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; };