Re: [PATCH net] net_sched: fix pfifo_head_drop behavior vs backlog

From: Eric Dumazet <redacted>
Date: Sun, 12 Jun 2016 20:01:25 -0700

From: Eric Dumazet <edumazet@google.com>

When the qdisc is full, we drop a packet at the head of the queue,
queue the current skb and return NET_XMIT_CN

Now we track backlog on upper qdiscs, we need to call
qdisc_tree_reduce_backlog(), even if the qlen did not change.

Fixes: 2ccccf5fb43f ("net_sched: update hierarchical backlog too")
Signed-off-by: Eric Dumazet <edumazet@google.com>

Applied and queued up for -stable, thanks.