[NET_SCHED]: Eliminate qdisc_tree_lock

Since we're now holding the rtnl during the entire dump operation, we
can remove qdisc_tree_lock, whose only purpose is to protect dump
callbacks from concurrent changes to the qdisc tree.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 0 insertions, 2 deletions

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index ca3da5013b7a..ebf94edf0478 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -400,7 +400,6 @@ static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
         if ((dev = dev_get_by_index(tcm->tcm_ifindex)) == NULL)
                 return skb->len;
 
-        read_lock(&qdisc_tree_lock);
         if (!tcm->tcm_parent)
                 q = dev->qdisc_sleeping;
         else
@@ -457,7 +456,6 @@ errout:
         if (cl)
                 cops->put(q, cl);
 out:
-        read_unlock(&qdisc_tree_lock);
         dev_put(dev);
         return skb->len;
 }