ipv6: use standard lists for FIB walks

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ip6_fib.h

@@ -124,7 +124,7 @@ static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
 }
 
 struct fib6_walker_t {
-	struct fib6_walker_t *prev, *next;
+	struct list_head lh;
 	struct fib6_node *root, *node;
 	struct rt6_info *leaf;
 	unsigned char state;

net/ipv6/ip6_fib.c

@@ -93,29 +93,20 @@ static __u32 rt_sernum;
 
 static void fib6_gc_timer_cb(unsigned long arg);
 
-static struct fib6_walker_t fib6_walker_list = {
-	.prev	= &fib6_walker_list,
-	.next	= &fib6_walker_list,
-};
-
-#define FOR_WALKERS(w) for ((w)=fib6_walker_list.next; (w) != &fib6_walker_list; (w)=(w)->next)
+static LIST_HEAD(fib6_walkers);
+#define FOR_WALKERS(w) list_for_each_entry(w, &fib6_walkers, lh)
 
 static inline void fib6_walker_link(struct fib6_walker_t *w)
 {
 	write_lock_bh(&fib6_walker_lock);
-	w->next = fib6_walker_list.next;
-	w->prev = &fib6_walker_list;
-	w->next->prev = w;
-	w->prev->next = w;
+	list_add(&w->lh, &fib6_walkers);
 	write_unlock_bh(&fib6_walker_lock);
 }
 
 static inline void fib6_walker_unlink(struct fib6_walker_t *w)
 {
 	write_lock_bh(&fib6_walker_lock);
-	w->next->prev = w->prev;
-	w->prev->next = w->next;
-	w->prev = w->next = w;
+	list_del(&w->lh);
 	write_unlock_bh(&fib6_walker_lock);
 }
 static __inline__ u32 fib6_new_sernum(void)