John Baldwin 25f9805707 Don't wakeup the fdc worker thread once a second when idle.
The fdc worker thread was using a one second timeout while waiting for
a new bio to arrive or for the device to detach.  However, the driver
already does a wakeup when queueing a new bio or asking the thread to
detach, so the timeout only served to waste CPU time waking up the
thread once a second just so it could go right back to sleep.  Use an
infinite timeout instead.

Discussed with:	phk
Sponsored by:	Netflix
2016-04-05 00:08:42 +00:00
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