linux-kernel - [PATCH net-next v2 07/10] batman-adv: use __dev_get_by_index instead of dev_get_by

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Message-ID: <1389752625-23189-8-git-send-email-ying.xue@windriver.com>
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

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