Kip Macy a76e397b3b - Close a race during which the open flag could be cleared but the tun_softc would still be referenced
by adding a separate TUN_CLOSED flag that is set after tunclose is done referencing it.

- drop the tun_mtx after the flag check to avoid holding it across if_detach which can recurse in to
  if_tun.c
2008-12-25 02:14:25 +00:00
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