The bug here is that:

	while (eng_busy & (!icq_empty) & dma_busy)

is never true because it's using bitwise instead of logical ANDs.  The
other bitwise AND conditions work as intended but I changed them as well
for consistency.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>