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net: Change handling of the __QDISC_STATE_SCHED flag in net_tx_action(). 

Change handling of the __QDISC_STATE_SCHED flag in net_tx_action() to
enable proper control in dev_deactivate(). Now, if this flag is seen
as unset under root_lock means a qdisc can't be netif_scheduled.

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jarek Poplawski 2008-08-17 21:54:43 -07:00 committed by David S. Miller
parent a9312ae893
commit def82a1db1
1 changed files with 19 additions and 15 deletions
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34
net/core/dev.c
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@ -1339,19 +1339,23 @@ static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
}
static inline void __netif_reschedule(struct Qdisc *q)
{
struct softnet_data *sd;
unsigned long flags;
local_irq_save(flags);
sd = &__get_cpu_var(softnet_data);
q->next_sched = sd->output_queue;
sd->output_queue = q;
raise_softirq_irqoff(NET_TX_SOFTIRQ);
local_irq_restore(flags);
}
void __netif_schedule(struct Qdisc *q)
{
if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) {
struct softnet_data *sd;
unsigned long flags;
local_irq_save(flags);
sd = &__get_cpu_var(softnet_data);
q->next_sched = sd->output_queue;
sd->output_queue = q;
raise_softirq_irqoff(NET_TX_SOFTIRQ);
local_irq_restore(flags);
}
if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
__netif_reschedule(q);
}
EXPORT_SYMBOL(__netif_schedule);
@ -1980,15 +1984,15 @@ static void net_tx_action(struct softirq_action *h)
head = head->next_sched;
smp_mb__before_clear_bit();
clear_bit(__QDISC_STATE_SCHED, &q->state);
root_lock = qdisc_lock(q);
if (spin_trylock(root_lock)) {
smp_mb__before_clear_bit();
clear_bit(__QDISC_STATE_SCHED,
&q->state);
qdisc_run(q);
spin_unlock(root_lock);
} else {
__netif_schedule(q);
__netif_reschedule(q);
}
}
}