Ian Dowse f5f1525321 Add IFF_NEEDSGIANT to IFF_CANTCHANGE, to prevent user-level code
from clearing the IFF_NEEDSGIANT flag on Giant-locked interfaces.
In particular, wpa_supplicant was doing this on USB interfaces,
causing panics when Giant-locked code was then called without Giant.

Submitted by:	Alexey Popov
Reviewed by:	rwatson
MFC after:	3 days
2008-03-27 18:02:30 +00:00
..
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