net_sched: no need to free qdisc in RCU callback

gen estimator has been rewritten in commit 1c0d32fd
("net_sched: gen_estimator: complete rewrite of rate estimators"),
the caller no longer needs to wait for a grace period. So this
patch gets rid of it.

Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: NCong Wang <xiyou.wangcong@gmail.com>
Acked-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/sch_generic.h

@@ -93,7 +93,6 @@ struct Qdisc {
 	unsigned long		state;
 	struct Qdisc            *next_sched;
 	struct sk_buff		*skb_bad_txq;
-	struct rcu_head		rcu_head;
 	int			padded;
 	refcount_t		refcnt;
 

net/sched/sch_generic.c

@@ -688,10 +688,8 @@ void qdisc_reset(struct Qdisc *qdisc)
 }
 EXPORT_SYMBOL(qdisc_reset);
 
-static void qdisc_rcu_free(struct rcu_head *head)
+static void qdisc_free(struct Qdisc *qdisc)
 {
-	struct Qdisc *qdisc = container_of(head, struct Qdisc, rcu_head);
-
 	if (qdisc_is_percpu_stats(qdisc)) {
 		free_percpu(qdisc->cpu_bstats);
 		free_percpu(qdisc->cpu_qstats);
@@ -724,11 +722,7 @@ void qdisc_destroy(struct Qdisc *qdisc)
 
 	kfree_skb_list(qdisc->gso_skb);
 	kfree_skb(qdisc->skb_bad_txq);
-	/*
-	 * gen_estimator est_timer() might access qdisc->q.lock,
-	 * wait a RCU grace period before freeing qdisc.
-	 */
-	call_rcu(&qdisc->rcu_head, qdisc_rcu_free);
+	qdisc_free(qdisc);
 }
 EXPORT_SYMBOL(qdisc_destroy);