Looking for an interface and increasing its refcounter only to check if it really exists is not really useful and makes the code look more complex without a real gain.
Change batadv_mcast_has_bridge() accordingly and avoid to use the pointer to the interface outside of the rcu_read_lock/unlock context.
Introduced by e368857f66620b8483166e8e6556d9c87f9b3e71 ("batman-adv: Multicast Listener Announcements via Translation Table")
Cc: Linus Lüssing linus.luessing@web.de Signed-off-by: Antonio Quartulli antonio@meshcoding.com --- compat.h | 19 ++++--------------- multicast.c | 33 +++++++-------------------------- 2 files changed, 11 insertions(+), 41 deletions(-)
diff --git a/compat.h b/compat.h index e14c6bb..5eb5fe6 100644 --- a/compat.h +++ b/compat.h @@ -164,14 +164,8 @@ static inline int batadv_param_set_copystring(const char *val, #define NET_ADDR_RANDOM 0
#define netdev_master_upper_dev_get_rcu(dev) \ - upper; \ - if (dev->br_port ? 1 : 0) { \ - rcu_read_unlock(); \ - dev_hold(dev); \ - return dev; \ - } else {\ - dev = NULL; \ - } + (dev->br_port ? dev : NULL); \ + break;
#endif /* < KERNEL_VERSION(2, 6, 36) */
@@ -375,13 +369,8 @@ static int __batadv_interface_tx(struct sk_buff *skb, \
#ifndef netdev_master_upper_dev_get_rcu #define netdev_master_upper_dev_get_rcu(dev) \ - upper; \ - if (dev->priv_flags & IFF_BRIDGE_PORT) { \ - rcu_read_unlock(); \ - dev_hold(dev); \ - return dev; \ - } else \ - dev = NULL; + (dev->priv_flags & IFF_BRIDGE_PORT ? dev : NULL); \ + break;
#endif /* netdev_master_upper_dev_get_rcu */
diff --git a/multicast.c b/multicast.c index d92de1e..af3fe49 100644 --- a/multicast.c +++ b/multicast.c @@ -156,16 +156,16 @@ static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, }
/** - * batadv_mcast_get_bridge - get the bridge interface on our soft interface + * batadv_mcast_has_bridge - check whether the soft-iface is bridged * @bat_priv: the bat priv with all the soft interface information * - * Return the next bridge interface on top of our soft interface and increase - * its refcount. If no such bridge interface exists, then return NULL. + * Check whether there is a bridge on top of our soft interface. Return + * true if so, false otherwise. */ -static struct net_device * -batadv_mcast_get_bridge(struct batadv_priv *bat_priv) +static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) { struct net_device *upper = bat_priv->soft_iface; + bool has_bridge = false;
rcu_read_lock();
@@ -174,30 +174,11 @@ batadv_mcast_get_bridge(struct batadv_priv *bat_priv) } while (upper && !(upper->priv_flags & IFF_EBRIDGE));
if (upper) - dev_hold(upper); + has_bridge = true;
rcu_read_unlock();
- return upper; -} - -/** - * batadv_mcast_has_bridge - check whether the soft-iface is bridged - * @bat_priv: the bat priv with all the soft interface information - * - * Check whether there is a bridge on top of our soft interface. Return - * true if so, false otherwise. - */ -static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv) -{ - struct net_device *bridge; - - bridge = batadv_mcast_get_bridge(bat_priv); - if (!bridge) - return false; - - dev_put(bridge); - return true; + return has_bridge; }
/**