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i2c: Drop redundant i2c_driver.list 

i2c_driver.list is superfluous, this list duplicates the one
maintained by the driver core. Drop it.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
This commit is contained in:
Jean Delvare 2008-01-27 18:14:49 +01:00 committed by Jean Delvare
parent 87c6c22945
commit 026526f5af
2 changed files with 35 additions and 24 deletions
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58
drivers/i2c/i2c-core.c
View File

@ -39,7 +39,6 @@
#include "i2c-core.h"
static LIST_HEAD(drivers);
static DEFINE_MUTEX(core_lists);
static DEFINE_IDR(i2c_adapter_idr);
@ -320,11 +319,21 @@ static void i2c_scan_static_board_info(struct i2c_adapter *adapter)
mutex_unlock(&__i2c_board_lock);
}
static int i2c_do_add_adapter(struct device_driver *d, void *data)
{
struct i2c_driver *driver = to_i2c_driver(d);
struct i2c_adapter *adap = data;
if (driver->attach_adapter) {
/* We ignore the return code; if it fails, too bad */
driver->attach_adapter(adap);
}
return 0;
}
static int i2c_register_adapter(struct i2c_adapter *adap)
{
int res = 0;
struct list_head *item;
struct i2c_driver *driver;
int res = 0, dummy;
mutex_init(&adap->bus_lock);
mutex_init(&adap->clist_lock);
@ -355,12 +364,8 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
i2c_scan_static_board_info(adap);
/* let legacy drivers scan this bus for matching devices */
list_for_each(item,&drivers) {
driver = list_entry(item, struct i2c_driver, list);
if (driver->attach_adapter)
/* We ignore the return code; if it fails, too bad */
driver->attach_adapter(adap);
}
dummy = bus_for_each_drv(&i2c_bus_type, NULL, adap,
i2c_do_add_adapter);
out_unlock:
mutex_unlock(&core_lists);
@ -460,6 +465,21 @@ retry:
}
EXPORT_SYMBOL_GPL(i2c_add_numbered_adapter);
static int i2c_do_del_adapter(struct device_driver *d, void *data)
{
struct i2c_driver *driver = to_i2c_driver(d);
struct i2c_adapter *adapter = data;
int res;
if (!driver->detach_adapter)
return 0;
res = driver->detach_adapter(adapter);
if (res)
dev_err(&adapter->dev, "detach_adapter failed (%d) "
"for driver [%s]\n", res, driver->driver.name);
return res;
}
/**
* i2c_del_adapter - unregister I2C adapter
* @adap: the adapter being unregistered
@ -471,7 +491,6 @@ EXPORT_SYMBOL_GPL(i2c_add_numbered_adapter);
int i2c_del_adapter(struct i2c_adapter *adap)
{
struct list_head *item, *_n;
struct i2c_driver *driver;
struct i2c_client *client;
int res = 0;
@ -485,16 +504,11 @@ int i2c_del_adapter(struct i2c_adapter *adap)
goto out_unlock;
}
list_for_each(item,&drivers) {
driver = list_entry(item, struct i2c_driver, list);
if (driver->detach_adapter)
if ((res = driver->detach_adapter(adap))) {
dev_err(&adap->dev, "detach_adapter failed "
"for driver [%s]\n",
driver->driver.name);
goto out_unlock;
}
}
/* Tell drivers about this removal */
res = bus_for_each_drv(&i2c_bus_type, NULL, adap,
i2c_do_del_adapter);
if (res)
goto out_unlock;
/* detach any active clients. This must be done first, because
* it can fail; in which case we give up. */
@ -577,7 +591,6 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver)
mutex_lock(&core_lists);
list_add_tail(&driver->list,&drivers);
pr_debug("i2c-core: driver [%s] registered\n", driver->driver.name);
/* legacy drivers scan i2c busses directly */
@ -647,7 +660,6 @@ void i2c_del_driver(struct i2c_driver *driver)
unregister:
driver_unregister(&driver->driver);
list_del(&driver->list);
pr_debug("i2c-core: driver [%s] unregistered\n", driver->driver.name);
mutex_unlock(&core_lists);

1
include/linux/i2c.h
View File

@ -140,7 +140,6 @@ struct i2c_driver {
int (*command)(struct i2c_client *client,unsigned int cmd, void *arg);
struct device_driver driver;
struct list_head list;
};
#define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)