249f4297db
Previously, another thread could get a pointer to the interface by scanning the system-wide list and sleep on the global vlan mutex held by vlan_unconfig(). The interface was gone by the time the other thread woke up. In order to be able to call vlan_unconfig() on a detached interface, remove the purely cosmetic bzero'ing of IF_LLADDR from the function because a detached interface has no addresses. Noticed by: a stress-testing script by maxim Reviewed by: glebius
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