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net: qdisc: use rcu prefix and silence sparse warnings

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Add __rcu notation to qdisc handling by doing this we can make
smatch output more legible. And anyways some of the cases should
be using rcu_dereference() see qdisc_all_tx_empty(),
qdisc_tx_chainging(), and so on.

Also *wake_queue() API is commonly called from driver timer routines
without rcu lock or rtnl lock. So I added rcu_read_lock() blocks
around netif_wake_subqueue and netif_tx_wake_queue.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend 2014-09-12 20:04:52 -07:00 • committed by David S. Miller
parent d1015645dd
commit 46e5da40ae
6 changed files with 82 additions and 42 deletions
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4
net/sched/sch_generic.c
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@ -783,7 +783,7 @@ static void dev_deactivate_queue(struct net_device *dev,
struct Qdisc *qdisc_default = _qdisc_default;
struct Qdisc *qdisc;
qdisc = dev_queue->qdisc;
qdisc = rtnl_dereference(dev_queue->qdisc);
if (qdisc) {
spin_lock_bh(qdisc_lock(qdisc));
@ -876,7 +876,7 @@ static void dev_init_scheduler_queue(struct net_device *dev,
{
struct Qdisc *qdisc = _qdisc;
dev_queue->qdisc = qdisc;
rcu_assign_pointer(dev_queue->qdisc, qdisc);
dev_queue->qdisc_sleeping = qdisc;
}