[NET]: Fix prio_tune() handling of root qdisc.

Fix the check in prio_tune() to see if sch->parent is TC_H_ROOT instead of
sch->handle to load or reject the qdisc for multiqueue devices.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 71bafde353a6..4a49db65772e 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -238,11 +238,13 @@ static int prio_tune(struct Qdisc *sch, struct rtattr *opt)
         /* If we're multiqueue, make sure the number of incoming bands
          * matches the number of queues on the device we're associating with.
          * If the number of bands requested is zero, then set q->bands to
-         * dev->egress_subqueue_count.
+         * dev->egress_subqueue_count.  Also, the root qdisc must be the
+         * only one that is enabled for multiqueue, since it's the only one
+         * that interacts with the underlying device.
          */
         q->mq = RTA_GET_FLAG(tb[TCA_PRIO_MQ - 1]);
         if (q->mq) {
-                if (sch->handle != TC_H_ROOT)
+                if (sch->parent != TC_H_ROOT)
                         return -EINVAL;
                 if (netif_is_multiqueue(sch->dev)) {
                         if (q->bands == 0)