linux-kernel - Re: [PATCH] i2c: remove helpers for ref-counting clients

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Date:   Mon, 11 Nov 2019 11:27:30 +0100
From:   Niklas Söderlund 
        <niklas.soderlund@...natech.se>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jean Delvare <jdelvare@...e.de>,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH] i2c: remove helpers for ref-counting clients

Hi Wolfram,

Thanks for your work.

On 2019-11-09 22:26:15 +0100, Wolfram Sang wrote:
> There are no in-tree users of these helpers anymore, and there
> shouldn't. Most use cases went away once the driver model started to
> refcount for us. There have been users like the media subsystem, but
> they all switched to better refcounting methods meanwhile. Media did
> this in 2008. Last user (IPMI) left 2018. Remove this cruft.

Nice to clean out some old stuff :-)

> 
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>

> ---
>  drivers/i2c/i2c-core-base.c | 32 --------------------------------
>  include/linux/i2c.h         |  3 ---
>  2 files changed, 35 deletions(-)
> 
> diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
> index 9c55d24c7a30..5a44a92ed1fb 100644
> --- a/drivers/i2c/i2c-core-base.c
> +++ b/drivers/i2c/i2c-core-base.c
> @@ -1743,38 +1743,6 @@ EXPORT_SYMBOL(i2c_del_driver);
>  
>  /* ------------------------------------------------------------------------- */
>  
> -/**
> - * i2c_use_client - increments the reference count of the i2c client structure
> - * @client: the client being referenced
> - *
> - * Each live reference to a client should be refcounted. The driver model does
> - * that automatically as part of driver binding, so that most drivers don't
> - * need to do this explicitly: they hold a reference until they're unbound
> - * from the device.
> - *
> - * A pointer to the client with the incremented reference counter is returned.
> - */
> -struct i2c_client *i2c_use_client(struct i2c_client *client)
> -{
> -	if (client && get_device(&client->dev))
> -		return client;
> -	return NULL;
> -}
> -EXPORT_SYMBOL(i2c_use_client);
> -
> -/**
> - * i2c_release_client - release a use of the i2c client structure
> - * @client: the client being no longer referenced
> - *
> - * Must be called when a user of a client is finished with it.
> - */
> -void i2c_release_client(struct i2c_client *client)
> -{
> -	if (client)
> -		put_device(&client->dev);
> -}
> -EXPORT_SYMBOL(i2c_release_client);
> -
>  struct i2c_cmd_arg {
>  	unsigned	cmd;
>  	void		*arg;
> diff --git a/include/linux/i2c.h b/include/linux/i2c.h
> index 8f512b992acd..23583f76c6dc 100644
> --- a/include/linux/i2c.h
> +++ b/include/linux/i2c.h
> @@ -861,9 +861,6 @@ static inline bool i2c_client_has_driver(struct i2c_client *client)
>  	return !IS_ERR_OR_NULL(client) && client->dev.driver;
>  }
>  
> -extern struct i2c_client *i2c_use_client(struct i2c_client *client);
> -extern void i2c_release_client(struct i2c_client *client);
> -
>  /* call the i2c_client->command() of all attached clients with
>   * the given arguments */
>  extern void i2c_clients_command(struct i2c_adapter *adap,
> -- 
> 2.20.1
> 

-- 
Regards,
Niklas Söderlund