Repository : ssh://git@open-mesh.org/batman-adv
On branch : master
commit 33b1d7c88a2556e916ce4e95d7ea36d80583c270 Author: Sven Eckelmann sven@narfation.org Date: Sat Jan 16 10:29:55 2016 +0100
batman-adv: Convert batadv_orig_node_vlan to kref
batman-adv uses a self-written reference implementation which is just based on atomic_t. This is less obvious when reading the code than kref and therefore increases the change that the reference counting will be missed.
Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Marek Lindner mareklindner@neomailbox.ch
33b1d7c88a2556e916ce4e95d7ea36d80583c270 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 bf27007..8b2ef8d 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 74cb263..504f3db 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; - atomic_t refcount; + struct kref refcount; struct rcu_head rcu; };