o ipx: convert ipx_route to use list_head

include/net/ipx.h

@@ -75,7 +75,7 @@ struct ipx_route {
 	struct ipx_interface	*ir_intrfc;
 	unsigned char		ir_routed;
 	unsigned char		ir_router_node[IPX_NODE_LEN];
-	struct ipx_route	*ir_next;
+	struct list_head	node; /* node in ipx_routes list */
 	atomic_t		refcnt;
 };
 
@@ -111,7 +111,7 @@ struct ipx_opt {
 #define IPX_MIN_EPHEMERAL_SOCKET	0x4000
 #define IPX_MAX_EPHEMERAL_SOCKET	0x7fff
 
-extern struct ipx_route *ipx_routes;
+extern struct list_head ipx_routes;
 extern rwlock_t ipx_routes_lock;
 
 extern struct list_head ipx_interfaces;

net/ipx/af_ipx.c

@@ -81,7 +81,7 @@ static struct datalink_proto *pSNAP_datalink;
 
 static struct proto_ops ipx_dgram_ops;
 
-struct ipx_route *ipx_routes;
+LIST_HEAD(ipx_routes);
 rwlock_t ipx_routes_lock = RW_LOCK_UNLOCKED;
 
 LIST_HEAD(ipx_interfaces);
@@ -1277,12 +1277,14 @@ static struct ipx_route *ipxrtr_lookup(__u32 net)
 	struct ipx_route *r;
 
 	read_lock_bh(&ipx_routes_lock);
-	for (r = ipx_routes; r && r->ir_net != net; r = r->ir_next)
-		;
-	if (r)
-		ipxrtr_hold(r);
+	list_for_each_entry(r, &ipx_routes, node)
+		if (r->ir_net == net) {
+			ipxrtr_hold(r);
+			goto unlock;
+		}
+	r = NULL;
+unlock:
 	read_unlock_bh(&ipx_routes_lock);
-
 	return r;
 }
 
@@ -1305,8 +1307,7 @@ static int ipxrtr_add_route(__u32 network, struct ipx_interface *intrfc,
 		atomic_set(&rt->refcnt, 1);
 		ipxrtr_hold(rt);
 		write_lock_bh(&ipx_routes_lock);
-		rt->ir_next	= ipx_routes;
-		ipx_routes	= rt;
+		list_add(&rt->node, &ipx_routes);
 		write_unlock_bh(&ipx_routes_lock);
 	} else {
 		rc = -EEXIST;
@@ -1333,16 +1334,14 @@ static int ipxrtr_add_route(__u32 network, struct ipx_interface *intrfc,
 
 static void ipxrtr_del_routes(struct ipx_interface *intrfc)
 {
-	struct ipx_route **r, *tmp;
+	struct ipx_route *r, *tmp;
 
 	write_lock_bh(&ipx_routes_lock);
-	for (r = &ipx_routes; (tmp = *r) != NULL;) {
-		if (tmp->ir_intrfc == intrfc) {
-			*r = tmp->ir_next;
-			ipxrtr_put(tmp);
-		} else
-			r = &(tmp->ir_next);
-	}
+	list_for_each_entry_safe(r, tmp, &ipx_routes, node)
+		if (r->ir_intrfc == intrfc) {
+			list_del(&r->node);
+			ipxrtr_put(r);
+		}
 	write_unlock_bh(&ipx_routes_lock);
 }
 
@@ -1363,26 +1362,21 @@ static int ipxrtr_create(struct ipx_route_definition *rd)
 
 static int ipxrtr_delete(long net)
 {
-	struct ipx_route **r;
-	struct ipx_route *tmp;
+	struct ipx_route *r, *tmp;
 	int rc;
 
 	write_lock_bh(&ipx_routes_lock);
-	for (r = &ipx_routes; (tmp = *r) != NULL;) {
-		if (tmp->ir_net == net) {
+	list_for_each_entry_safe(r, tmp, &ipx_routes, node)
+		if (r->ir_net == net) {
 			/* Directly connected; can't lose route */
 			rc = -EPERM;
-			if (!tmp->ir_routed)
+			if (!r->ir_routed)
 				goto out;
-
-			*r = tmp->ir_next;
-			ipxrtr_put(tmp);
+			list_del(&r->node);
+			ipxrtr_put(r);
 			rc = 0;
 			goto out;
 		}
-
-		r = &(tmp->ir_next);
-	}
 	rc = -ENOENT;
 out:
 	write_unlock_bh(&ipx_routes_lock);

net/ipx/ipx_proc.c

@@ -89,13 +89,33 @@ static int ipx_seq_interface_show(struct seq_file *seq, void *v)
 	return 0;
 }
 
+static struct ipx_route *ipx_routes_head(void)
+{
+	struct ipx_route *rc = NULL;
+
+	if (!list_empty(&ipx_routes))
+		rc = list_entry(ipx_routes.next, struct ipx_route, node);
+	return rc;
+}
+
+static struct ipx_route *ipx_routes_next(struct ipx_route *r)
+{
+	struct ipx_route *rc = NULL;
+
+	if (r->node.next != &ipx_routes)
+		rc = list_entry(r->node.next, struct ipx_route, node);
+	return rc;
+}
+
 static __inline__ struct ipx_route *ipx_get_route_idx(loff_t pos)
 {
 	struct ipx_route *r;
 
-	for (r = ipx_routes; pos && r; r = r->ir_next)
-		--pos;
-
+	list_for_each_entry(r, &ipx_routes, node)
+		if (!pos--)
+			goto out;
+	r = NULL;
+out:
 	return r;
 }
 
@@ -111,15 +131,10 @@ static void *ipx_seq_route_next(struct seq_file *seq, void *v, loff_t *pos)
 	struct ipx_route *r;
 
 	++*pos;
-	if (v == (void *)1) {
-		r = NULL;
-		if (ipx_routes)
-			r = ipx_routes;
-		goto out;
-	}
-	r = v;
-	r = r->ir_next;
-out:
+	if (v == (void *)1)
+		r = ipx_routes_head();
+	else
+		r = ipx_routes_next(v);
 	return r;
 }