linux-kernel - [PATCH] usb: ulpi: Automatically set driver::owner with ulpi_driver

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Message-Id: <20160626053821.10577-1-stephen.boyd@linaro.org>
Date:	Sat, 25 Jun 2016 22:38:21 -0700
From:	Stephen Boyd <stephen.boyd@...aro.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: [PATCH] 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.

Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Stephen Boyd <stephen.boyd@...aro.org>
---
 drivers/usb/common/ulpi.c   | 5 +++--
 include/linux/ulpi/driver.h | 6 +++++-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/common/ulpi.c b/drivers/usb/common/ulpi.c
index a6b2a150b176..4e15e2b9f4b4 100644
--- a/drivers/usb/common/ulpi.c
+++ b/drivers/usb/common/ulpi.c
@@ -148,16 +148,17 @@ 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
diff --git a/include/linux/ulpi/driver.h b/include/linux/ulpi/driver.h
index 388f6e08b9d4..80b36ca12e80 100644
--- a/include/linux/ulpi/driver.h
+++ b/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) \
-- 
2.9.0.rc2.8.ga28705d