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authorJarek Poplawski <jarkao2@gmail.com>2008-11-25 13:56:06 -0800
committerDavid S. Miller <davem@davemloft.net>2008-11-25 13:56:06 -0800
commitf6486d40b33d1ac2c44c7c55db7edf022d9f4329 (patch)
treed3ad09264b9074cc70a3c7ec4229273f4779d8ed /net/sched
parent723b46108f8ee75b61ce703d0c9225e4f537bc46 (diff)
downloadlwn-f6486d40b33d1ac2c44c7c55db7edf022d9f4329.tar.gz
lwn-f6486d40b33d1ac2c44c7c55db7edf022d9f4329.zip
pkt_sched: sch_api: Remove qdisc_list_lock
After implementing qdisc->ops->peek() there is no more calling qdisc_tree_decrease_qlen() without rtnl_lock(), so qdisc_list_lock added by commit: f6e0b239a2657ea8cb67f0d83d0bfdbfd19a481b "pkt_sched: Fix qdisc list locking" can be removed. Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/sch_api.c25
1 files changed, 4 insertions, 21 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 1ef25e6ee1f9..3fcfd4ef11d1 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -204,28 +204,16 @@ struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
return NULL;
}
-/*
- * This lock is needed until some qdiscs stop calling qdisc_tree_decrease_qlen()
- * without rtnl_lock(); currently hfsc_dequeue(), netem_dequeue(), tbf_dequeue()
- */
-static DEFINE_SPINLOCK(qdisc_list_lock);
-
static void qdisc_list_add(struct Qdisc *q)
{
- if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
- spin_lock_bh(&qdisc_list_lock);
+ if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS))
list_add_tail(&q->list, &qdisc_root_sleeping(q)->list);
- spin_unlock_bh(&qdisc_list_lock);
- }
}
void qdisc_list_del(struct Qdisc *q)
{
- if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
- spin_lock_bh(&qdisc_list_lock);
+ if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS))
list_del(&q->list);
- spin_unlock_bh(&qdisc_list_lock);
- }
}
EXPORT_SYMBOL(qdisc_list_del);
@@ -234,22 +222,17 @@ struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
unsigned int i;
struct Qdisc *q;
- spin_lock_bh(&qdisc_list_lock);
-
for (i = 0; i < dev->num_tx_queues; i++) {
struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
struct Qdisc *txq_root = txq->qdisc_sleeping;
q = qdisc_match_from_root(txq_root, handle);
if (q)
- goto unlock;
+ goto out;
}
q = qdisc_match_from_root(dev->rx_queue.qdisc_sleeping, handle);
-
-unlock:
- spin_unlock_bh(&qdisc_list_lock);
-
+out:
return q;
}