Merge branch 'linus' into x86/asm, to pick up fixes and resolve conflicts

Conflicts:
	arch/x86/kernel/cpu/Makefile

Signed-off-by: Ingo Molnar <mingo@kernel.org>

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);