From patchwork Wed Feb 10 15:57:10 2016
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
X-Patchwork-Submitter: Antonio Quartulli
X-Patchwork-Id: 5060
Return-Path:
Received-SPF: Permerror (SPF Permanent Error: Two or more type TXT spf
records found.) identity=mailfrom; client-ip=5.148.176.60;
helo=s2.neomailbox.net;
envelope-from=a@unstable.cc; receiver=b.a.t.m.a.n@lists.open-mesh.org
Authentication-Results: open-mesh.org; dmarc=none header.from=unstable.cc
Received: from s2.neomailbox.net (s2.neomailbox.net [5.148.176.60])
by open-mesh.org (Postfix) with ESMTPS id DF46C81CF7
for ;
Wed, 10 Feb 2016 17:00:05 +0100 (CET)
From: Antonio Quartulli
To: davem@davemloft.net
Date: Wed, 10 Feb 2016 23:57:10 +0800
Message-Id: <1455119847-5862-5-git-send-email-a@unstable.cc>
In-Reply-To: <1455119847-5862-1-git-send-email-a@unstable.cc>
References: <1455119847-5862-1-git-send-email-a@unstable.cc>
Cc: netdev@vger.kernel.org, b.a.t.m.a.n@lists.open-mesh.org,
Antonio Quartulli ,
Marek Lindner
Subject: [B.A.T.M.A.N.] [PATCH 04/21] batman-adv: Convert
batadv_hardif_neigh_node to kref
X-BeenThere: b.a.t.m.a.n@lists.open-mesh.org
X-Mailman-Version: 2.1.18
Precedence: list
List-Id: The list for a Better Approach To Mobile Ad-hoc Networking
List-Unsubscribe: ,
List-Archive:
List-Post:
List-Help:
List-Subscribe: ,
X-List-Received-Date: Wed, 10 Feb 2016 16:00:11 -0000
From: Sven Eckelmann
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
Signed-off-by: Marek Lindner
Signed-off-by: Antonio Quartulli
---
net/batman-adv/originator.c | 20 ++++++++++++--------
net/batman-adv/types.h | 3 ++-
2 files changed, 14 insertions(+), 9 deletions(-)
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index d4a30db0158a..7710595ffc42 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -23,6 +23,7 @@
#include
#include
#include
+#include
#include
#include
#include
@@ -196,11 +197,15 @@ void batadv_neigh_ifinfo_free_ref(struct batadv_neigh_ifinfo *neigh_ifinfo)
/**
* batadv_hardif_neigh_release - release hardif neigh node from lists and
* queue for free after rcu grace period
- * @hardif_neigh: hardif neigh neighbor to free
+ * @ref: kref pointer of the neigh_node
*/
-static void
-batadv_hardif_neigh_release(struct batadv_hardif_neigh_node *hardif_neigh)
+static void batadv_hardif_neigh_release(struct kref *ref)
{
+ struct batadv_hardif_neigh_node *hardif_neigh;
+
+ hardif_neigh = container_of(ref, struct batadv_hardif_neigh_node,
+ refcount);
+
spin_lock_bh(&hardif_neigh->if_incoming->neigh_list_lock);
hlist_del_init_rcu(&hardif_neigh->list);
spin_unlock_bh(&hardif_neigh->if_incoming->neigh_list_lock);
@@ -216,8 +221,7 @@ batadv_hardif_neigh_release(struct batadv_hardif_neigh_node *hardif_neigh)
*/
void batadv_hardif_neigh_free_ref(struct batadv_hardif_neigh_node *hardif_neigh)
{
- if (atomic_dec_and_test(&hardif_neigh->refcount))
- batadv_hardif_neigh_release(hardif_neigh);
+ kref_put(&hardif_neigh->refcount, batadv_hardif_neigh_release);
}
/**
@@ -529,7 +533,7 @@ batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface,
hardif_neigh->if_incoming = hard_iface;
hardif_neigh->last_seen = jiffies;
- atomic_set(&hardif_neigh->refcount, 1);
+ kref_init(&hardif_neigh->refcount);
if (bat_priv->bat_algo_ops->bat_hardif_neigh_init)
bat_priv->bat_algo_ops->bat_hardif_neigh_init(hardif_neigh);
@@ -584,7 +588,7 @@ batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface,
if (!batadv_compare_eth(tmp_hardif_neigh->addr, neigh_addr))
continue;
- if (!atomic_inc_not_zero(&tmp_hardif_neigh->refcount))
+ if (!kref_get_unless_zero(&tmp_hardif_neigh->refcount))
continue;
hardif_neigh = tmp_hardif_neigh;
@@ -648,7 +652,7 @@ batadv_neigh_node_new(struct batadv_orig_node *orig_node,
spin_unlock_bh(&orig_node->neigh_list_lock);
/* increment unique neighbor refcount */
- atomic_inc(&hardif_neigh->refcount);
+ kref_get(&hardif_neigh->refcount);
batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv,
"Creating new neighbor %pM for orig_node %pM on interface %s\n",
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 8974bc0dc15c..ace7900347d4 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -25,6 +25,7 @@
#include
#include
#include
+#include
#include
#include /* for linux/wait.h */
#include
@@ -359,7 +360,7 @@ struct batadv_hardif_neigh_node {
u8 addr[ETH_ALEN];
struct batadv_hard_iface *if_incoming;
unsigned long last_seen;
- atomic_t refcount;
+ struct kref refcount;
struct rcu_head rcu;
};