target: remove the execute list

Since "target: Drop se_device TCQ queue_depth usage from I/O path" we always
submit all commands (or back then, tasks) from __transport_execute_tasks.

That means the the execute list has lots its purpose, as we can simply
submit the commands that are restarted in transport_complete_task_attr
directly while we walk the list.  In fact doing so also solves a race
in the way it currently walks to delayed_cmd_list as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_internal.h

@@ -93,7 +93,6 @@ void	release_se_kmem_caches(void);
 u32	scsi_get_new_index(scsi_index_t);
 void	transport_subsystem_check_init(void);
 void	transport_cmd_finish_abort(struct se_cmd *, int);
-void	__target_remove_from_execute_list(struct se_cmd *);
 unsigned char *transport_dump_cmd_direction(struct se_cmd *);
 void	transport_dump_dev_state(struct se_device *, char *, int *);
 void	transport_dump_dev_info(struct se_device *, struct se_lun *,

drivers/target/target_core_tmr.c

@@ -295,9 +295,6 @@ static void core_tmr_drain_state_list(
 
 		list_move_tail(&cmd->state_list, &drain_task_list);
 		cmd->state_active = false;
-
-		if (!list_empty(&cmd->execute_list))
-			__target_remove_from_execute_list(cmd);
 	}
 	spin_unlock_irqrestore(&dev->execute_task_lock, flags);