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pkt_sched: Add and use qdisc_root() and qdisc_root_lock().

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When code wants to lock the qdisc tree state, the logic
operation it's doing is locking the top-level qdisc that
sits of the root of the netdev_queue.

Add qdisc_root_lock() to represent this and convert the
easiest cases.

In order for this to work out in all cases, we have to
hook up the noop_qdisc to a dummy netdev_queue.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2008-07-17 19:21:19 -07:00
parent e2627c8c22
commit 7698b4fcab
7 changed files with 55 additions and 26 deletions
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include/net/sch_generic.h
+12
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@@ -161,6 +161,18 @@ struct tcf_proto
struct tcf_proto_ops *ops;
};
static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
{
return qdisc->dev_queue->qdisc;
}
static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
{
struct Qdisc *root = qdisc_root(qdisc);
return &root->dev_queue->lock;
}
static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
{
return qdisc->dev_queue->dev;