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net: sched: tbf: don't call qdisc_put() while holding tree lock

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The issue is the same to commit c2999f7fb0 ("net: sched: multiq: don't
call qdisc_put() while holding tree lock"). Qdiscs call qdisc_put() while
holding sch tree spinlock, which results sleeping-while-atomic BUG.

Fixes: c266f64dbf ("net: sched: protect block state with mutex")
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Link: https://lore.kernel.org/r/20220826013930.340121-1-shaozhengchao@huawei.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Zhengchao Shao 2022-08-26 09:39:30 +08:00 • committed by Paolo Abeni
parent cb10b0f91c
commit b05972f01e
1 changed files with 3 additions and 1 deletions
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4
net/sched/sch_tbf.c
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@ -356,6 +356,7 @@ static int tbf_change(struct Qdisc *sch, struct nlattr *opt,
struct nlattr *tb[TCA_TBF_MAX + 1]; struct nlattr *tb[TCA_TBF_MAX + 1];
struct tc_tbf_qopt *qopt; struct tc_tbf_qopt *qopt;
struct Qdisc *child = NULL; struct Qdisc *child = NULL;
struct Qdisc *old = NULL;
struct psched_ratecfg rate; struct psched_ratecfg rate;
struct psched_ratecfg peak; struct psched_ratecfg peak;
u64 max_size; u64 max_size;
@ -447,7 +448,7 @@ static int tbf_change(struct Qdisc *sch, struct nlattr *opt,
sch_tree_lock(sch); sch_tree_lock(sch);
if (child) { if (child) {
qdisc_tree_flush_backlog(q->qdisc); qdisc_tree_flush_backlog(q->qdisc);
qdisc_put(q->qdisc); old = q->qdisc;
q->qdisc = child; q->qdisc = child;
} }
q->limit = qopt->limit; q->limit = qopt->limit;
@ -467,6 +468,7 @@ static int tbf_change(struct Qdisc *sch, struct nlattr *opt,
memcpy(&q->peak, &peak, sizeof(struct psched_ratecfg)); memcpy(&q->peak, &peak, sizeof(struct psched_ratecfg));
sch_tree_unlock(sch); sch_tree_unlock(sch);
qdisc_put(old);
err = 0; err = 0;
tbf_offload_change(sch); tbf_offload_change(sch);