i2c: Export i2c_for_each_dev

Introduce i2c_for_each_dev(), an i2c device iterator with proper
locking for use by i2c-dev. This is needed so that we can get rid of
the attach_adapter and detach_adapter legacy callback functions.

Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 14 insertions, 6 deletions

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index f7620cada782..b9fa1d0320b4 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1091,6 +1091,18 @@ EXPORT_SYMBOL(i2c_del_adapter);
 
 /* ------------------------------------------------------------------------- */
 
+int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *))
+{
+        int res;
+
+        mutex_lock(&core_lock);
+        res = bus_for_each_dev(&i2c_bus_type, NULL, data, fn);
+        mutex_unlock(&core_lock);
+
+        return res;
+}
+EXPORT_SYMBOL_GPL(i2c_for_each_dev);
+
 static int __process_new_driver(struct device *dev, void *data)
 {
         if (dev->type != &i2c_adapter_type)
@@ -1134,9 +1146,7 @@ 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, __process_new_driver);
-        mutex_unlock(&core_lock);
+        i2c_for_each_dev(driver, __process_new_driver);
 
         return 0;
 }
@@ -1156,9 +1166,7 @@ static int __process_removed_driver(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, __process_removed_driver);
-        mutex_unlock(&core_lock);
+        i2c_for_each_dev(driver, __process_removed_driver);
 
         driver_unregister(&driver->driver);
         pr_debug("i2c-core: driver [%s] unregistered\n", driver->driver.name);