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net_sched: convert tcindex to call tcf_exts_destroy from rcu callback 

Adjust destroy path of cls_tcindex to call tcf_exts_destroy() after
rcu grace period.

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexei Starovoitov 2015-08-25 20:06:33 -07:00 committed by David S. Miller
parent faa54be4c7
commit ed7aa879ce
1 changed files with 25 additions and 4 deletions
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29
net/sched/cls_tcindex.c
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@ -27,6 +27,7 @@
struct tcindex_filter_result {
struct tcf_exts exts;
struct tcf_result res;
struct rcu_head rcu;
};
struct tcindex_filter {
@ -133,8 +134,23 @@ static int tcindex_init(struct tcf_proto *tp)
return 0;
}
static int
tcindex_delete(struct tcf_proto *tp, unsigned long arg)
static void tcindex_destroy_rexts(struct rcu_head *head)
{
struct tcindex_filter_result *r;
r = container_of(head, struct tcindex_filter_result, rcu);
tcf_exts_destroy(&r->exts);
}
static void tcindex_destroy_fexts(struct rcu_head *head)
{
struct tcindex_filter *f = container_of(head, struct tcindex_filter, rcu);
tcf_exts_destroy(&f->result.exts);
kfree(f);
}
static int tcindex_delete(struct tcf_proto *tp, unsigned long arg)
{
struct tcindex_data *p = rtnl_dereference(tp->root);
struct tcindex_filter_result *r = (struct tcindex_filter_result *) arg;
@ -162,9 +178,14 @@ tcindex_delete(struct tcf_proto *tp, unsigned long arg)
rcu_assign_pointer(*walk, rtnl_dereference(f->next));
}
tcf_unbind_filter(tp, &r->res);
tcf_exts_destroy(&r->exts);
/* all classifiers are required to call tcf_exts_destroy() after rcu
* grace period, since converted-to-rcu actions are relying on that
* in cleanup() callback
*/
if (f)
kfree_rcu(f, rcu);
call_rcu(&f->rcu, tcindex_destroy_fexts);
else
call_rcu(&r->rcu, tcindex_destroy_rexts);
return 0;
}