Revert previous patch with subject "change mdelay to msleep and remove
from ISR path".  This patch seems to have caused bigger problems than
it solved, and it didn't solve much of a problem to begin with...

Discussion about backing-out this patch can be found here:

	http://marc.theaimsgroup.com/?l=linux-netdev&m=114321570402396&w=2

The git commit associated w/ the original patch is:

	6ba98d31

Signed-off-by: John W. Linville <linville@tuxdriver.com
Signed-off-by: Jeff Garzik <jeff@garzik.org>