[PATCH 07/18] driver: Add unregister_driver()

[Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>]

Registering drivers is one thing, getting rid of them another. Add
unregister_driver() which is used in the coming USB gadget update.

Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
 drivers/base/driver.c | 16 ++++++++++++++++
 include/driver.h      |  2 ++
 2 files changed, 18 insertions(+)

diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index efbffcdddb..719920ec67 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -405,6 +405,22 @@ int register_driver(struct driver *drv)
 }
 EXPORT_SYMBOL(register_driver);
 
+void unregister_driver(struct driver *drv)
+{
+	struct device *dev;
+
+	list_del(&drv->list);
+	list_del(&drv->bus_list);
+
+	bus_for_each_device(drv->bus, dev) {
+		if (dev->driver == drv) {
+			drv->bus->remove(dev);
+			dev->driver = NULL;
+			list_del(&dev->active);
+		}
+	}
+}
+
 struct resource *dev_get_resource(struct device *dev, unsigned long type,
 				  int num)
 {
diff --git a/include/driver.h b/include/driver.h
index 2cf0190699..5605a3db24 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -137,6 +137,8 @@ struct driver {
 /* Register devices and drivers.
  */
 int register_driver(struct driver *);
+void unregister_driver(struct driver *drv);
+
 int register_device(struct device *);
 
 /* manualy probe a device
-- 
2.30.2