The AMSO driver was not thread-safe in the post WR code and had
code that would sleep if the WR post FIFO was full. Since these
functions can be called on interrupt level I changed the sleep to a
udelay.
Signed-off-by: NTom Tucker <tom@opengridcomputing.com>
Signed-off-by: NRoland Dreier <rolandd@cisco.com>