'aggr_list.lock' can safely be used in place of another explicit spinlock when access to 'aggr_list' has to be guarded.

This avoids to take 2 locks, knowing that the 2nd one is always successful.

Now that the 'aggr_list.lock' is handled explicitly, the lock-free __sbk_something() variants should be used when dealing with 'aggr_list'.

Signed-off-by: Christophe JAILLET christophe.jaillet@wanadoo.fr --- Compile tested only. --- net/batman-adv/bat_v.c | 1 - net/batman-adv/bat_v_ogm.c | 30 +++++++++++++++--------------- net/batman-adv/types.h | 3 --- 3 files changed, 15 insertions(+), 19 deletions(-)

diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c index 64054edc2e3c..4ff6cf1ecae7 100644 --- a/net/batman-adv/bat_v.c +++ b/net/batman-adv/bat_v.c @@ -1085,7 +1085,6 @@ void batadv_v_hardif_init(struct batadv_hard_iface *hard_iface)

hard_iface->bat_v.aggr_len = 0; skb_queue_head_init(&hard_iface->bat_v.aggr_list); - spin_lock_init(&hard_iface->bat_v.aggr_list_lock); INIT_DELAYED_WORK(&hard_iface->bat_v.aggr_wq, batadv_v_ogm_aggr_work); } diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c index b841c83d9c3b..c9a00100f199 100644 --- a/net/batman-adv/bat_v_ogm.c +++ b/net/batman-adv/bat_v_ogm.c @@ -151,7 +151,7 @@ static unsigned int batadv_v_ogm_len(struct sk_buff *skb) * @skb: the OGM to check * @hard_iface: the interface to use to send the OGM * - * Caller needs to hold the hard_iface->bat_v.aggr_list_lock. + * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. * * Return: True, if the given OGMv2 packet still fits, false otherwise. */ @@ -162,7 +162,7 @@ static bool batadv_v_ogm_queue_left(struct sk_buff *skb, BATADV_MAX_AGGREGATION_BYTES); unsigned int ogm_len = batadv_v_ogm_len(skb);

- lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock); + lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock);

return hard_iface->bat_v.aggr_len + ogm_len <= max; } @@ -173,13 +173,13 @@ static bool batadv_v_ogm_queue_left(struct sk_buff *skb, * * Empties the OGMv2 aggregation queue and frees all the skbs it contained. * - * Caller needs to hold the hard_iface->bat_v.aggr_list_lock. + * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. */ static void batadv_v_ogm_aggr_list_free(struct batadv_hard_iface *hard_iface) { - lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock); + lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock);

- skb_queue_purge(&hard_iface->bat_v.aggr_list); + __skb_queue_purge(&hard_iface->bat_v.aggr_list); hard_iface->bat_v.aggr_len = 0; }

@@ -192,7 +192,7 @@ static void batadv_v_ogm_aggr_list_free(struct batadv_hard_iface *hard_iface) * * The aggregation queue is empty after this call. * - * Caller needs to hold the hard_iface->bat_v.aggr_list_lock. + * Caller needs to hold the hard_iface->bat_v.aggr_list.lock. */ static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface) { @@ -201,7 +201,7 @@ static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface) unsigned int ogm_len; struct sk_buff *skb;

- lockdep_assert_held(&hard_iface->bat_v.aggr_list_lock); + lockdep_assert_held(&hard_iface->bat_v.aggr_list.lock);

if (!aggr_len) return; @@ -215,7 +215,7 @@ static void batadv_v_ogm_aggr_send(struct batadv_hard_iface *hard_iface) skb_reserve(skb_aggr, ETH_HLEN + NET_IP_ALIGN); skb_reset_network_header(skb_aggr);

- while ((skb = skb_dequeue(&hard_iface->bat_v.aggr_list))) { + while ((skb = __skb_dequeue(&hard_iface->bat_v.aggr_list))) { hard_iface->bat_v.aggr_len -= batadv_v_ogm_len(skb);

ogm_len = batadv_v_ogm_len(skb); @@ -242,13 +242,13 @@ static void batadv_v_ogm_queue_on_if(struct sk_buff *skb, return; }

- spin_lock_bh(&hard_iface->bat_v.aggr_list_lock); + spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); if (!batadv_v_ogm_queue_left(skb, hard_iface)) batadv_v_ogm_aggr_send(hard_iface);

hard_iface->bat_v.aggr_len += batadv_v_ogm_len(skb); - skb_queue_tail(&hard_iface->bat_v.aggr_list, skb); - spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock); + __skb_queue_tail(&hard_iface->bat_v.aggr_list, skb); + spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); }

/** @@ -373,9 +373,9 @@ void batadv_v_ogm_aggr_work(struct work_struct *work) batv = container_of(work, struct batadv_hard_iface_bat_v, aggr_wq.work); hard_iface = container_of(batv, struct batadv_hard_iface, bat_v);

- spin_lock_bh(&hard_iface->bat_v.aggr_list_lock); + spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); batadv_v_ogm_aggr_send(hard_iface); - spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock); + spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock);

batadv_v_ogm_start_queue_timer(hard_iface); } @@ -406,9 +406,9 @@ void batadv_v_ogm_iface_disable(struct batadv_hard_iface *hard_iface) { cancel_delayed_work_sync(&hard_iface->bat_v.aggr_wq);

- spin_lock_bh(&hard_iface->bat_v.aggr_list_lock); + spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); batadv_v_ogm_aggr_list_free(hard_iface); - spin_unlock_bh(&hard_iface->bat_v.aggr_list_lock); + spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); }

/** diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index be7c02aa91e2..75a72d6676ec 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -126,9 +126,6 @@ struct batadv_hard_iface_bat_v { /** @aggr_len: size of the OGM aggregate (excluding ethernet header) */ unsigned int aggr_len;

- /** @aggr_list_lock: protects aggr_list */ - spinlock_t aggr_list_lock; - /** * @throughput_override: throughput override to disable link * auto-detection