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Date: Wed, 15 Jan 2014 10:23:42 +0800 From: Ying Xue <ying.xue@...driver.com> To: <davem@...emloft.net> CC: <vfalico@...hat.com>, <john.r.fastabend@...el.com>, <stephen@...workplumber.org>, <antonio@...hcoding.com>, <dmitry.tarnyagin@...kless.no>, <socketcan@...tkopp.net>, <johannes@...solutions.net>, <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: [PATCH net-next v2 07/10] batman-adv: use __dev_get_by_index instead of dev_get_by_index to find interface 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@...hcoding.com> Signed-off-by: Ying Xue <ying.xue@...driver.com> Acked-by: Antonio Quartulli <antonio@...hcoding.com> --- net/batman-adv/hard-interface.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) 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; } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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