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authordingtianhong <dingtianhong@huawei.com>2013-12-13 10:19:55 +0800
committerDavid S. Miller <davem@davemloft.net>2013-12-14 01:58:02 -0500
commite001bfad913bf119fb67c1e8dd2d4ec1f5d392fa (patch)
treefe08e42121a1b5e9bf173af18c04e78c884cc5bf /net/core/dev.c
parent2e52f4fe3655c7a2311070c6713f7feabc75486c (diff)
downloadlinux-linaro-stable-e001bfad913bf119fb67c1e8dd2d4ec1f5d392fa.tar.gz
bonding: create bond_first_slave_rcu()
The bond_first_slave_rcu() will be used to instead of bond_first_slave() in rcu_read_lock(). According to the Jay Vosburgh's suggestion, the struct netdev_adjacent should hide from users who wanted to use it directly. so I package a new function to get the first slave of the bond. Suggested-by: Nikolay Aleksandrov <nikolay@redhat.com> Suggested-by: Jay Vosburgh <fubar@us.ibm.com> Suggested-by: Veaceslav Falico <vfalico@redhat.com> Signed-off-by: Ding Tianhong <dingtianhong@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
-rw-r--r--net/core/dev.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index c95d664b2b42..9d4369ece679 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4544,6 +4544,27 @@ void *netdev_lower_get_next_private_rcu(struct net_device *dev,
EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);
/**
+ * netdev_lower_get_first_private_rcu - Get the first ->private from the
+ * lower neighbour list, RCU
+ * variant
+ * @dev: device
+ *
+ * Gets the first netdev_adjacent->private from the dev's lower neighbour
+ * list. The caller must hold RCU read lock.
+ */
+void *netdev_lower_get_first_private_rcu(struct net_device *dev)
+{
+ struct netdev_adjacent *lower;
+
+ lower = list_first_or_null_rcu(&dev->adj_list.lower,
+ struct netdev_adjacent, list);
+ if (lower)
+ return lower->private;
+ return NULL;
+}
+EXPORT_SYMBOL(netdev_lower_get_first_private_rcu);
+
+/**
* netdev_master_upper_dev_get_rcu - Get master upper device
* @dev: device
*