1 files changed, 34 insertions, 4 deletions

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 433604bb3fe8..3c8728aaab4e 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -23,11 +23,17 @@ struct qdisc_rate_table {
 };
 
 enum qdisc_state_t {
-        __QDISC_STATE_RUNNING,
         __QDISC_STATE_SCHED,
         __QDISC_STATE_DEACTIVATED,
 };
 
+/*
+ * following bits are only changed while qdisc lock is held
+ */
+enum qdisc___state_t {
+        __QDISC___STATE_RUNNING,
+};
+
 struct qdisc_size_table {
         struct list_head        list;
         struct tc_sizespec      szopts;
@@ -72,10 +78,27 @@ struct Qdisc {
         unsigned long           state;
         struct sk_buff_head     q;
         struct gnet_stats_basic_packed bstats;
+        unsigned long           __state;
         struct gnet_stats_queue qstats;
-        struct rcu_head     rcu_head;
+        struct rcu_head         rcu_head;
+        spinlock_t              busylock;
 };
 
+static inline bool qdisc_is_running(struct Qdisc *qdisc)
+{
+        return test_bit(__QDISC___STATE_RUNNING, &qdisc->__state);
+}
+
+static inline bool qdisc_run_begin(struct Qdisc *qdisc)
+{
+        return !__test_and_set_bit(__QDISC___STATE_RUNNING, &qdisc->__state);
+}
+
+static inline void qdisc_run_end(struct Qdisc *qdisc)
+{
+        __clear_bit(__QDISC___STATE_RUNNING, &qdisc->__state);
+}
+
 struct Qdisc_class_ops {
         /* Child qdisc manipulation */
         struct netdev_queue *   (*select_queue)(struct Qdisc *, struct tcmsg *);
@@ -583,9 +606,16 @@ static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
 }
 
 #ifdef CONFIG_NET_CLS_ACT
-static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
+static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
+                                            int action)
 {
-        struct sk_buff *n = skb_clone(skb, gfp_mask);
+        struct sk_buff *n;
+
+        if ((action == TC_ACT_STOLEN || action == TC_ACT_QUEUED) &&
+            !skb_shared(skb))
+                n = skb_get(skb);
+        else
+                n = skb_clone(skb, gfp_mask);
 
         if (n) {
                 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);