[PATCH] pcmcia: add bus_type pcmcia_bus_type

Register a bus_type pcmcia_bus_type. This means the initialization of
the ds module needs to be done in two levels: one quite early
(subsys_initcall) so that drivers may use the bus_type; the other one
must stay that late (late_initcall). As only one initcall can be
specified within one module, some tweaking is needed.

drivers/pcmcia/ds.c

@@ -881,7 +881,18 @@ EXPORT_SYMBOL(unregister_pccard_driver);
 
 /*====================================================================*/
 
-int __init init_pcmcia_ds(void)
+struct bus_type pcmcia_bus_type = {
+	.name = "pcmcia",
+};
+EXPORT_SYMBOL(pcmcia_bus_type);
+
+static int __init init_pcmcia_bus(void)
+{
+	bus_register(&pcmcia_bus_type);
+	return 0;
+}
+
+static int __init init_pcmcia_ds(void)
 {
     client_reg_t client_reg;
     servinfo_t serv;
@@ -967,11 +978,8 @@ int __init init_pcmcia_ds(void)
     return 0;
 }
 
-late_initcall(init_pcmcia_ds);
 
-#ifdef MODULE
-
-void __exit cleanup_module(void)
+static void __exit exit_pcmcia_ds(void)
 {
     int i;
 #ifdef CONFIG_PROC_FS
@@ -984,6 +992,23 @@ void __exit cleanup_module(void)
 	pcmcia_deregister_client(socket_table[i].handle);
     sockets = 0;
     kfree(socket_table);
+    bus_unregister(&pcmcia_bus_type);
 }
 
+#ifdef MODULE
+
+/* init_pcmcia_bus must be done early, init_pcmcia_ds late. If we load this 
+ * as a module, we can only specify one initcall, though... 
+ */
+static int __init init_pcmcia_module(void) {
+	init_pcmcia_bus();
+	return init_pcmcia_ds();
+}
+module_init(init_pcmcia_module);
+
+#else /* !MODULE */
+subsys_initcall(init_pcmcia_bus);
+late_initcall(init_pcmcia_ds);
 #endif
+
+module_exit(exit_pcmcia_ds);

include/pcmcia/ds.h

@@ -32,6 +32,7 @@
 
 #include <pcmcia/driver_ops.h>
 #include <pcmcia/bulkmem.h>
+#include <linux/device.h>
 
 typedef struct tuple_parse_t {
     tuple_t		tuple;
@@ -143,6 +144,8 @@ int unregister_pccard_driver(dev_info_t *dev_info);
 #define register_pcmcia_driver register_pccard_driver
 #define unregister_pcmcia_driver unregister_pccard_driver
 
+extern struct bus_type pcmcia_bus_type;
+
 #endif /* __KERNEL__ */
 
 #endif /* _LINUX_DS_H */