Xin LI fb1c6a1716 Do a dummy read to flush the interrupt ACK that we just performed,
ensuring that everything is really, truly consistent.

This fixes certain cases where one will see various:

mfi0: COMMAND 0xffffffXXXXXXXXXX TIMEOUT AFTER XX SECONDS

MFC after:	3 days
Submitted by:	scottl
Ok'ed by:	jhb
2011-11-09 21:53:49 +00:00
..
2011-10-13 20:06:19 +00:00