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net: use rcu for network scheduler API 

Use RCU to walk list of network devices in qdisc dump.
This could be optimized for large number of devices.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2009-11-10 07:54:49 +00:00 committed by David S. Miller
parent 9e067597ee
commit f1e9016da6
1 changed files with 4 additions and 3 deletions
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7
net/sched/sch_api.c
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@ -1279,9 +1279,10 @@ static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
s_idx = cb->args[0];
s_q_idx = q_idx = cb->args[1];
read_lock(&dev_base_lock);
rcu_read_lock();
idx = 0;
for_each_netdev(&init_net, dev) {
for_each_netdev_rcu(&init_net, dev) {
struct netdev_queue *dev_queue;
if (idx < s_idx)
@ -1302,7 +1303,7 @@ cont:
}
done:
read_unlock(&dev_base_lock);
rcu_read_unlock();
cb->args[0] = idx;
cb->args[1] = q_idx;