提交 1cfa2666 编写于 作者: J Jarek Poplawski 提交者: David S. Miller

pkt_sched: Add BH protection for qdisc_stab_lock.

Since qdisc_stab_lock is used in qdisc_put_stab(), which is called in
BH context from __qdisc_destroy() RCU callback, softirq safe locking
is needed.
Signed-off-by: NJarek Poplawski <jarkao2@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 0a37c10e
......@@ -331,7 +331,7 @@ static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt)
if (!s || tsize != s->tsize || (!tab && tsize > 0))
return ERR_PTR(-EINVAL);
spin_lock(&qdisc_stab_lock);
spin_lock_bh(&qdisc_stab_lock);
list_for_each_entry(stab, &qdisc_stab_list, list) {
if (memcmp(&stab->szopts, s, sizeof(*s)))
......@@ -339,11 +339,11 @@ static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt)
if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16)))
continue;
stab->refcnt++;
spin_unlock(&qdisc_stab_lock);
spin_unlock_bh(&qdisc_stab_lock);
return stab;
}
spin_unlock(&qdisc_stab_lock);
spin_unlock_bh(&qdisc_stab_lock);
stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL);
if (!stab)
......@@ -354,9 +354,9 @@ static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt)
if (tsize > 0)
memcpy(stab->data, tab, tsize * sizeof(u16));
spin_lock(&qdisc_stab_lock);
spin_lock_bh(&qdisc_stab_lock);
list_add_tail(&stab->list, &qdisc_stab_list);
spin_unlock(&qdisc_stab_lock);
spin_unlock_bh(&qdisc_stab_lock);
return stab;
}
......@@ -366,14 +366,14 @@ void qdisc_put_stab(struct qdisc_size_table *tab)
if (!tab)
return;
spin_lock(&qdisc_stab_lock);
spin_lock_bh(&qdisc_stab_lock);
if (--tab->refcnt == 0) {
list_del(&tab->list);
kfree(tab);
}
spin_unlock(&qdisc_stab_lock);
spin_unlock_bh(&qdisc_stab_lock);
}
EXPORT_SYMBOL(qdisc_put_stab);
......
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