linux-kernel - Re: [PATCH RFC 3/3] nvmem: add permission flags in nvmem

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Date:	Sat, 15 Aug 2015 09:21:56 +0200 (CEST)
From:	Stefan Wahren <stefan.wahren@...e.com>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:	wxt@...k-chips.com, linux-api@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>, p.zabel@...gutronix.de,
	Andrew Lunn <andrew@...n.ch>, sboyd@...eaurora.org,
	arnd@...db.de, linux-arm-kernel@...ts.infradead.org,
	khilman@...nel.org, maitysanchayan@...il.com,
	s.hauer@...gutronix.de, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, mporter@...sulko.com,
	pantelis.antoniou@...sulko.com, devicetree@...r.kernel.org,
	Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH RFC 3/3] nvmem: add permission flags in nvmem_config

Hi Srinivas,

> Srinivas Kandagatla <srinivas.kandagatla@...aro.org> hat am 11. August 2015 um
> 13:03 geschrieben:
>
>
> This patch adds perm variable to nvmem_config structure which will allow
> providers to specify the permissions required for the sysfs binary file.
> This permission is applied on top of root-only access permissions set by
> the core.
>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
> drivers/nvmem/core.c | 1 +
> include/linux/nvmem-provider.h | 1 +
> 2 files changed, 2 insertions(+)
>
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index 414ed23..7481387 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -312,6 +312,7 @@ struct nvmem_device *nvmem_register(const struct
> nvmem_config *config)
> config->read_only;
> nvmem->bin = bin_attr_template;
> nvmem->bin.attr.mode = nvmem->read_only ? : (S_IRUSR | S_IWUSR);
> + nvmem->bin.attr.mode |= config->perm;
> nvmem->bin.size = nvmem->size;
> device_initialize(&nvmem->dev);
>
> diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
> index 0b68caf..de9a61f 100644
> --- a/include/linux/nvmem-provider.h
> +++ b/include/linux/nvmem-provider.h
> @@ -23,6 +23,7 @@ struct nvmem_config {
> const struct nvmem_cell_info *cells;
> int ncells;
> bool read_only;
> + u16 perm; /* visibility in sysfs */

how about "umode_t mode" or "umode_t sysfs_mode"?

Beside that the whole series looks good to me.

Thanks Stefan
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