i2c: Refactor for_each callbacks

Functions i2c_do_add_adapter() and __attach_adapter() do essentially
the same thing, differing only in how the parameters are passed. Same
for i2c_do_add_adapter() and __detach_adapter(). Introduce wrappers to
normalize the parameters, so that we do not have to duplicate the
code.

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

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 37df0f1..4f34823 100644 (file)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -558,11 +558,9 @@ static void i2c_scan_static_board_info(struct i2c_adapter *adapter)
        up_read(&__i2c_board_lock);
 }
 
-static int i2c_do_add_adapter(struct device_driver *d, void *data)
+static int i2c_do_add_adapter(struct i2c_driver *driver,
+                             struct i2c_adapter *adap)
 {
-       struct i2c_driver *driver = to_i2c_driver(d);
-       struct i2c_adapter *adap = data;
-
        /* Detect supported devices on that bus, and instantiate them */
        i2c_detect(adap, driver);
 
@@ -574,6 +572,11 @@ static int i2c_do_add_adapter(struct device_driver *d, void *data)
        return 0;
 }
 
+static int __process_new_adapter(struct device_driver *d, void *data)
+{
+       return i2c_do_add_adapter(to_i2c_driver(d), data);
+}
+
 static int i2c_register_adapter(struct i2c_adapter *adap)
 {
        int res = 0, dummy;
@@ -614,7 +617,7 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
        /* Notify drivers */
        mutex_lock(&core_lock);
        dummy = bus_for_each_drv(&i2c_bus_type, NULL, adap,
-                                i2c_do_add_adapter);
+                                __process_new_adapter);
        mutex_unlock(&core_lock);
 
        return 0;
@@ -715,10 +718,9 @@ retry:
 }
 EXPORT_SYMBOL_GPL(i2c_add_numbered_adapter);
 
-static int i2c_do_del_adapter(struct device_driver *d, void *data)
+static int i2c_do_del_adapter(struct i2c_driver *driver,
+                             struct i2c_adapter *adapter)
 {
-       struct i2c_driver *driver = to_i2c_driver(d);
-       struct i2c_adapter *adapter = data;
        struct i2c_client *client, *_n;
        int res;
 
@@ -750,6 +752,11 @@ static int __unregister_client(struct device *dev, void *dummy)
        return 0;
 }
 
+static int __process_removed_adapter(struct device_driver *d, void *data)
+{
+       return i2c_do_del_adapter(to_i2c_driver(d), data);
+}
+
 /**
  * i2c_del_adapter - unregister I2C adapter
  * @adap: the adapter being unregistered
@@ -777,7 +784,7 @@ int i2c_del_adapter(struct i2c_adapter *adap)
        /* Tell drivers about this removal */
        mutex_lock(&core_lock);
        res = bus_for_each_drv(&i2c_bus_type, NULL, adap,
-                              i2c_do_del_adapter);
+                              __process_removed_adapter);
        mutex_unlock(&core_lock);
        if (res)
                return res;
@@ -826,22 +833,11 @@ EXPORT_SYMBOL(i2c_del_adapter);
 
 /* ------------------------------------------------------------------------- */
 
-static int __attach_adapter(struct device *dev, void *data)
+static int __process_new_driver(struct device *dev, void *data)
 {
-       struct i2c_adapter *adapter;
-       struct i2c_driver *driver = data;
-
        if (dev->type != &i2c_adapter_type)
                return 0;
-       adapter = to_i2c_adapter(dev);
-
-       i2c_detect(adapter, driver);
-
-       /* Legacy drivers scan i2c busses directly */
-       if (driver->attach_adapter)
-               driver->attach_adapter(adapter);
-
-       return 0;
+       return i2c_do_add_adapter(data, to_i2c_adapter(dev));
 }
 
 /*
@@ -873,40 +869,18 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver)
        INIT_LIST_HEAD(&driver->clients);
        /* Walk the adapters that are already present */
        mutex_lock(&core_lock);
-       bus_for_each_dev(&i2c_bus_type, NULL, driver, __attach_adapter);
+       bus_for_each_dev(&i2c_bus_type, NULL, driver, __process_new_driver);
        mutex_unlock(&core_lock);
 
        return 0;
 }
 EXPORT_SYMBOL(i2c_register_driver);
 
-static int __detach_adapter(struct device *dev, void *data)
+static int __process_removed_driver(struct device *dev, void *data)
 {
-       struct i2c_adapter *adapter;
-       struct i2c_driver *driver = data;
-       struct i2c_client *client, *_n;
-
        if (dev->type != &i2c_adapter_type)
                return 0;
-       adapter = to_i2c_adapter(dev);
-
-       /* Remove the devices we created ourselves as the result of hardware
-        * probing (using a driver's detect method) */
-       list_for_each_entry_safe(client, _n, &driver->clients, detected) {
-               dev_dbg(&adapter->dev, "Removing %s at 0x%x\n",
-                       client->name, client->addr);
-               list_del(&client->detected);
-               i2c_unregister_device(client);
-       }
-
-       if (driver->detach_adapter) {
-               if (driver->detach_adapter(adapter))
-                       dev_err(&adapter->dev,
-                               "detach_adapter failed for driver [%s]\n",
-                               driver->driver.name);
-       }
-
-       return 0;
+       return i2c_do_del_adapter(data, to_i2c_adapter(dev));
 }
 
 /**
@@ -917,7 +891,7 @@ static int __detach_adapter(struct device *dev, void *data)
 void i2c_del_driver(struct i2c_driver *driver)
 {
        mutex_lock(&core_lock);
-       bus_for_each_dev(&i2c_bus_type, NULL, driver, __detach_adapter);
+       bus_for_each_dev(&i2c_bus_type, NULL, driver, __process_removed_driver);
        mutex_unlock(&core_lock);
 
        driver_unregister(&driver->driver);