Robert Watson 31302ebf9d Define IFF_LOCKGIANT() and IFF_UNLOCKGIANT() macros, which conditionally
acquire Giant if the passed interface has IFF_NEEDSGIANT set on it.
Modify calls into (ifp)->if_ioctl() in if.c to use these macros in order
to ensure that Giant is held.

MFC after:	3 days
Bumped into by:	jmg
2004-10-19 18:11:55 +00:00
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