Resending patch 3/3 only.

These changes allow driver close routine to be called during module unload,
to clean-up buffers and other software resources, flush queues etc. Also,
hardware is reset to pristine state.
Signed-off-by: NDhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: NMilan Bag <mbag@netxen.com>
Signed-off-by: NWen Xiong <wenxiong@us.ibm.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>