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net_sched: remove a bogus warning in hfsc 

In update_vf():

  cftree_remove(cl);
  update_cfmin(cl->cl_parent);

the cl_cfmin of cl->cl_parent is intentionally updated to 0
when that parent only has one child. And if this parent is
root qdisc, we could end up, in hfsc_schedule_watchdog(),
that we can't decide the next schedule time for qdisc watchdog.
But it seems safe that we can just skip it, as this watchdog is
not always scheduled anyway.

Thanks to Marco for testing all the cases, nothing is broken.

Reported-by: Marco Berizzi <pupilla@libero.it>
Tested-by: Marco Berizzi <pupilla@libero.it>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2018-06-22 14:33:16 -07:00 committed by David S. Miller
parent 2ca4eb8574
commit 35b42da69e
1 changed files with 2 additions and 2 deletions
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4
net/sched/sch_hfsc.c
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@ -1385,8 +1385,8 @@ hfsc_schedule_watchdog(struct Qdisc *sch)
if (next_time == 0 || next_time > q->root.cl_cfmin)
next_time = q->root.cl_cfmin;
}
WARN_ON(next_time == 0);
qdisc_watchdog_schedule(&q->watchdog, next_time);
if (next_time)
qdisc_watchdog_schedule(&q->watchdog, next_time);
}
static int