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Date: Tue, 25 Nov 2008 10:16:56 -0800
From: Stephen Hemminger <shemminger@...tta.com>
To: David Miller <davem@...emloft.net>,
Patrick McHardy <kaber@...sh.net>
Cc: netdev@...r.kernel.org
Subject: [PATCH 1/2] tc: check for errors from gen_replace_estimator
gen_replace_estimator can return errors, but they were being ignored.
Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
--- a/net/sched/act_police.c 2008-11-25 10:02:05.000000000 -0800
+++ b/net/sched/act_police.c 2008-11-25 10:15:50.000000000 -0800
@@ -185,14 +185,21 @@ override:
if (parm->peakrate.rate) {
P_tab = qdisc_get_rtab(&parm->peakrate,
tb[TCA_POLICE_PEAKRATE]);
- if (P_tab == NULL) {
- qdisc_put_rtab(R_tab);
+ if (P_tab == NULL)
goto failure;
- }
}
}
- /* No failure allowed after this point */
+
spin_lock_bh(&police->tcf_lock);
+ if (est) {
+ err = gen_replace_estimator(&police->tcf_bstats,
+ &police->tcf_rate_est,
+ &police->tcf_lock, est);
+ if (err)
+ goto failure_unlock;
+ }
+
+ /* No failure allowed after this point */
if (R_tab != NULL) {
qdisc_put_rtab(police->tcfp_R_tab);
police->tcfp_R_tab = R_tab;
@@ -217,10 +224,6 @@ override:
if (tb[TCA_POLICE_AVRATE])
police->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
- if (est)
- gen_replace_estimator(&police->tcf_bstats,
- &police->tcf_rate_est,
- &police->tcf_lock, est);
spin_unlock_bh(&police->tcf_lock);
if (ret != ACT_P_CREATED)
@@ -238,7 +241,13 @@ override:
a->priv = police;
return ret;
+failure_unlock:
+ spin_unlock_bh(&police->tcf_lock);
failure:
+ if (P_tab)
+ qdisc_put_rtab(P_tab);
+ if (R_tab)
+ qdisc_put_rtab(R_tab);
if (ret == ACT_P_CREATED)
kfree(police);
return err;
--- a/net/sched/sch_api.c 2008-11-25 10:02:05.000000000 -0800
+++ b/net/sched/sch_api.c 2008-11-25 10:07:21.000000000 -0800
@@ -897,10 +897,10 @@ static int qdisc_change(struct Qdisc *sc
sch->stab = stab;
if (tca[TCA_RATE])
- gen_replace_estimator(&sch->bstats, &sch->rate_est,
- qdisc_root_sleeping_lock(sch),
- tca[TCA_RATE]);
- return 0;
+ err = gen_replace_estimator(&sch->bstats, &sch->rate_est,
+ qdisc_root_sleeping_lock(sch),
+ tca[TCA_RATE]);
+ return err;
}
struct check_loop_arg
--- a/net/sched/sch_cbq.c 2008-11-25 10:02:05.000000000 -0800
+++ b/net/sched/sch_cbq.c 2008-11-25 10:07:21.000000000 -0800
@@ -1806,10 +1806,10 @@ cbq_change_class(struct Qdisc *sch, u32
sch_tree_unlock(sch);
if (tca[TCA_RATE])
- gen_replace_estimator(&cl->bstats, &cl->rate_est,
- qdisc_root_sleeping_lock(sch),
- tca[TCA_RATE]);
- return 0;
+ err = gen_replace_estimator(&cl->bstats, &cl->rate_est,
+ qdisc_root_sleeping_lock(sch),
+ tca[TCA_RATE]);
+ return err;
}
if (parentid == TC_H_ROOT)
--- a/net/sched/sch_drr.c 2008-11-25 10:02:05.000000000 -0800
+++ b/net/sched/sch_drr.c 2008-11-25 10:07:21.000000000 -0800
@@ -88,10 +88,10 @@ static int drr_change_class(struct Qdisc
sch_tree_unlock(sch);
if (tca[TCA_RATE])
- gen_replace_estimator(&cl->bstats, &cl->rate_est,
- qdisc_root_sleeping_lock(sch),
- tca[TCA_RATE]);
- return 0;
+ err = gen_replace_estimator(&cl->bstats, &cl->rate_est,
+ qdisc_root_sleeping_lock(sch),
+ tca[TCA_RATE]);
+ return err;
}
cl = kzalloc(sizeof(struct drr_class), GFP_KERNEL);
@@ -106,10 +106,15 @@ static int drr_change_class(struct Qdisc
if (cl->qdisc == NULL)
cl->qdisc = &noop_qdisc;
- if (tca[TCA_RATE])
- gen_replace_estimator(&cl->bstats, &cl->rate_est,
- qdisc_root_sleeping_lock(sch),
- tca[TCA_RATE]);
+ if (tca[TCA_RATE]) {
+ err = gen_replace_estimator(&cl->bstats, &cl->rate_est,
+ qdisc_root_sleeping_lock(sch),
+ tca[TCA_RATE]);
+ if (err) {
+ kfree(cl);
+ return err;
+ }
+ }
sch_tree_lock(sch);
qdisc_class_hash_insert(&q->clhash, &cl->common);
--- a/net/sched/sch_hfsc.c 2008-11-25 10:02:05.000000000 -0800
+++ b/net/sched/sch_hfsc.c 2008-11-25 10:07:21.000000000 -0800
@@ -1035,10 +1035,10 @@ hfsc_change_class(struct Qdisc *sch, u32
sch_tree_unlock(sch);
if (tca[TCA_RATE])
- gen_replace_estimator(&cl->bstats, &cl->rate_est,
+ err = gen_replace_estimator(&cl->bstats, &cl->rate_est,
qdisc_root_sleeping_lock(sch),
tca[TCA_RATE]);
- return 0;
+ return err;
}
if (parentid == TC_H_ROOT)
--
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