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batman-adv: Place kref_get for hard_iface near use

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It is hard to understand why the refcnt is increased when it isn't done
near the actual place the new reference is used. So using kref_get right
before the place which requires the reference and in the same function
helps to avoid accidental problems caused by incorrect reference counting.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Sven Eckelmann 2016-07-15 17:39:28 +02:00 committed by Simon Wunderlich
parent f665fa7e85
commit b2367e46fa
1 changed files with 2 additions and 4 deletions
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6
net/batman-adv/hard-interface.c
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@ -694,6 +694,7 @@ batadv_hardif_add_interface(struct net_device *net_dev)
INIT_HLIST_HEAD(&hard_iface->neigh_list);
spin_lock_init(&hard_iface->neigh_list_lock);
kref_init(&hard_iface->refcount);
hard_iface->num_bcasts = BATADV_NUM_BCASTS_DEFAULT;
if (batadv_is_wifi_netdev(net_dev))
@ -701,11 +702,8 @@ batadv_hardif_add_interface(struct net_device *net_dev)
batadv_v_hardif_init(hard_iface);
/* extra reference for return */
kref_init(&hard_iface->refcount);
kref_get(&hard_iface->refcount);
batadv_check_known_mac_addr(hard_iface->net_dev);
kref_get(&hard_iface->refcount);
list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
return hard_iface;