target: remove the t_se_count field in struct se_cmd

Now that tasks are gone we are guaranteed to only get a single completion
per command, and thus don't need this counter.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_transport.c

@@ -3284,11 +3284,6 @@ static void transport_put_cmd(struct se_cmd *cmd)
 			goto out_busy;
 	}
 
-	if (atomic_read(&cmd->t_se_count)) {
-		if (!atomic_dec_and_test(&cmd->t_se_count))
-			goto out_busy;
-	}
-
 	if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
 		cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
 		target_remove_from_state_list(cmd);
@@ -3498,7 +3493,6 @@ int transport_generic_new_cmd(struct se_cmd *cmd)
 	}
 
 	atomic_inc(&cmd->t_fe_count);
-	atomic_inc(&cmd->t_se_count);
 
 	/*
 	 * For WRITEs, let the fabric know its buffer is ready.

include/target/target_core_base.h

@@ -548,7 +548,6 @@ struct se_cmd {
 	unsigned char		__t_task_cdb[TCM_MAX_COMMAND_SIZE];
 	unsigned long long	t_task_lba;
 	atomic_t		t_fe_count;
-	atomic_t		t_se_count;
 	unsigned int		transport_state;
 #define CMD_T_ABORTED		(1 << 0)
 #define CMD_T_ACTIVE		(1 << 1)