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-rw-r--r--net/sched/sch_generic.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index c84b65920d1..b1721d71c27 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -815,9 +815,17 @@ static bool some_qdisc_is_busy(struct net_device *dev)
return false;
}
+/**
+ * dev_deactivate_many - deactivate transmissions on several devices
+ * @head: list of devices to deactivate
+ *
+ * This function returns only when all outstanding transmissions
+ * have completed, unless all devices are in dismantle phase.
+ */
void dev_deactivate_many(struct list_head *head)
{
struct net_device *dev;
+ bool sync_needed = false;
list_for_each_entry(dev, head, unreg_list) {
netdev_for_each_tx_queue(dev, dev_deactivate_queue,
@@ -827,10 +835,15 @@ void dev_deactivate_many(struct list_head *head)
&noop_qdisc);
dev_watchdog_down(dev);
+ sync_needed |= !dev->dismantle;
}
- /* Wait for outstanding qdisc-less dev_queue_xmit calls. */
- synchronize_rcu();
+ /* Wait for outstanding qdisc-less dev_queue_xmit calls.
+ * This is avoided if all devices are in dismantle phase :
+ * Caller will call synchronize_net() for us
+ */
+ if (sync_needed)
+ synchronize_net();
/* Wait for outstanding qdisc_run calls. */
list_for_each_entry(dev, head, unreg_list)