[IPV4]: fib_trie RCU refinements

* This patch is from Paul McKenney's RCU reviewing.

Signed-off-by: Robert Olsson <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ipv4/fib_trie.c

···
  *		2 of the License, or (at your option) any later version.
  */
 
-#define VERSION "0.403"
+#define VERSION "0.404"
 
 #include <linux/config.h>
 #include <asm/uaccess.h>
···
   Consider a node 'n' and its parent 'tp'.
 
   If n is a leaf, every bit in its key is significant. Its presence is 
-  necessitaded by path compression, since during a tree traversal (when 
+  necessitated by path compression, since during a tree traversal (when 
   searching for a leaf - unless we are doing an insertion) we will completely 
   ignore all skipped bits we encounter. Thus we need to verify, at the end of 
   a potentially successful search, that we have indeed been walking the 
···
 #endif
 }
 
-/* readside most use rcu_read_lock currently dump routines
+/* readside must use rcu_read_lock currently dump routines
  via get_fa_head and dump */
 
-static struct leaf_info *find_leaf_info(struct hlist_head *head, int plen)
+static struct leaf_info *find_leaf_info(struct leaf *l, int plen)
 {
+	struct hlist_head *head = &l->list;
 	struct hlist_node *node;
 	struct leaf_info *li;
 
···
 
 static inline struct list_head * get_fa_head(struct leaf *l, int plen)
 {
-	struct leaf_info *li = find_leaf_info(&l->list, plen);
+	struct leaf_info *li = find_leaf_info(l, plen);
 
 	if (!li)
 		return NULL;
···
 }
 
 
-/* should be clalled with rcu_read_lock */
+/* should be called with rcu_read_lock */
 static inline int check_leaf(struct trie *t, struct leaf *l,
 			     t_key key, int *plen, const struct flowi *flp,
 			     struct fib_result *res)
···
 	rtmsg_fib(RTM_DELROUTE, htonl(key), fa, plen, tb->tb_id, nlhdr, req);
 
 	l = fib_find_node(t, key);
-	li = find_leaf_info(&l->list, plen);
+	li = find_leaf_info(l, plen);
 
 	list_del_rcu(&fa->fa_list);
 
···
 
 	t->revision++;
 
-	rcu_read_lock();
 	for (h = 0; (l = nextleaf(t, l)) != NULL; h++) {
 		found += trie_flush_leaf(t, l);
 
···
 			trie_leaf_remove(t, ll->key);
 		ll = l;
 	}
-	rcu_read_unlock();  
 
 	if (ll && hlist_empty(&ll->list))
 		trie_leaf_remove(t, ll->key);
···
 		seq_indent(seq, iter->depth);
 		seq_printf(seq, "  |-- %d.%d.%d.%d\n", NIPQUAD(val));
 		for (i = 32; i >= 0; i--) {
-			struct leaf_info *li = find_leaf_info(&l->list, i);
+			struct leaf_info *li = find_leaf_info(l, i);
 			if (li) {
 				struct fib_alias *fa;
 				list_for_each_entry_rcu(fa, &li->falh, fa_list) {
···
 		return 0;
 
 	for (i=32; i>=0; i--) {
-		struct leaf_info *li = find_leaf_info(&l->list, i);
+		struct leaf_info *li = find_leaf_info(l, i);
 		struct fib_alias *fa;
 		u32 mask, prefix;