[PATCH] net_sched: fix order of queue length updates in qdisc_replace()

[Konstantin Khlebnikov]

This important to call qdisc_tree_reduce_backlog() after changing queue
length. Parent qdisc should deactivate class in ->qlen_notify() called from
qdisc_tree_reduce_backlog() but this happens only if qdisc->q.qlen in zero.

Missed class deactivations leads to crashes/warnings at picking packets
from empty qdisc and corrupting state at reactivating this class in future.

Signed-off-by: Konstantin Khlebnikov <khlebni...@yandex-team.ru>
Fixes: 86a7996cc8a0 ("net_sched: introduce qdisc_replace() helper")
Cc: Stable <sta...@vger.kernel.org>
---
 include/net/sch_generic.h |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 1c123e2b2415..67f815e5d525 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -806,8 +806,11 @@ static inline struct Qdisc *qdisc_replace(struct Qdisc 
*sch, struct Qdisc *new,
        old = *pold;
        *pold = new;
        if (old != NULL) {
-               qdisc_tree_reduce_backlog(old, old->q.qlen, 
old->qstats.backlog);
+               unsigned int qlen = old->q.qlen;
+               unsigned int backlog = old->qstats.backlog;
+
                qdisc_reset(old);
+               qdisc_tree_reduce_backlog(old, qlen, backlog);
        }
        sch_tree_unlock(sch);