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i2c: remove helpers for ref-counting clients

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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.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Tested-by: Luca Ceresoli <luca@lucaceresoli.net>
Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
This commit is contained in:
Wolfram Sang 2019-11-09 22:16:33 +01:00 committed by Wolfram Sang
parent 79e4be2c08
commit 9af433840b
2 changed files with 0 additions and 35 deletions
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32
drivers/i2c/i2c-core-base.c
View File

@ -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;

3
include/linux/i2c.h
View File

@ -850,9 +850,6 @@ extern void i2c_del_driver(struct i2c_driver *driver);
#define i2c_add_driver(driver) \
i2c_register_driver(THIS_MODULE, 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,