target: Fix zero-length READ_CAPACITY_16 regression

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 de103c93aff0bed0ae984274e5dc8b95899badab
  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>

1 files changed, 8 insertions, 10 deletions

diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index 26a6d183ccb1..a664c664a31a 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -58,11 +58,10 @@ sbc_emulate_readcapacity(struct se_cmd *cmd)
         buf[7] = dev->dev_attrib.block_size & 0xff;
 
         rbuf = transport_kmap_data_sg(cmd);
-        if (!rbuf)
-                return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
-
-        memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
-        transport_kunmap_data_sg(cmd);
+        if (rbuf) {
+                memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
+                transport_kunmap_data_sg(cmd);
+        }
 
         target_complete_cmd(cmd, GOOD);
         return 0;
@@ -97,11 +96,10 @@ sbc_emulate_readcapacity_16(struct se_cmd *cmd)
                 buf[14] = 0x80;
 
         rbuf = transport_kmap_data_sg(cmd);
-        if (!rbuf)
-                return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
-
-        memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
-        transport_kunmap_data_sg(cmd);
+        if (rbuf) {
+                memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
+                transport_kunmap_data_sg(cmd);
+        }
 
         target_complete_cmd(cmd, GOOD);
         return 0;