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Subject[PATCH] [72/139] net/dst: dst_dev_event() called after other notifiers
2.6.35-longterm review patch.  If anyone has any objections, please let me know.


From: Eric Dumazet <>

[ Upstream commit 332dd96f7ac15e937088fe11f15cfe0210e8edd1 ]

Followup of commit ef885afbf8a37689 (net: use rcu_barrier() in

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 <>
Reported-by: Nicolas Dichtel <>
Reported-by: Octavian Purdila <>
Reported-by: Benjamin LaHaise <>
Tested-by: Ben Greear <>
Signed-off-by: Eric Dumazet <>
Signed-off-by: David S. Miller <>
Signed-off-by: Greg Kroah-Hartman <>
Signed-off-by: Andi Kleen <>

net/core/dst.c | 1 +
1 file changed, 1 insertion(+)

Index: linux-2.6.35.y/net/core/dst.c
--- linux-2.6.35.y.orig/net/core/dst.c
+++ linux-2.6.35.y/net/core/dst.c
@@ -343,6 +343,7 @@ static int dst_dev_event(struct notifier

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)

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