hpsa: fix 6-byte READ/WRITE with 0 length data xfer
hpsa: fix 6-byte READ/WRITE with 0 length data xfer

a 6-byte READ/WRITE CDB with a 0 block data transfer really
means a 256 block data transfer.  The RAID mapping code failed
to handle this case.  For 10/12/16 byte READ/WRITEs, 0 just means
no data should be transferred, and should not trigger BUG_ON.

Signed-off-by: Stephen M. Cameron <fcc9df7f1d62c98ed1e7091f4fa112f895d521f5@beardog.cce.hp.com>
Reported-by: Robert Elliott <fcf6aac10c16bf4310224494560ff8cb9772fa2e@hp.com>
Reviewed-by: Robert Elliott <fcf6aac10c16bf4310224494560ff8cb9772fa2e@hp.com>
Signed-off-by: Christoph Hellwig <923f7720577207a44b32e59bbfbea59d27f1ae8e@lst.de>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs