ieee1394: video1394: reorder module init, prepare BKL removal

This prepares video1394 for removal of the BKL (big kernel lock):
It allows video1394_open() to be called while video1394_init_module()
is still in progress.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/ieee1394/highlevel.c

@@ -228,10 +228,8 @@ void hpsb_register_highlevel(struct hpsb_highlevel *hl)
 {
 	unsigned long flags;
 
+	hpsb_init_highlevel(hl);
 	INIT_LIST_HEAD(&hl->addr_list);
-	INIT_LIST_HEAD(&hl->host_info_list);
-
-	rwlock_init(&hl->host_info_lock);
 
 	down_write(&hl_drivers_sem);
 	list_add_tail(&hl->hl_list, &hl_drivers);

drivers/ieee1394/highlevel.h

@@ -2,7 +2,7 @@
 #define IEEE1394_HIGHLEVEL_H
 
 #include <linux/list.h>
-#include <linux/spinlock_types.h>
+#include <linux/spinlock.h>
 #include <linux/types.h>
 
 struct module;
@@ -103,6 +103,17 @@ int highlevel_lock64(struct hpsb_host *host, int nodeid, octlet_t *store,
 void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,
 			   void *data, size_t length);
 
+/**
+ * hpsb_init_highlevel - initialize a struct hpsb_highlevel
+ *
+ * This is only necessary if hpsb_get_hostinfo_bykey can be called
+ * before hpsb_register_highlevel.
+ */
+static inline void hpsb_init_highlevel(struct hpsb_highlevel *hl)
+{
+	rwlock_init(&hl->host_info_lock);
+	INIT_LIST_HEAD(&hl->host_info_list);
+}
 void hpsb_register_highlevel(struct hpsb_highlevel *hl);
 void hpsb_unregister_highlevel(struct hpsb_highlevel *hl);
 

drivers/ieee1394/video1394.c

@@ -1503,6 +1503,8 @@ static int __init video1394_init_module (void)
 {
 	int ret;
 
+	hpsb_init_highlevel(&video1394_highlevel);
+
 	cdev_init(&video1394_cdev, &video1394_fops);
 	video1394_cdev.owner = THIS_MODULE;
 	ret = cdev_add(&video1394_cdev, IEEE1394_VIDEO1394_DEV, 16);