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target: Fix zero-length READ_CAPACITY_16 regression

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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>
This commit is contained in:
Nicholas Bellinger 2013-01-29 14:18:00 -08:00
parent cab9609b44
commit 8b4b0dcbf7
1 changed files with 8 additions and 10 deletions
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18
drivers/target/target_core_sbc.c
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@ -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;