diff options
| -rw-r--r-- | net/sched/cls_api.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index 7d97f612c9b9..ddcf04b4ab43 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -336,7 +336,8 @@ static void tcf_block_put_final(struct work_struct *work) struct tcf_chain *chain, *tmp; rtnl_lock(); - /* Only chain 0 should be still here. */ + + /* At this point, all the chains should have refcnt == 1. */ list_for_each_entry_safe(chain, tmp, &block->chain_list, list) tcf_chain_put(chain); rtnl_unlock(); @@ -344,15 +345,21 @@ static void tcf_block_put_final(struct work_struct *work) } /* XXX: Standalone actions are not allowed to jump to any chain, and bound - * actions should be all removed after flushing. However, filters are now - * destroyed in tc filter workqueue with RTNL lock, they can not race here. + * actions should be all removed after flushing. */ void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q, struct tcf_block_ext_info *ei) { - struct tcf_chain *chain, *tmp; + struct tcf_chain *chain; - list_for_each_entry_safe(chain, tmp, &block->chain_list, list) + /* Hold a refcnt for all chains, except 0, so that they don't disappear + * while we are iterating. + */ + list_for_each_entry(chain, &block->chain_list, list) + if (chain->index) + tcf_chain_hold(chain); + + list_for_each_entry(chain, &block->chain_list, list) tcf_chain_flush(chain); tcf_block_offload_unbind(block, q, ei); |