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authorDavid S. Miller <davem@davemloft.net>2008-07-16 12:42:40 +0400
committerDavid S. Miller <davem@davemloft.net>2008-07-18 06:21:19 +0400
commit7698b4fcabcd790efc4f226bada1e7b5870653af (patch)
tree031ce7a911fc5bff995421a5615d9ab25416a479 /include/net/sch_generic.h
parente2627c8c2241bce45e368e150654d076b58a4595 (diff)
downloadlinux-7698b4fcabcd790efc4f226bada1e7b5870653af.tar.xz
pkt_sched: Add and use qdisc_root() and qdisc_root_lock().
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>
Diffstat (limited to 'include/net/sch_generic.h')
-rw-r--r--include/net/sch_generic.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index bc2a09da21b1..92417825d387 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -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;