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authorSven Eckelmann <sven@narfation.org>2016-01-16 10:29:55 +0100
committerAntonio Quartulli <a@unstable.cc>2016-02-10 23:24:05 +0800
commit161a3be9324eaed3ecd1879c994d58b16bbf4732 (patch)
tree91dd9a0065e5d4c3c291c8dc49da0d168c6c0dd1 /net
parent7a659d5694b9b580615f0a813b1e6675f26c629e (diff)
downloadop-kernel-dev-161a3be9324eaed3ecd1879c994d58b16bbf4732.zip
op-kernel-dev-161a3be9324eaed3ecd1879c994d58b16bbf4732.tar.gz
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> Signed-off-by: Antonio Quartulli <a@unstable.cc>
Diffstat (limited to 'net')
-rw-r--r--net/batman-adv/originator.c26
-rw-r--r--net/batman-adv/types.h2
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;
};
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