static int nvmem_cell_info_to_nvmem_cell_entry(struct nvmem_device *nvmem,
>   	return 0;
>   }
>   
> +/**
> + * nvmem_add_one_cell() - Add one cell information to an nvmem device
> + *
> + * @nvmem: nvmem device to add cells to.
> + * @info: nvmem cell info to add to the device
> + *
> + * Return: 0 or negative error code on failure.
> + */
> +int nvmem_add_one_cell(struct nvmem_device *nvmem,
> +		       const struct nvmem_cell_info *info)
> +{
> +	struct nvmem_cell_entry *cell;
> +	int rval;
> +
> +	cell = kzalloc(sizeof(*cell), GFP_KERNEL);
> +	if (!cell)
> +		return -ENOMEM;
> +
> +	rval = nvmem_cell_info_to_nvmem_cell_entry(nvmem, info, cell);
> +	if (rval) {
> +		kfree(cell);
> +		return rval;
> +	}
> +
> +	nvmem_cell_entry_add(cell);
> +
> +	return 0;
> +}
> +

EXPORT_SYMBOL_GPL ???

>   /**
>    * nvmem_add_cells() - Add cell information to an nvmem device
>    *
> @@ -514,34 +543,15 @@ static int nvmem_add_cells(struct nvmem_device *nvmem,
>   		    const struct nvmem_cell_info *info,
>   		    int ncells)
>   {
> -	struct nvmem_cell_entry **cells;
> -	int i, rval = 0;
> -
> -	cells = kcalloc(ncells, sizeof(*cells), GFP_KERNEL);
> -	if (!cells)
> -		return -ENOMEM;
> +	int i, rval;
>   
>   	for (i = 0; i < ncells; i++) {
> -		cells[i] = kzalloc(sizeof(**cells), GFP_KERNEL);
> -		if (!cells[i]) {
> -			rval = -ENOMEM;
> -			goto out;
> -		}
> -
> -		rval = nvmem_cell_info_to_nvmem_cell_entry(nvmem, &info[i], cells[i]);
> -		if (rval) {
> -			kfree(cells[i]);
> -			goto out;
> -		}
> -
> -		nvmem_cell_entry_add(cells[i]);
> +		rval = nvmem_add_one_cell(nvmem, &info[i]);
> +		if (rval)
> +			return rval;
>   	}
>   
> -out:
> -	/* remove tmp array */
> -	kfree(cells);
> -
> -	return rval;
> +	return 0;
>   }
>   
>   /**
> diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
> index 14a32a1bc249..385d29168008 100644
> --- a/include/linux/nvmem-provider.h
> +++ b/include/linux/nvmem-provider.h
> @@ -155,6 +155,9 @@ struct nvmem_device *devm_nvmem_register(struct device *dev,
>   void nvmem_add_cell_table(struct nvmem_cell_table *table);
>   void nvmem_del_cell_table(struct nvmem_cell_table *table);
>   
> +int nvmem_add_one_cell(struct nvmem_device *nvmem,
> +		       const struct nvmem_cell_info *info);
> +
>   #else
>   
>   static inline struct nvmem_device *nvmem_register(const struct nvmem_config *c)
> @@ -172,6 +175,11 @@ devm_nvmem_register(struct device *dev, const struct nvmem_config *c)
>   
>   static inline void nvmem_add_cell_table(struct nvmem_cell_table *table) {}
>   static inline void nvmem_del_cell_table(struct nvmem_cell_table *table) {}
> +static inline int nvmem_add_one_cell(struct nvmem_device *nvmem,
> +				     const struct nvmem_cell_info *info)
> +{
> +	return -EOPNOTSUPP;
> +}
>   
>   #endif /* CONFIG_NVMEM */
>   #endif  /* ifndef _LINUX_NVMEM_PROVIDER_H */