linux-kernel - [patch net-next V6 11/15] vlan: remove usage of dev->master in __vlan_find_dev

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Date:	Fri,  4 Jan 2013 09:48:59 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, edumazet@...gle.com, faisal.latif@...el.com,
	roland@...nel.org, sean.hefty@...el.com, hal.rosenstock@...il.com,
	fubar@...ibm.com, andy@...yhouse.net, divy@...lsio.com,
	jitendra.kalsaria@...gic.com, sony.chacko@...gic.com,
	linux-driver@...gic.com, kaber@...sh.net, ursula.braun@...ibm.com,
	blaschka@...ux.vnet.ibm.com, linux390@...ibm.com,
	shemminger@...tta.com, bhutchings@...arflare.com,
	therbert@...gle.com, xiyou.wangcong@...il.com, joe@...ches.com,
	gregory.v.rose@...el.com, john.r.fastabend@...el.com,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-s390@...r.kernel.org, bridge@...ts.linux-foundation.org,
	fbl@...hat.com
Subject: [patch net-next V6 11/15] vlan: remove usage of dev->master in __vlan_find_dev_deep()

Also, since all users call __vlan_find_dev_deep() with rcu_read_lock,
make no possibility to call this with rtnl mutex held only.

Signed-off-by: Jiri Pirko <jiri@...nulli.us>
---
 net/8021q/vlan_core.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index 65e06ab..380440b 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -60,21 +60,25 @@ bool vlan_do_receive(struct sk_buff **skbp)
 	return true;
 }
 
-/* Must be invoked with rcu_read_lock or with RTNL. */
-struct net_device *__vlan_find_dev_deep(struct net_device *real_dev,
+/* Must be invoked with rcu_read_lock. */
+struct net_device *__vlan_find_dev_deep(struct net_device *dev,
 					u16 vlan_id)
 {
-	struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info);
+	struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info);
 
 	if (vlan_info) {
 		return vlan_group_get_device(&vlan_info->grp, vlan_id);
 	} else {
 		/*
-		 * Bonding slaves do not have grp assigned to themselves.
-		 * Grp is assigned to bonding master instead.
+		 * Lower devices of master uppers (bonding, team) do not have
+		 * grp assigned to themselves. Grp is assigned to upper device
+		 * instead.
 		 */
-		if (netif_is_bond_slave(real_dev))
-			return __vlan_find_dev_deep(real_dev->master, vlan_id);
+		struct net_device *upper_dev;
+
+		upper_dev = netdev_master_upper_dev_get_rcu(dev);
+		if (upper_dev)
+			return __vlan_find_dev_deep(upper_dev, vlan_id);
 	}
 
 	return NULL;
-- 
1.8.0

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