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authorVeaceslav Falico <vfalico@redhat.com>2013-08-28 23:25:07 +0200
committerDavid S. Miller <davem@davemloft.net>2013-08-29 16:19:42 -0400
commit48311f46853c0361f9fba7e0e6bb1652d633c049 (patch)
tree75d08bc2b59876668f50a293eae746755b2cc075 /net/core/dev.c
parent620f3186caa8124e0efaf329751cf51c5d55c731 (diff)
downloadlinux-linaro-stable-48311f46853c0361f9fba7e0e6bb1652d633c049.tar.gz
net: add netdev_upper_get_next_dev_rcu(dev, iter)
This function returns the next dev in the dev->upper_dev_list after the struct list_head **iter position, and updates *iter accordingly. Returns NULL if there are no devices left. Caller must hold RCU read lock. CC: "David S. Miller" <davem@davemloft.net> CC: Eric Dumazet <edumazet@google.com> CC: Jiri Pirko <jiri@resnulli.us> CC: Alexander Duyck <alexander.h.duyck@intel.com> CC: Cong Wang <amwang@redhat.com> Signed-off-by: Veaceslav Falico <vfalico@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
-rw-r--r--net/core/dev.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 749925a040a4..6fbb0c90849b 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4468,6 +4468,31 @@ struct net_device *netdev_master_upper_dev_get(struct net_device *dev)
}
EXPORT_SYMBOL(netdev_master_upper_dev_get);
+/* netdev_upper_get_next_dev_rcu - Get the next dev from upper list
+ * @dev: device
+ * @iter: list_head ** of the current position
+ *
+ * Gets the next device from the dev's upper list, starting from iter
+ * position. The caller must hold RCU read lock.
+ */
+struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
+ struct list_head **iter)
+{
+ struct netdev_adjacent *upper;
+
+ WARN_ON_ONCE(!rcu_read_lock_held());
+
+ upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
+
+ if (&upper->list == &dev->upper_dev_list)
+ return NULL;
+
+ *iter = &upper->list;
+
+ return upper->dev;
+}
+EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu);
+
/**
* netdev_master_upper_dev_get_rcu - Get master upper device
* @dev: device