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authorPatrick McHardy <kaber@trash.net>2008-11-20 04:11:36 -0800
committerDavid S. Miller <davem@davemloft.net>2008-11-20 04:11:36 -0800
commitb94c8afcba3ae6584653b98e315446ea83be6ea5 (patch)
tree377fcfaf74e3aa38243c736a440e45b378355d8e /net/sched/sch_tbf.c
parentc19d0369d4c791d90fe0b84d6040a897fe25cc14 (diff)
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>
Diffstat (limited to 'net/sched/sch_tbf.c')
-rw-r--r--net/sched/sch_tbf.c17
1 files changed, 13 insertions, 4 deletions
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);