From 410f670202f0f13cdac8459b9c3effeeead135d1 Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Tue, 22 Nov 2011 13:51:32 -0800 Subject: [PATCH] target: Don't return an error status for 0-length READ and WRITE 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 Cc: stable@kernel.org Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_transport.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 0bdb6ba..1b760a0 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -3770,8 +3770,15 @@ 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); -- 2.7.4