From: Roland Dreier <roland@xxxxxxxxxxxxxxx>
IO commands with a TRANSFER LENGTH of 0 are not an error; for example,
for READ (10) and WRITE (10), SBC-3 says:
A TRANSFER LENGTH field set to zero specifies that no logical blocks
shall be read. This condition shall not be considered an error.
In case we have nothing to do, just complete the command with good status.
Signed-off-by: Roland Dreier <roland@xxxxxxxxxxxxxxx>
---
drivers/target/target_core_transport.c | 9 ++++++++-
1 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index e517429..7a97e98 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -3792,8 +3792,15 @@ int transport_generic_new_cmd(struct se_cmd *cmd)
task_cdbs = transport_allocate_control_task(cmd);
}
- if (task_cdbs <= 0)
+ if (task_cdbs < 0)
goto out_fail;
+ else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
+ cmd->t_state = TRANSPORT_COMPLETE;
+ atomic_set(&cmd->t_transport_active, 1);
+ INIT_WORK(&cmd->work, target_complete_ok_work);
+ queue_work(target_completion_wq, &cmd->work);
+ return 0;
+ }
if (set_counts) {
atomic_inc(&cmd->t_fe_count);
--
1.7.5.4
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