[PATCH 1/3] net: dsa: introduce module_switch_driver macro

[Vivien Didelot]

This commit introduces a new module_switch_driver macro, similar to
module_platform_driver and such, to reduce boilerplate when declaring
DSA switch drivers.

In order to use the module_driver macro, register_switch_driver needed
to be changed to return an int instead of void, so make it return 0.

Signed-off-by: Vivien Didelot <vivien.didelot@xxxxxxxxxxxxxxxxxxxx>
---
 include/net/dsa.h | 13 ++++++++++++-
 net/dsa/dsa.c     |  4 +++-
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index fbca63b..927f16a 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -11,6 +11,7 @@
 #ifndef __LINUX_NET_DSA_H
 #define __LINUX_NET_DSA_H
 
+#include <linux/device.h>
 #include <linux/if_ether.h>
 #include <linux/list.h>
 #include <linux/timer.h>
@@ -304,8 +305,18 @@ struct dsa_switch_driver {
 			       unsigned char *addr, bool *is_static);
 };
 
-void register_switch_driver(struct dsa_switch_driver *type);
+int register_switch_driver(struct dsa_switch_driver *type);
 void unregister_switch_driver(struct dsa_switch_driver *type);
+
+/* module_switch_driver() - Helper macro for drivers that don't do anything
+ * special in module init/exit. This eliminates a lot of boilerplate. Each
+ * module may only use this macro once, and calling it replaces module_init()
+ * and module_exit()
+ */
+#define module_switch_driver(__switch_driver) \
+	module_driver(__switch_driver, register_switch_driver, \
+			unregister_switch_driver)
+
 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev);
 
 static inline void *ds_to_priv(struct dsa_switch *ds)
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index e6f6cc3..9630522 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -31,11 +31,13 @@ char dsa_driver_version[] = "0.1";
 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
 static LIST_HEAD(dsa_switch_drivers);
 
-void register_switch_driver(struct dsa_switch_driver *drv)
+int register_switch_driver(struct dsa_switch_driver *drv)
 {
 	mutex_lock(&dsa_switch_drivers_mutex);
 	list_add_tail(&drv->list, &dsa_switch_drivers);
 	mutex_unlock(&dsa_switch_drivers_mutex);
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(register_switch_driver);
 
-- 
2.3.7

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