scsi: target: Fix ordered CMD_T_SENT handling

We can race where target_handle_task_attr() has put the cmd on the
delayed_cmd_list. Then target_restart_delayed_cmds() has removed it and set
CMD_T_SENT, but then target_execute_cmd() now clears that bit.

This patch moves the clearing to before we've put the cmd on the list.

Link: https://lore.kernel.org/r/20210930020422.92578-2-michael.christie@oracle.comReviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/target/target_core_transport.c

@@ -2200,6 +2200,10 @@ static bool target_handle_task_attr(struct se_cmd *cmd)
 	if (atomic_read(&dev->dev_ordered_sync) == 0)
 		return false;
 
+	spin_lock_irq(&cmd->t_state_lock);
+	cmd->transport_state &= ~CMD_T_SENT;
+	spin_unlock_irq(&cmd->t_state_lock);
+
 	spin_lock(&dev->delayed_cmd_lock);
 	list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
 	spin_unlock(&dev->delayed_cmd_lock);
@@ -2228,12 +2232,8 @@ void target_execute_cmd(struct se_cmd *cmd)
 	if (target_write_prot_action(cmd))
 		return;
 
-	if (target_handle_task_attr(cmd)) {
-		spin_lock_irq(&cmd->t_state_lock);
-		cmd->transport_state &= ~CMD_T_SENT;
-		spin_unlock_irq(&cmd->t_state_lock);
+	if (target_handle_task_attr(cmd))
 		return;
-	}
 
 	__target_execute_cmd(cmd, true);
 }