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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>
This commit is contained in:
Patrick McHardy 2008-11-20 04:11:36 -08:00 committed by David S. Miller
parent c19d0369d4
commit b94c8afcba
11 changed files with 52 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
net/sched/sch_atm.c
View File

@ -102,7 +102,8 @@ static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
return -EINVAL;
if (!new)
new = &noop_qdisc;
*old = xchg(&flow->q, new);
*old = flow->q;
flow->q = new;
if (*old)
qdisc_reset(*old);
return 0;

7
net/sched/sch_cbq.c
View File

@ -1635,7 +1635,8 @@ static int cbq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
#endif
}
sch_tree_lock(sch);
*old = xchg(&cl->q, new);
*old = cl->q;
cl->q = new;
qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
qdisc_reset(*old);
sch_tree_unlock(sch);
@ -1776,8 +1777,8 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t
cbq_deactivate_class(cl);
if (rtab) {
rtab = xchg(&cl->R_tab, rtab);
qdisc_put_rtab(rtab);
qdisc_put_rtab(cl->R_tab);
cl->R_tab = rtab;
}
if (tb[TCA_CBQ_LSSOPT])

3
net/sched/sch_drr.c
View File

@ -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;
}

3
net/sched/sch_dsmark.c
View File

@ -68,7 +68,8 @@ static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
}
sch_tree_lock(sch);
*old = xchg(&p->q, new);
*old = p->q;
p->q = new;
qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
qdisc_reset(*old);
sch_tree_unlock(sch);

3
net/sched/sch_hfsc.c
View File

@ -1202,7 +1202,8 @@ hfsc_graft_class(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
sch_tree_lock(sch);
hfsc_purge_queue(sch, cl);
*old = xchg(&cl->qdisc, new);
*old = cl->qdisc;
cl->qdisc = new;
sch_tree_unlock(sch);
return 0;
}

4
net/sched/sch_htb.c
View File

@ -1100,7 +1100,9 @@ static int htb_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
== NULL)
return -ENOBUFS;
sch_tree_lock(sch);
if ((*old = xchg(&cl->un.leaf.q, new)) != NULL) {
*old = cl->un.leaf.q;
cl->un.leaf.q = new;
if (*old != NULL) {
qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
qdisc_reset(*old);
}

16
net/sched/sch_multiq.c
View File

@ -214,7 +214,8 @@ static int multiq_tune(struct Qdisc *sch, struct nlattr *opt)
q->bands = qopt->bands;
for (i = q->bands; i < q->max_bands; i++) {
if (q->queues[i] != &noop_qdisc) {
struct Qdisc *child = xchg(&q->queues[i], &noop_qdisc);
struct Qdisc *child = q->queues[i];
q->queues[i] = &noop_qdisc;
qdisc_tree_decrease_qlen(child, child->q.qlen);
qdisc_destroy(child);
}
@ -224,7 +225,7 @@ static int multiq_tune(struct Qdisc *sch, struct nlattr *opt)
for (i = 0; i < q->bands; i++) {
if (q->queues[i] == &noop_qdisc) {
struct Qdisc *child;
struct Qdisc *child, *old;
child = qdisc_create_dflt(qdisc_dev(sch),
sch->dev_queue,
&pfifo_qdisc_ops,
@ -232,12 +233,13 @@ static int multiq_tune(struct Qdisc *sch, struct nlattr *opt)
i + 1));
if (child) {
sch_tree_lock(sch);
child = xchg(&q->queues[i], child);
old = q->queues[i];
q->queues[i] = child;
if (child != &noop_qdisc) {
qdisc_tree_decrease_qlen(child,
child->q.qlen);
qdisc_destroy(child);
if (old != &noop_qdisc) {
qdisc_tree_decrease_qlen(old,
old->q.qlen);
qdisc_destroy(old);
}
sch_tree_unlock(sch);
}

5
net/sched/sch_netem.c
View File

@ -331,10 +331,9 @@ static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr)
root_lock = qdisc_root_sleeping_lock(sch);
spin_lock_bh(root_lock);
d = xchg(&q->delay_dist, d);
kfree(q->delay_dist);
q->delay_dist = d;
spin_unlock_bh(root_lock);
kfree(d);
return 0;
}

16
net/sched/sch_prio.c
View File

@ -187,7 +187,8 @@ static int prio_tune(struct Qdisc *sch, struct nlattr *opt)
memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1);
for (i=q->bands; i<TCQ_PRIO_BANDS; i++) {
struct Qdisc *child = xchg(&q->queues[i], &noop_qdisc);
struct Qdisc *child = q->queues[i];
q->queues[i] = &noop_qdisc;
if (child != &noop_qdisc) {
qdisc_tree_decrease_qlen(child, child->q.qlen);
qdisc_destroy(child);
@ -197,18 +198,19 @@ static int prio_tune(struct Qdisc *sch, struct nlattr *opt)
for (i=0; i<q->bands; i++) {
if (q->queues[i] == &noop_qdisc) {
struct Qdisc *child;
struct Qdisc *child, *old;
child = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
&pfifo_qdisc_ops,
TC_H_MAKE(sch->handle, i + 1));
if (child) {
sch_tree_lock(sch);
child = xchg(&q->queues[i], child);
old = q->queues[i];
q->queues[i] = child;
if (child != &noop_qdisc) {
qdisc_tree_decrease_qlen(child,
child->q.qlen);
qdisc_destroy(child);
if (old != &noop_qdisc) {
qdisc_tree_decrease_qlen(old,
old->q.qlen);
qdisc_destroy(old);
}
sch_tree_unlock(sch);
}

6
net/sched/sch_red.c
View File

@ -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);

17
net/sched/sch_tbf.c
View File

@ -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);