ipv4: fib_trie: Fix lookup error return

In commit a07f5f508a4d9728c8e57d7f66294bf5b254ff7f "[IPV4] fib_trie: style
cleanup", the changes to check_leaf() and fn_trie_lookup() were wrong - where
fn_trie_lookup() would previously return a negative error value from
check_leaf(), it now returns 0.

Now fn_trie_lookup() doesn't appear to care about plen, so we can revert
check_leaf() to returning the error value.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Tested-by: William Boughton <bill@boughton.de>
Acked-by: Stephen Heminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 4b02d14e7ab9685cece9fa1565e528132313eb26..e1600ad8fb0e44fbd33657589ba84040b0ac8333 100644 (file)
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1359,17 +1359,17 @@ static int check_leaf(struct trie *t, struct leaf *l,
                        t->stats.semantic_match_miss++;
 #endif
                if (err <= 0)
-                       return plen;
+                       return err;
        }
 
-       return -1;
+       return 1;
 }
 
 static int fn_trie_lookup(struct fib_table *tb, const struct flowi *flp,
                          struct fib_result *res)
 {
        struct trie *t = (struct trie *) tb->tb_data;
-       int plen, ret = 0;
+       int ret;
        struct node *n;
        struct tnode *pn;
        int pos, bits;
@@ -1393,10 +1393,7 @@ static int fn_trie_lookup(struct fib_table *tb, const struct flowi *flp,
 
        /* Just a leaf? */
        if (IS_LEAF(n)) {
-               plen = check_leaf(t, (struct leaf *)n, key, flp, res);
-               if (plen < 0)
-                       goto failed;
-               ret = 0;
+               ret = check_leaf(t, (struct leaf *)n, key, flp, res);
                goto found;
        }
 
@@ -1421,11 +1418,9 @@ static int fn_trie_lookup(struct fib_table *tb, const struct flowi *flp,
                }
 
                if (IS_LEAF(n)) {
-                       plen = check_leaf(t, (struct leaf *)n, key, flp, res);
-                       if (plen < 0)
+                       ret = check_leaf(t, (struct leaf *)n, key, flp, res);
+                       if (ret > 0)
                                goto backtrace;
-
-                       ret = 0;
                        goto found;
                }