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Diffstat (limited to 'net/sched/act_police.c')
-rw-r--r--net/sched/act_police.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/net/sched/act_police.c b/net/sched/act_police.c
index 654f73dff7c..537a48732e9 100644
--- a/net/sched/act_police.c
+++ b/net/sched/act_police.c
@@ -97,6 +97,11 @@ nla_put_failure:
goto done;
}
+static void tcf_police_free_rcu(struct rcu_head *head)
+{
+ kfree(container_of(head, struct tcf_police, tcf_rcu));
+}
+
static void tcf_police_destroy(struct tcf_police *p)
{
unsigned int h = tcf_hash(p->tcf_index, POL_TAB_MASK);
@@ -113,7 +118,11 @@ static void tcf_police_destroy(struct tcf_police *p)
qdisc_put_rtab(p->tcfp_R_tab);
if (p->tcfp_P_tab)
qdisc_put_rtab(p->tcfp_P_tab);
- kfree(p);
+ /*
+ * gen_estimator est_timer() might access p->tcf_lock
+ * or bstats, wait a RCU grace period before freeing p
+ */
+ call_rcu(&p->tcf_rcu, tcf_police_free_rcu);
return;
}
}
@@ -397,6 +406,7 @@ static void __exit
police_cleanup_module(void)
{
tcf_unregister_action(&act_police_ops);
+ rcu_barrier(); /* Wait for completion of call_rcu()'s (tcf_police_free_rcu) */
}
module_init(police_init_module);