pkt_sched: remove unnecessary xchg() in packet schedulers

The use of xchg() hasn't been necessary since 2.2.something when proper
locking was added to packet schedulers.

Signed-off-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_red.c b/net/sched/sch_red.c
index 6a0371c22643..2bdf241f6315 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -202,7 +202,8 @@ static int red_change(struct Qdisc *sch, struct nlattr *opt)
         q->limit = ctl->limit;
         if (child) {
                 qdisc_tree_decrease_qlen(q->qdisc, q->qdisc->q.qlen);
-                qdisc_destroy(xchg(&q->qdisc, child));
+                qdisc_destroy(q->qdisc);
+                q->qdisc = child;
         }
 
         red_set_parms(&q->parms, ctl->qth_min, ctl->qth_max, ctl->Wlog,
@@ -283,7 +284,8 @@ static int red_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
                 new = &noop_qdisc;
 
         sch_tree_lock(sch);
-        *old = xchg(&q->qdisc, new);
+        *old = q->qdisc;
+        q->qdisc = new;
         qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
         qdisc_reset(*old);
         sch_tree_unlock(sch);