[B.A.T.M.A.N.] [PATCH 19/21] batman-adv: Convert batadv_orig_node_vlan to kref

Antonio Quartulli
2016-02-10T15:57:25Z

net/batman-adv/originator.c | 26 ++++++++++++++++++++------
net/batman-adv/types.h | 2 +-
2 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index bf27007a574a..8b2ef8de93e9 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -82,7 +82,7 @@ batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node,
if (tmp->vid != vid)
continue;

- if (!atomic_inc_not_zero(&tmp->refcount))
+ if (!kref_get_unless_zero(&tmp->refcount))
continue;

vlan = tmp;
@@ -123,7 +123,8 @@ batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node,
if (!vlan)
goto out;

- atomic_set(&vlan->refcount, 2);
+ kref_init(&vlan->refcount);
+ kref_get(&vlan->refcount);
vlan->vid = vid;

hlist_add_head_rcu(&vlan->list, &orig_node->vlan_list);
@@ -135,14 +136,27 @@ out:
}

/**
- * batadv_orig_node_vlan_free_ref - decrement the refcounter and possibly free
- * the originator-vlan object
+ * batadv_orig_node_vlan_release - release originator-vlan object from lists
+ * and queue for free after rcu grace period
+ * @ref: kref pointer of the originator-vlan object
+ */
+static void batadv_orig_node_vlan_release(struct kref *ref)
+{
+ struct batadv_orig_node_vlan *orig_vlan;
+
+ orig_vlan = container_of(ref, struct batadv_orig_node_vlan, refcount);
+
+ kfree_rcu(orig_vlan, rcu);
+}
+
+/**
+ * batadv_orig_node_vlan_free_ref - decrement the refcounter and possibly
+ * release the originator-vlan object
* @orig_vlan: the originator-vlan object to release
*/
void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan)
{
- if (atomic_dec_and_test(&orig_vlan->refcount))
- kfree_rcu(orig_vlan, rcu);
+ kref_put(&orig_vlan->refcount, batadv_orig_node_vlan_release);
}

int batadv_originator_init(struct batadv_priv *bat_priv)
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 74cb26372ed1..504f3dbdbcc1 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -197,7 +197,7 @@ struct batadv_orig_node_vlan {
unsigned short vid;
struct batadv_vlan_tt tt;
struct hlist_node list;