scsi: target: ibmvscsi_tgt: Convert to new submission API

target_submit_cmd() is now only for simple drivers that do their own sync
during shutdown and do not use target_stop_session(). It will never return
a failure, so we can remove that code from the driver.

Link: https://lore.kernel.org/r/20210227170006.5077-7-michael.christie@oracle.com
Cc: Michael Cyr <mikecyr@linux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c

@@ -2670,7 +2670,6 @@ static void ibmvscsis_parse_cmd(struct scsi_info *vscsi,
 	u64 data_len = 0;
 	enum dma_data_direction dir;
 	int attr = 0;
-	int rc = 0;
 
 	nexus = vscsi->tport.ibmv_nexus;
 	/*
@@ -2725,17 +2724,9 @@ static void ibmvscsis_parse_cmd(struct scsi_info *vscsi,
 
 	srp->lun.scsi_lun[0] &= 0x3f;
 
-	rc = target_submit_cmd(&cmd->se_cmd, nexus->se_sess, srp->cdb,
+	target_submit_cmd(&cmd->se_cmd, nexus->se_sess, srp->cdb,
 			  cmd->sense_buf, scsilun_to_int(&srp->lun),
 			  data_len, attr, dir, 0);
-	if (rc) {
-		dev_err(&vscsi->dev, "target_submit_cmd failed, rc %d\n", rc);
-		spin_lock_bh(&vscsi->intr_lock);
-		list_del(&cmd->list);
-		ibmvscsis_free_cmd_resources(vscsi, cmd);
-		spin_unlock_bh(&vscsi->intr_lock);
-		goto fail;
-	}
 	return;
 
 fail: