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, 2 insertions, 1 deletions

diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
index e71a5de23e2..8d523d9b636 100644
--- a/net/sched/sch_drr.c
+++ b/net/sched/sch_drr.c
@@ -208,7 +208,8 @@ static int drr_graft_class(struct Qdisc *sch, unsigned long arg,
 
         sch_tree_lock(sch);
         drr_purge_queue(cl);
-        *old = xchg(&cl->qdisc, new);
+        *old = cl->qdisc;
+        cl->qdisc = new;
         sch_tree_unlock(sch);
         return 0;
 }