i2c: Kill the redundant client list

We used to maintain our own per-adapter list of i2c clients, but this
is redundant with what the driver core does, and no longer needed.
Just drop the redundant list.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: David Brownell <dbrownell@users.sourceforge.net>

1 files changed, 11 insertions, 17 deletions

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 95fb997b41e..b1fd00d9a5c 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -276,10 +276,6 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
         if (status)
                 goto out_err;
 
-        mutex_lock(&adap->clist_lock);
-        list_add_tail(&client->list, &adap->clients);
-        mutex_unlock(&adap->clist_lock);
-
         dev_dbg(&adap->dev, "client [%s] registered with bus id %s\n",
                 client->name, dev_name(&client->dev));
 
@@ -301,12 +297,6 @@ EXPORT_SYMBOL_GPL(i2c_new_device);
  */
 void i2c_unregister_device(struct i2c_client *client)
 {
-        struct i2c_adapter      *adapter = client->adapter;
-
-        mutex_lock(&adapter->clist_lock);
-        list_del(&client->list);
-        mutex_unlock(&adapter->clist_lock);
-
         device_unregister(&client->dev);
 }
 EXPORT_SYMBOL_GPL(i2c_unregister_device);
@@ -432,8 +422,6 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
                 return -EAGAIN;
 
         mutex_init(&adap->bus_lock);
-        mutex_init(&adap->clist_lock);
-        INIT_LIST_HEAD(&adap->clients);
 
         mutex_lock(&core_lock);
 
@@ -583,6 +571,14 @@ static int i2c_do_del_adapter(struct device_driver *d, void *data)
         return res;
 }
 
+static int __unregister_client(struct device *dev, void *dummy)
+{
+        struct i2c_client *client = i2c_verify_client(dev);
+        if (client)
+                i2c_unregister_device(client);
+        return 0;
+}
+
 /**
  * i2c_del_adapter - unregister I2C adapter
  * @adap: the adapter being unregistered
@@ -593,7 +589,6 @@ static int i2c_do_del_adapter(struct device_driver *d, void *data)
  */
 int i2c_del_adapter(struct i2c_adapter *adap)
 {
-        struct i2c_client *client, *_n;
         int res = 0;
 
         mutex_lock(&core_lock);
@@ -612,10 +607,9 @@ int i2c_del_adapter(struct i2c_adapter *adap)
         if (res)
                 goto out_unlock;
 
-        /* Detach any active clients */
-        list_for_each_entry_safe_reverse(client, _n, &adap->clients, list) {
-                i2c_unregister_device(client);
-        }
+        /* Detach any active clients. This can't fail, thus we do not
+           checking the returned value. */
+        res = device_for_each_child(&adap->dev, NULL, __unregister_client);
 
         /* clean up the sysfs representation */
         init_completion(&adap->dev_released);