usb: ulpi: Automatically set driver::owner with ulpi_driver_register()

Let's follow other driver registration functions and
automatically set the driver's owner member to THIS_MODULE when
ulpi_driver_register() is called. This allows ulpi driver writers
to forget about this boiler plate detail and avoids common bugs
in the process.

Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/common/ulpi.c

@@ -127,16 +127,17 @@ static struct device_type ulpi_dev_type = {
  *
  * Registers a driver with the ULPI bus.
  */
-int ulpi_register_driver(struct ulpi_driver *drv)
+int __ulpi_register_driver(struct ulpi_driver *drv, struct module *module)
 {
 	if (!drv->probe)
 		return -EINVAL;
 
+	drv->driver.owner = module;
 	drv->driver.bus = &ulpi_bus;
 
 	return driver_register(&drv->driver);
 }
-EXPORT_SYMBOL_GPL(ulpi_register_driver);
+EXPORT_SYMBOL_GPL(__ulpi_register_driver);
 
 /**
  * ulpi_unregister_driver - unregister a driver with the ULPI bus

include/linux/ulpi/driver.h

@@ -47,7 +47,11 @@ struct ulpi_driver {
 
 #define to_ulpi_driver(d) container_of(d, struct ulpi_driver, driver)
 
-int ulpi_register_driver(struct ulpi_driver *drv);
+/*
+ * use a macro to avoid include chaining to get THIS_MODULE
+ */
+#define ulpi_register_driver(drv) __ulpi_register_driver(drv, THIS_MODULE)
+int __ulpi_register_driver(struct ulpi_driver *drv, struct module *module);
 void ulpi_unregister_driver(struct ulpi_driver *drv);
 
 #define module_ulpi_driver(__ulpi_driver) \