tree 0dde04e6dfad7cd76afbb31eff72a8f08a574a9c
parent 76ac21f5ef30e46397e405695eb1240ff0955209
author stephen hemminger <shemminger@vyatta.com> 1279824304 +0000
committer David S. Miller <davem@davemloft.net> 1280030660 -0700

net sched: fix race in mirred device removal

This fixes hang when target device of mirred packet classifier
action is removed.

If a mirror or redirection action is configured to cause packets
to go to another device, the classifier holds a ref count, but was assuming
the adminstrator cleaned up all redirections before removing. The fix
is to add a notifier and cleanup during unregister.

The new list is implicitly protected by RTNL mutex because
it is held during filter add/delete as well as notifier.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>