[IPV4]: fib_trie RCU refinements

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

Signed-off-by: Robert Olsson <robert.olsson@its.uu.se>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 11 deletions

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 3dd70787081e..90ae70870a10 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -43,7 +43,7 @@
  *              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>
@@ -224,7 +224,7 @@ static inline int tkey_mismatch(t_key a, int offset, t_key b)
   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 
@@ -836,11 +836,12 @@ static void trie_init(struct trie *t)
 #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;
 
@@ -853,7 +854,7 @@ static struct leaf_info *find_leaf_info(struct hlist_head *head, int plen)
 
 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;
@@ -1248,7 +1249,7 @@ err:
 }
 
 
-/* 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)
@@ -1590,7 +1591,7 @@ fn_trie_delete(struct fib_table *tb, struct rtmsg *r, struct kern_rta *rta,
         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);
 
@@ -1714,7 +1715,6 @@ static int fn_trie_flush(struct fib_table *tb)
 
         t->revision++;
 
-        rcu_read_lock();
         for (h = 0; (l = nextleaf(t, l)) != NULL; h++) {
                 found += trie_flush_leaf(t, l);
 
@@ -1722,7 +1722,6 @@ static int fn_trie_flush(struct fib_table *tb)
                         trie_leaf_remove(t, ll->key);
                 ll = l;
         }
-        rcu_read_unlock();  
 
         if (ll && hlist_empty(&ll->list))
                 trie_leaf_remove(t, ll->key);
@@ -2288,7 +2287,7 @@ static int fib_trie_seq_show(struct seq_file *seq, void *v)
                 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) {
@@ -2384,7 +2383,7 @@ static int fib_route_seq_show(struct seq_file *seq, void *v)
                 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;