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net/dst: dst_dev_event() called after other notifiers 

Followup of commit ef885afbf8 (net: use rcu_barrier() in
rollback_registered_many)

dst_dev_event() scans a garbage dst list that might be feeded by various
network notifiers at device dismantle time.

Its important to call dst_dev_event() after other notifiers, or we might
enter the infamous msleep(250) in netdev_wait_allrefs(), and wait one
second before calling again call_netdevice_notifiers(NETDEV_UNREGISTER,
dev) to properly remove last device references.

Use priority -10 to let dst_dev_notifier be called after other network
notifiers (they have the default 0 priority)

Reported-by: Ben Greear <greearb@candelatech.com>
Reported-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Reported-by: Octavian Purdila <opurdila@ixiacom.com>
Reported-by: Benjamin LaHaise <bcrl@kvack.org>
Tested-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-11-09 11:46:33 -08:00 committed by David S. Miller
parent 88f8a5e3e7
commit 332dd96f7a
1 changed files with 1 additions and 0 deletions
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net/core/dst.c
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@ -370,6 +370,7 @@ static int dst_dev_event(struct notifier_block *this, unsigned long event,
static struct notifier_block dst_dev_notifier = {
.notifier_call = dst_dev_event,
.priority = -10, /* must be called after other network notifiers */
};
void __init dst_init(void)