[PATCH net-next,RFC 5/9] net: sched: add release callback to struct tcf_block_cb

[Pablo Neira Ayuso <pablo@netfilter.org>]

Call it on tcf_block_cb object to release the private area.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 include/net/pkt_cls.h |  3 ++-
 net/sched/cls_api.c   | 10 ++++++++--
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index d40fcd8c502b..52a6484428ce 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -72,7 +72,8 @@ static inline struct Qdisc *tcf_block_q(struct tcf_block *block)
 }
 
 struct tcf_block_cb *tcf_block_cb_alloc(tc_setup_cb_t *cb,
-					void *cb_ident, void *cb_priv);
+					void *cb_ident, void *cb_priv,
+					void (*release)(void *cb_priv));
 void tcf_block_cb_free(struct tcf_block_cb *block_cb);
 void tcf_block_cb_list_add(struct tcf_block_cb *block_cb, struct list_head *cb_list);
 void tcf_block_cb_list_move(struct tcf_block_cb *block_cb, struct list_head *cb_list);
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 3c16ac802dc4..963511ec758d 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -711,6 +711,7 @@ struct tcf_block_cb {
 	struct list_head global_list;
 	struct list_head list;
 	tc_setup_cb_t *cb;
+	void (*release)(void *cb_priv);
 	void *cb_ident;
 	void *cb_priv;
 	unsigned int refcnt;
@@ -753,7 +754,8 @@ unsigned int tcf_block_cb_decref(struct tcf_block_cb *block_cb)
 EXPORT_SYMBOL(tcf_block_cb_decref);
 
 struct tcf_block_cb *tcf_block_cb_alloc(tc_setup_cb_t *cb,
-					void *cb_ident, void *cb_priv)
+					void *cb_ident, void *cb_priv,
+					void (*release)(void *cb_priv))
 {
 	struct tcf_block_cb *block_cb;
 
@@ -763,6 +765,7 @@ struct tcf_block_cb *tcf_block_cb_alloc(tc_setup_cb_t *cb,
 
 	block_cb->cb = cb;
 	block_cb->cb_ident = cb_ident;
+	block_cb->release = release;
 	block_cb->cb_priv = cb_priv;
 
 	return block_cb;
@@ -771,6 +774,9 @@ EXPORT_SYMBOL(tcf_block_cb_alloc);
 
 void tcf_block_cb_free(struct tcf_block_cb *block_cb)
 {
+	if (block_cb->release)
+		block_cb->release(block_cb->cb_priv);
+
 	kfree(block_cb);
 }
 EXPORT_SYMBOL(tcf_block_cb_free);
@@ -804,7 +810,7 @@ struct tcf_block_cb *__tcf_block_cb_register(struct tcf_block *block,
 	if (err)
 		return ERR_PTR(err);
 
-	block_cb = tcf_block_cb_alloc(cb, cb_ident, cb_priv);
+	block_cb = tcf_block_cb_alloc(cb, cb_ident, cb_priv, NULL);
 	if (!block_cb)
 		return ERR_PTR(-ENOMEM);
 
-- 
2.11.0