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net: add RCU variant to search for netdev_adjacent link

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Currently we have only the RTNL flavour, however we can traverse it while
holding only RCU, so add the RCU search. Add an RCU variant that uses
list_head * as an argument, so that it can be universally used afterwards.

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>
This commit is contained in:
Veaceslav Falico 2013-09-25 09:20:08 +02:00 committed by David S. Miller
parent 2f268f129c
commit 5249dec738
1 changed files with 13 additions and 0 deletions
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13
net/core/dev.c
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@ -4380,6 +4380,19 @@ struct netdev_adjacent {
struct rcu_head rcu;
};
static struct netdev_adjacent *__netdev_find_adj_rcu(struct net_device *dev,
struct net_device *adj_dev,
struct list_head *adj_list)
{
struct netdev_adjacent *adj;
list_for_each_entry_rcu(adj, adj_list, list) {
if (adj->dev == adj_dev)
return adj;
}
return NULL;
}
static struct netdev_adjacent *__netdev_find_adj(struct net_device *dev,
struct net_device *adj_dev,
struct list_head *adj_list)