xen-netback: fix race condition on XenBus disconnect
In some cases during XenBus disconnect event handling and subsequent queue resource release there may be some TX handlers active on other processors. Use RCU in order to synchronize with them. Signed-off-by: NIgor Druzhinin <igor.druzhinin@citrix.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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