From b94c8afcba3ae6584653b98e315446ea83be6ea5 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Thu, 20 Nov 2008 04:11:36 -0800 Subject: 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 Signed-off-by: David S. Miller --- net/sched/sch_tbf.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) (limited to 'net/sched/sch_tbf.c') diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c index bb7783d584b..a2f93c09f3c 100644 --- a/net/sched/sch_tbf.c +++ b/net/sched/sch_tbf.c @@ -236,6 +236,7 @@ static int tbf_change(struct Qdisc* sch, struct nlattr *opt) struct tc_tbf_qopt *qopt; struct qdisc_rate_table *rtab = NULL; struct qdisc_rate_table *ptab = NULL; + struct qdisc_rate_table *tmp; struct Qdisc *child = NULL; int max_size,n; @@ -284,7 +285,8 @@ static int tbf_change(struct Qdisc* sch, struct nlattr *opt) sch_tree_lock(sch); 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; } q->limit = qopt->limit; q->mtu = qopt->mtu; @@ -292,8 +294,14 @@ static int tbf_change(struct Qdisc* sch, struct nlattr *opt) q->buffer = qopt->buffer; q->tokens = q->buffer; q->ptokens = q->mtu; - rtab = xchg(&q->R_tab, rtab); - ptab = xchg(&q->P_tab, ptab); + + tmp = q->R_tab; + q->R_tab = rtab; + rtab = tmp; + + tmp = q->P_tab; + q->P_tab = ptab; + ptab = tmp; sch_tree_unlock(sch); err = 0; done: @@ -383,7 +391,8 @@ static int tbf_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); -- cgit v1.2.3