This patch fixes a regression introduced in v3.8-rc1 code where a
zero-length READ_CAPACITY_16 was no longer returning GOOD status, but
instead returning TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE to generate
a CHECK_CONDITION status.
This regression was introduced with the following commit:
commit de103c93af
Author: Christoph Hellwig <hch@lst.de>
Date: Tue Nov 6 12:24:09 2012 -0800
target: pass sense_reason as a return value
and this patch has been tested with the following zero-length CDB:
sg_raw /dev/sdd 9e 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SCSI Status: Good
Sense Information:
sense buffer empty
Also, convert sbc_emulate_readcapacity() to follow the same method
of handling transport_kmap_data_sg() return values, but we never
expect a zero-length request here.
Cc: Christoph Hellwig <hch@lst.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
8b4b0dcbf7