| Message ID | 1389752625-23189-8-git-send-email-ying.xue@windriver.com |
|---|---|
| State | Accepted, archived |
| Delegated to: | David Miller |
| Headers | show |
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c index 1b12573..3d417d3 100644 --- a/net/batman-adv/hard-interface.c +++ b/net/batman-adv/hard-interface.c @@ -87,15 +87,13 @@ static bool batadv_is_on_batman_iface(const struct net_device *net_dev) return false; /* recurse over the parent device */ - parent_dev = dev_get_by_index(&init_net, net_dev->iflink); + parent_dev = __dev_get_by_index(&init_net, net_dev->iflink); /* if we got a NULL parent_dev there is something broken.. */ if (WARN(!parent_dev, "Cannot find parent device")) return false; ret = batadv_is_on_batman_iface(parent_dev); - if (parent_dev) - dev_put(parent_dev); return ret; }
The following call chains indicate that batadv_is_on_batman_iface() is always under rtnl_lock protection as call_netdevice_notifier() is protected by rtnl_lock. So if __dev_get_by_index() rather than dev_get_by_index() is used to find interface handler in it, this would help us avoid to change interface reference counter. call_netdevice_notifier() batadv_hard_if_event() batadv_hardif_add_interface() batadv_is_valid_iface() batadv_is_on_batman_iface() Cc: Antonio Quartulli <antonio@meshcoding.com> Signed-off-by: Ying Xue <ying.xue@windriver.com> Acked-by: Antonio Quartulli <antonio@meshcoding.com> --- net/batman-adv/hard-interface.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)