i2c: Use the driver model reference counting
Don't implement our own reference counting mechanism for i2c clients
when the driver model already has one.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: David Brownell <david-b@pacbell.net>
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 7788e17..9b9d808 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -696,8 +696,6 @@
}
list_add_tail(&client->list,&adapter->clients);
- client->usage_count = 0;
-
client->dev.parent = &client->adapter->dev;
client->dev.bus = &i2c_bus_type;
@@ -744,12 +742,6 @@
struct i2c_adapter *adapter = client->adapter;
int res = 0;
- if (client->usage_count > 0) {
- dev_warn(&client->dev, "Client [%s] still busy, "
- "can't detach\n", client->name);
- return -EBUSY;
- }
-
if (adapter->client_unregister) {
res = adapter->client_unregister(client);
if (res) {
@@ -772,50 +764,16 @@
}
EXPORT_SYMBOL(i2c_detach_client);
-static int i2c_inc_use_client(struct i2c_client *client)
-{
-
- if (!try_module_get(client->driver->driver.owner))
- return -ENODEV;
- if (!try_module_get(client->adapter->owner)) {
- module_put(client->driver->driver.owner);
- return -ENODEV;
- }
-
- return 0;
-}
-
-static void i2c_dec_use_client(struct i2c_client *client)
-{
- module_put(client->driver->driver.owner);
- module_put(client->adapter->owner);
-}
-
int i2c_use_client(struct i2c_client *client)
{
- int ret;
-
- ret = i2c_inc_use_client(client);
- if (ret)
- return ret;
-
- client->usage_count++;
-
+ get_device(&client->dev);
return 0;
}
EXPORT_SYMBOL(i2c_use_client);
int i2c_release_client(struct i2c_client *client)
{
- if (!client->usage_count) {
- pr_debug("i2c-core: %s used one too many times\n",
- __FUNCTION__);
- return -EPERM;
- }
-
- client->usage_count--;
- i2c_dec_use_client(client);
-
+ put_device(&client->dev);
return 0;
}
EXPORT_SYMBOL(i2c_release_client);
diff --git a/drivers/media/video/ks0127.c b/drivers/media/video/ks0127.c
index b6cd21e..4895540 100644
--- a/drivers/media/video/ks0127.c
+++ b/drivers/media/video/ks0127.c
@@ -764,7 +764,6 @@
.addr = 0,
.adapter = NULL,
.driver = &i2c_driver_ks0127,
- .usage_count = 0
};
static int ks0127_found_proc(struct i2c_adapter *adapter, int addr, int kind)
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 37c14b0..f7cd2f3 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -155,7 +155,6 @@
* generic enough to hide second-sourcing and compatible revisions.
* @adapter: manages the bus segment hosting this I2C device
* @driver: device's driver, hence pointer to access routines
- * @usage_count: counts current number of users of this client
* @dev: Driver model device node for the slave.
* @irq: indicates the IRQ generated by this device (if any)
* @driver_name: Identifies new-style driver used with this device; also
@@ -175,8 +174,6 @@
char name[I2C_NAME_SIZE];
struct i2c_adapter *adapter; /* the adapter we sit on */
struct i2c_driver *driver; /* and our access routines */
- int usage_count; /* How many accesses currently */
- /* to the client */
struct device dev; /* the device structure */
int irq; /* irq issued by device (or -1) */
char driver_name[KOBJ_NAME_LEN];