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pkt_sched: No longer destroy qdiscs from RCU. 

We can now kill them synchronously with all of the
previous dev_deactivate() cures.

This makes netdev destruction and shutdown saner as
the qdiscs hold references to the device.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-08-17 22:31:26 -07:00
parent 3a76e3716b
commit 1e0d5a5747
2 changed files with 9 additions and 19 deletions
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1
include/net/sch_generic.h
View File

@ -61,7 +61,6 @@ struct Qdisc
struct gnet_stats_basic bstats;
struct gnet_stats_queue qstats;
struct gnet_stats_rate_est rate_est;
struct rcu_head q_rcu;
int (*reshape_fail)(struct sk_buff *skb,
struct Qdisc *q);

27
net/sched/sch_generic.c
View File

@ -518,14 +518,19 @@ void qdisc_reset(struct Qdisc *qdisc)
}
EXPORT_SYMBOL(qdisc_reset);
/* this is the rcu callback function to clean up a qdisc when there
* are no further references to it */
/* Under qdisc_lock(qdisc) and BH! */
static void __qdisc_destroy(struct rcu_head *head)
void qdisc_destroy(struct Qdisc *qdisc)
{
struct Qdisc *qdisc = container_of(head, struct Qdisc, q_rcu);
const struct Qdisc_ops *ops = qdisc->ops;
if (qdisc->flags & TCQ_F_BUILTIN ||
!atomic_dec_and_test(&qdisc->refcnt))
return;
if (qdisc->parent)
list_del(&qdisc->list);
#ifdef CONFIG_NET_SCHED
qdisc_put_stab(qdisc->stab);
#endif
@ -542,20 +547,6 @@ static void __qdisc_destroy(struct rcu_head *head)
kfree((char *) qdisc - qdisc->padded);
}
/* Under qdisc_lock(qdisc) and BH! */
void qdisc_destroy(struct Qdisc *qdisc)
{
if (qdisc->flags & TCQ_F_BUILTIN ||
!atomic_dec_and_test(&qdisc->refcnt))
return;
if (qdisc->parent)
list_del(&qdisc->list);
call_rcu(&qdisc->q_rcu, __qdisc_destroy);
}
EXPORT_SYMBOL(qdisc_destroy);
static bool dev_all_qdisc_sleeping_noop(struct net_device *dev)