[B.A.T.M.A.N.] [PATCH 5/8] batman-adv: Protect global TQ window with a spinlock

[Sven Eckelmann]

From: Linus Lüssing <linus.luess...@web.de>

Signed-off-by: Linus Lüssing <linus.luess...@web.de>
Signed-off-by: Marek Lindner <lindner_ma...@yahoo.de>
Signed-off-by: Sven Eckelmann <s...@narfation.org>
---
 net/batman-adv/originator.c |    1 +
 net/batman-adv/routing.c    |    4 ++++
 net/batman-adv/types.h      |    1 +
 3 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index b4cfe36..5b8fe32 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -102,6 +102,7 @@ struct neigh_node *create_neighbor(struct orig_node 
*orig_node,
 
        INIT_HLIST_NODE(&neigh_node->list);
        INIT_LIST_HEAD(&neigh_node->bonding_list);
+       spin_lock_init(&neigh_node->tq_lock);
 
        memcpy(neigh_node->addr, neigh, ETH_ALEN);
        neigh_node->orig_node = orig_neigh_node;
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index b7d43ca..f6c6422 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -415,10 +415,12 @@ static void update_orig(struct bat_priv *bat_priv,
                if (is_duplicate)
                        continue;
 
+               spin_lock_bh(&tmp_neigh_node->tq_lock);
                ring_buffer_set(tmp_neigh_node->tq_recv,
                                &tmp_neigh_node->tq_index, 0);
                tmp_neigh_node->tq_avg =
                        ring_buffer_avg(tmp_neigh_node->tq_recv);
+               spin_unlock_bh(&tmp_neigh_node->tq_lock);
        }
 
        if (!neigh_node) {
@@ -443,10 +445,12 @@ static void update_orig(struct bat_priv *bat_priv,
        orig_node->flags = batman_packet->flags;
        neigh_node->last_valid = jiffies;
 
+       spin_lock_bh(&neigh_node->tq_lock);
        ring_buffer_set(neigh_node->tq_recv,
                        &neigh_node->tq_index,
                        batman_packet->tq);
        neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
+       spin_unlock_bh(&neigh_node->tq_lock);
 
        if (!is_duplicate) {
                orig_node->last_ttl = batman_packet->ttl;
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 1854cbb..091476d 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -125,6 +125,7 @@ struct neigh_node {
        struct rcu_head rcu;
        struct orig_node *orig_node;
        struct hard_iface *if_incoming;
+       spinlock_t tq_lock;     /* protects: tq_recv, tq_index */
 };
 
 
-- 
1.7.4.4