diff options
| -rw-r--r-- | net/sched/cls_api.c | 37 |
1 files changed, 8 insertions, 29 deletions
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index 231181c602ed..b2d310745487 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -280,8 +280,8 @@ static void tcf_block_put_final(struct work_struct *work) struct tcf_block *block = container_of(work, struct tcf_block, work); struct tcf_chain *chain, *tmp; - /* At this point, all the chains should have refcnt == 1. */ rtnl_lock(); + /* Only chain 0 should be still here. */ list_for_each_entry_safe(chain, tmp, &block->chain_list, list) tcf_chain_put(chain); rtnl_unlock(); @@ -289,23 +289,17 @@ 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 destroyed - * in RCU callbacks, we have to hold the chains first, otherwise we would - * always race with RCU callbacks on this list without proper locking. + * actions should be all removed after flushing. However, filters are now + * destroyed in tc filter workqueue with RTNL lock, they can not race here. */ -static void tcf_block_put_deferred(struct work_struct *work) +void tcf_block_put(struct tcf_block *block) { - struct tcf_block *block = container_of(work, struct tcf_block, work); - struct tcf_chain *chain; + struct tcf_chain *chain, *tmp; - rtnl_lock(); - /* Hold a refcnt for all chains, except 0, in case they are gone. */ - list_for_each_entry(chain, &block->chain_list, list) - if (chain->index) - tcf_chain_hold(chain); + if (!block) + return; - /* No race on the list, because no chain could be destroyed. */ - list_for_each_entry(chain, &block->chain_list, list) + list_for_each_entry_safe(chain, tmp, &block->chain_list, list) tcf_chain_flush(chain); INIT_WORK(&block->work, tcf_block_put_final); @@ -314,21 +308,6 @@ static void tcf_block_put_deferred(struct work_struct *work) */ rcu_barrier(); tcf_queue_work(&block->work); - rtnl_unlock(); -} - -void tcf_block_put(struct tcf_block *block) -{ - if (!block) - return; - - INIT_WORK(&block->work, tcf_block_put_deferred); - /* Wait for existing RCU callbacks to cool down, make sure their works - * have been queued before this. We can not flush pending works here - * because we are holding the RTNL lock. - */ - rcu_barrier(); - tcf_queue_work(&block->work); } EXPORT_SYMBOL(tcf_block_put); |