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| author | Al Viro <viro@zeniv.linux.org.uk> | 2018-10-08 06:22:44 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-10-08 10:33:35 -0700 |
| commit | a030598690c604c17b5288160d9d7b40274b2f79 (patch) | |
| tree | ed3755ff391624d1371be5e97db558c394bbe0f1 /net/sched | |
| parent | b245d32c995868879f361d252f32bb8a2ca33deb (diff) | |
| download | linux-a030598690c604c17b5288160d9d7b40274b2f79.tar.gz linux-a030598690c604c17b5288160d9d7b40274b2f79.tar.bz2 linux-a030598690c604c17b5288160d9d7b40274b2f79.zip | |
net: sched: cls_u32: simplify the hell out u32_delete() emptiness check
Now that we have the knode count, we can instantly check if
any hnodes are non-empty. And that kills the check for extra
references to root hnode - those could happen only if there was
a knode to carry such a link.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/cls_u32.c | 48 |
1 files changed, 1 insertions, 47 deletions
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c index 61593bee08db..ac79a40a0392 100644 --- a/net/sched/cls_u32.c +++ b/net/sched/cls_u32.c @@ -627,17 +627,6 @@ static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht, return -ENOENT; } -static bool ht_empty(struct tc_u_hnode *ht) -{ - unsigned int h; - - for (h = 0; h <= ht->divisor; h++) - if (rcu_access_pointer(ht->ht[h])) - return false; - - return true; -} - static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack) { struct tc_u_common *tp_c = tp->data; @@ -675,13 +664,9 @@ static int u32_delete(struct tcf_proto *tp, void *arg, bool *last, struct netlink_ext_ack *extack) { struct tc_u_hnode *ht = arg; - struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); struct tc_u_common *tp_c = tp->data; int ret = 0; - if (ht == NULL) - goto out; - if (TC_U32_KEY(ht->handle)) { u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack); ret = u32_delete_key(tp, (struct tc_u_knode *)ht); @@ -702,38 +687,7 @@ static int u32_delete(struct tcf_proto *tp, void *arg, bool *last, } out: - *last = true; - if (root_ht) { - if (root_ht->refcnt > 1) { - *last = false; - goto ret; - } - if (root_ht->refcnt == 1) { - if (!ht_empty(root_ht)) { - *last = false; - goto ret; - } - } - } - - if (tp_c->refcnt > 1) { - *last = false; - goto ret; - } - - if (tp_c->refcnt == 1) { - struct tc_u_hnode *ht; - - for (ht = rtnl_dereference(tp_c->hlist); - ht; - ht = rtnl_dereference(ht->next)) - if (!ht_empty(ht)) { - *last = false; - break; - } - } - -ret: + *last = tp_c->refcnt == 1 && tp_c->knodes == 0; return ret; } |