[IPV4]: Use list.h facilities for fib_info_list.

Do not use a by-hand list implementation.
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ip_fib.h

@@ -62,8 +62,7 @@ struct fib_nh
 
 struct fib_info
 {
-	struct fib_info		*fib_next;
-	struct fib_info		*fib_prev;
+	struct list_head	fib_list;
 	int			fib_treeref;
 	atomic_t		fib_clntref;
 	int			fib_dead;

net/ipv4/fib_semantics.c

@@ -45,12 +45,12 @@
 
 #define FSprintk(a...)
 
-static struct fib_info 	*fib_info_list;
+static struct list_head fib_info_list = LIST_HEAD_INIT(fib_info_list);
 static rwlock_t fib_info_lock = RW_LOCK_UNLOCKED;
 int fib_info_cnt;
 
 #define for_fib_info() { struct fib_info *fi; \
-	for (fi = fib_info_list; fi; fi = fi->fib_next)
+	list_for_each_entry(fi, &fib_info_list, fib_list)
 
 #define endfor_fib_info() }
 
@@ -156,12 +156,7 @@ void fib_release_info(struct fib_info *fi)
 {
 	write_lock(&fib_info_lock);
 	if (fi && --fi->fib_treeref == 0) {
-		if (fi->fib_next)
-			fi->fib_next->fib_prev = fi->fib_prev;
-		if (fi->fib_prev)
-			fi->fib_prev->fib_next = fi->fib_next;
-		if (fi == fib_info_list)
-			fib_info_list = fi->fib_next;
+		list_del(&fi->fib_list);
 		fi->fib_dead = 1;
 		fib_info_put(fi);
 	}
@@ -581,11 +576,7 @@ fib_create_info(const struct rtmsg *r, struct kern_rta *rta,
 	fi->fib_treeref++;
 	atomic_inc(&fi->fib_clntref);
 	write_lock(&fib_info_lock);
-	fi->fib_next = fib_info_list;
-	fi->fib_prev = NULL;
-	if (fib_info_list)
-		fib_info_list->fib_prev = fi;
-	fib_info_list = fi;
+	list_add(&fi->fib_list, &fib_info_list);
 	write_unlock(&fib_info_lock);
 	return fi;