target: go through normal processing for zero-length REQUEST_SENSE

Now that spc_emulate_request_sense has been taught to process zero-length
REQUEST SENSE correctly, drop the special handling of unit attention
conditions from transport_generic_new_cmd. However, for now REQUEST SENSE
will be the only command that goes through emulation for zero lengths.

(nab: Fix up zero-length check in transport_generic_new_cmd)

Signed-off-by: Paolo Bonzini <[e-mail]>
Signed-off-by: Nicholas Bellinger <[e-mail]>

drivers/target/target_core_transport.c

···
 	 * away.
 	 */
 	if (!cmd->data_length &&
-	    (cmd->se_dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV ||
-	     cmd->t_task_cdb[0] == REPORT_LUNS) {
+	    cmd->t_task_cdb[0] != REQUEST_SENSE &&
+	    cmd->se_dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
 		spin_lock_irq(&cmd->t_state_lock);
 		cmd->t_state = TRANSPORT_COMPLETE;
 		cmd->transport_state |= CMD_T_ACTIVE;
 		spin_unlock_irq(&cmd->t_state_lock);
-
-		if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
-			u8 ua_asc = 0, ua_ascq = 0;
-
-			core_scsi3_ua_clear_for_request_sense(cmd,
-					&ua_asc, &ua_ascq);
-		}
 
 		INIT_WORK(&cmd->work, target_complete_ok_work);
 		queue_work(target_completion_wq, &cmd->work);