[04/04 mm-patch, rfc] Add lightweight rwlock to net/bluetooth/af_bluetooth.c (was Re: [mm-patch] bluetooth: use GFP_ATOMIC in *_sock_create's sk_alloc)

[Frederik Deweerdt <deweerdt@free.fr>]

This patch is part of the lw_rwlock patchset, it removes the
bt_proto_rwlock lock from af_bluetooth.c and uses the newly available
linux/lw_rwlock.h

Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>

--- v2.6.18-rc2-mm1~ori/net/bluetooth/af_bluetooth.c	2006-07-27 11:46:12.000000000 +0200
+++ v2.6.18-rc2-mm1/net/bluetooth/af_bluetooth.c	2006-07-28 16:22:50.000000000 +0200
@@ -27,6 +27,7 @@
 #include <linux/module.h>
 
 #include <linux/spinlock.h>
+#include <linux/lw_rwlock.h>
 #include <linux/types.h>
 #include <linux/list.h>
 #include <linux/errno.h>
@@ -54,7 +55,7 @@
 /* Bluetooth sockets */
 #define BT_MAX_PROTO	8
 static struct net_proto_family *bt_proto[BT_MAX_PROTO];
-static DEFINE_RWLOCK(bt_proto_rwlock);
+static DEFINE_LW_RWLOCK(bt_proto_rwlock);
 
 int bt_sock_register(int proto, struct net_proto_family *ops)
 {
@@ -65,12 +66,12 @@ int bt_sock_register(int proto, struct n
 
 	err = -EEXIST;
 
-	write_lock(&bt_proto_rwlock);
+	lw_write_lock(&bt_proto_rwlock);
 	if (bt_proto[proto] == NULL) {
 		err = 0;
 		bt_proto[proto] = ops;
 	}
-	write_unlock(&bt_proto_rwlock);
+	lw_write_unlock(&bt_proto_rwlock);
 
 	return err;
 }
@@ -84,12 +85,12 @@ int bt_sock_unregister(int proto)
 		return -EINVAL;
 
 	err = -ENOENT;
-	write_lock(&bt_proto_rwlock);
+	lw_write_lock(&bt_proto_rwlock);
 	if (bt_proto[proto]) {
 		err = 0;
 		bt_proto[proto] = NULL;
 	}
-	write_unlock(&bt_proto_rwlock);
+	lw_write_unlock(&bt_proto_rwlock);
 
 	return err;
 }
@@ -108,12 +109,12 @@ static int bt_sock_create(struct socket 
 	}
 #endif
 	err = -EPROTONOSUPPORT;
-	read_lock(&bt_proto_rwlock);
+	lw_read_lock(&bt_proto_rwlock);
 	if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
 		err = bt_proto[proto]->create(sock, proto);
 		module_put(bt_proto[proto]->owner);
 	}
-	read_unlock(&bt_proto_rwlock);
+	lw_read_unlock(&bt_proto_rwlock);
 	return err; 
 }