AsiaBSDCon DEVSUMMIT patch

Greetings,

We've been talking about the situation with suspend/resume in the
tree. Here's a quick hack to allow one to suspend/resume an
individual device. This may or may not work too well, but it is
offered up for testing and criticism.

http://people.freebsd.org/~imp/devctl.diff

devctl -s ath 0 suspend ath0
devctl -r ath 0 resume ath0

Warner


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