From 5e50da01d0ce7ef0ba3ed6cfabd62f327da0aca6 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Wed, 29 Nov 2006 17:36:20 -0800 Subject: [PATCH] [NET_SCHED]: Fix endless loops (part 2): "simple" qdiscs Convert the "simple" qdiscs to use qdisc_tree_decrease_qlen() where necessary: - all graft operations - destruction of old child qdiscs in prio, red and tbf change operation - purging of queue in sfq change operation Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/sched/sch_cbq.c | 2 +- net/sched/sch_dsmark.c | 2 +- net/sched/sch_netem.c | 2 +- net/sched/sch_prio.c | 11 ++++++++--- net/sched/sch_red.c | 6 ++++-- net/sched/sch_sfq.c | 3 +++ net/sched/sch_tbf.c | 6 ++++-- 7 files changed, 22 insertions(+), 10 deletions(-) diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c index 908b10d0d61f..ba82dfab6043 100644 --- a/net/sched/sch_cbq.c +++ b/net/sched/sch_cbq.c @@ -1687,7 +1687,7 @@ static int cbq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, sch_tree_lock(sch); *old = cl->q; cl->q = new; - sch->q.qlen -= (*old)->q.qlen; + qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); qdisc_reset(*old); sch_tree_unlock(sch); diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c index afedd92b7496..d5421816f007 100644 --- a/net/sched/sch_dsmark.c +++ b/net/sched/sch_dsmark.c @@ -96,8 +96,8 @@ static int dsmark_graft(struct Qdisc *sch, unsigned long arg, sch_tree_lock(sch); *old = xchg(&p->q, new); + qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); qdisc_reset(*old); - sch->q.qlen = 0; sch_tree_unlock(sch); return 0; diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c index 90aeeb7b7167..672c35445793 100644 --- a/net/sched/sch_netem.c +++ b/net/sched/sch_netem.c @@ -662,8 +662,8 @@ static int netem_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, sch_tree_lock(sch); *old = xchg(&q->qdisc, new); + qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); qdisc_reset(*old); - sch->q.qlen = 0; sch_tree_unlock(sch); return 0; diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c index 3fc0c0fa5bcc..2567b4c96c1e 100644 --- a/net/sched/sch_prio.c +++ b/net/sched/sch_prio.c @@ -222,8 +222,10 @@ static int prio_tune(struct Qdisc *sch, struct rtattr *opt) for (i=q->bands; iqueues[i], &noop_qdisc); - if (child != &noop_qdisc) + if (child != &noop_qdisc) { + qdisc_tree_decrease_qlen(child, child->q.qlen); qdisc_destroy(child); + } } sch_tree_unlock(sch); @@ -236,8 +238,11 @@ static int prio_tune(struct Qdisc *sch, struct rtattr *opt) sch_tree_lock(sch); child = xchg(&q->queues[i], child); - if (child != &noop_qdisc) + if (child != &noop_qdisc) { + qdisc_tree_decrease_qlen(child, + child->q.qlen); qdisc_destroy(child); + } sch_tree_unlock(sch); } } @@ -295,7 +300,7 @@ static int prio_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, sch_tree_lock(sch); *old = q->queues[band]; q->queues[band] = new; - sch->q.qlen -= (*old)->q.qlen; + qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); qdisc_reset(*old); sch_tree_unlock(sch); diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c index ee66c5ca80c6..acddad08850f 100644 --- a/net/sched/sch_red.c +++ b/net/sched/sch_red.c @@ -229,8 +229,10 @@ static int red_change(struct Qdisc *sch, struct rtattr *opt) sch_tree_lock(sch); q->flags = ctl->flags; q->limit = ctl->limit; - if (child) + if (child) { + qdisc_tree_decrease_qlen(q->qdisc, q->qdisc->q.qlen); qdisc_destroy(xchg(&q->qdisc, child)); + } red_set_parms(&q->parms, ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Plog, ctl->Scell_log, @@ -308,8 +310,8 @@ static int red_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, sch_tree_lock(sch); *old = xchg(&q->qdisc, new); + qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); qdisc_reset(*old); - sch->q.qlen = 0; sch_tree_unlock(sch); return 0; } diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c index d0d6e595a78c..459cda258a5c 100644 --- a/net/sched/sch_sfq.c +++ b/net/sched/sch_sfq.c @@ -393,6 +393,7 @@ static int sfq_change(struct Qdisc *sch, struct rtattr *opt) { struct sfq_sched_data *q = qdisc_priv(sch); struct tc_sfq_qopt *ctl = RTA_DATA(opt); + unsigned int qlen; if (opt->rta_len < RTA_LENGTH(sizeof(*ctl))) return -EINVAL; @@ -403,8 +404,10 @@ static int sfq_change(struct Qdisc *sch, struct rtattr *opt) if (ctl->limit) q->limit = min_t(u32, ctl->limit, SFQ_DEPTH); + qlen = sch->q.qlen; while (sch->q.qlen >= q->limit-1) sfq_drop(sch); + qdisc_tree_decrease_qlen(sch, qlen - sch->q.qlen); del_timer(&q->perturb_timer); if (q->perturb_period) { diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c index 2562a6040b76..23b7624354f5 100644 --- a/net/sched/sch_tbf.c +++ b/net/sched/sch_tbf.c @@ -348,8 +348,10 @@ static int tbf_change(struct Qdisc* sch, struct rtattr *opt) } sch_tree_lock(sch); - if (child) + if (child) { + qdisc_tree_decrease_qlen(q->qdisc, q->qdisc->q.qlen); qdisc_destroy(xchg(&q->qdisc, child)); + } q->limit = qopt->limit; q->mtu = qopt->mtu; q->max_size = max_size; @@ -451,8 +453,8 @@ static int tbf_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, sch_tree_lock(sch); *old = xchg(&q->qdisc, new); + qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); qdisc_reset(*old); - sch->q.qlen = 0; sch_tree_unlock(sch); return 0; -- 2.39.5