Robert Watson 638ccea02a Allocate one of the spare ifnet integer fields to hold if_drv_flags,
which in the future will hold IFF_OACTIVE and IFF_RUNNING, and have
its access synchronized by the device driver rather than the
protocol stack.  This will avoid potential races in the management
of flags in if_flags.

Discussed with:	various (scottl, jhb, ...)
MFC after:	1 week
2005-07-21 22:01:06 +00:00
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