For bidirectional commands we need to be able to distinguish between the
in and out scsi_data_buffers when calculating the wire transfer length.
Make scsi_transfer_length() take a scsi_data_buffer argument so the
caller can choose which I/O direction the calculation should apply to.
Signed-off-by: Martin K. Petersen <martin.peter...@oracle.com>
Cc: Sagi Grimberg <sa...@mellanox.com>
Cc: Christoph Hellwig <h...@infradead.org>
---
drivers/scsi/libiscsi.c | 2 +-
drivers/target/loopback/tcm_loop.c | 2 +-
include/scsi/scsi_cmnd.h | 5 +++--
3 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index f2db82beb646..fdea8c1527d4 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -391,7 +391,7 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
task->protected = true;
- transfer_length = scsi_transfer_length(sc);
+ transfer_length = scsi_transfer_length(sc, scsi_out(sc));
hdr->data_length = cpu_to_be32(transfer_length);
if (sc->sc_data_direction == DMA_TO_DEVICE) {
struct iscsi_r2t_info *r2t = &task->unsol_r2t;
diff --git a/drivers/target/loopback/tcm_loop.c
b/drivers/target/loopback/tcm_loop.c
index 340de9d92b15..c50453df555a 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -213,7 +213,7 @@ static void tcm_loop_submission_work(struct work_struct
*work)
}
- transfer_length = scsi_transfer_length(sc);
+ transfer_length = scsi_transfer_length(sc, scsi_out(sc));
if (!scsi_prot_sg_count(sc) &&
scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
se_cmd->prot_pto = true;
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 73f349044941..42e62cfff515 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -313,9 +313,10 @@ static inline void set_driver_byte(struct scsi_cmnd *cmd,
char status)
cmd->result = (cmd->result & 0x00ffffff) | (status << 24);
}
-static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
+static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd,
+ struct scsi_data_buffer *sdb)
{
- unsigned int xfer_len = scsi_out(scmd)->length;
+ unsigned int xfer_len = sdb->length;
unsigned int prot_op = scsi_get_prot_op(scmd);
unsigned int sector_size = scmd->device->sector_size;
--
1.9.3
--
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