Patch to fix locking nits in hme

[John Baldwin]

I have a patch to fix several nits in the hme(4) driver's locking including:

- Using the driver lock instead of Giant in a busdma callback.
- Using callout_drain() in detach.
- Locking access to the mii registers with the driver lock.
- Clearing the RUNNING and OACTIVE flags in stop.
- Re-enabling updating the media from hme_init_locked().
- Making the mutex non-recursive.
- Fixing locking in ioctl.

Patch is at http://www.freebsd.org/~jhb/patches/hme_locking.patch

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
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