scsi: target: Introduce transport_init_session()

Other than initializing xcopy_pt_sess.sess_wait_list, this patch does not
change any functionality.

Signed-off-by: Bart Van Assche <[e-mail]>
Reviewed-by: Mike Christie <[e-mail]>
Cc: Mike Christie <[e-mail]>
Cc: Christoph Hellwig <[e-mail]>
Cc: Hannes Reinecke <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/target/target_core_transport.c

···
 }
 
 /**
+ * transport_init_session - initialize a session object
+ * @se_sess: Session object pointer.
+ *
+ * The caller must have zero-initialized @se_sess before calling this function.
+ */
+void transport_init_session(struct se_session *se_sess)
+{
+	INIT_LIST_HEAD(&se_sess->sess_list);
+	INIT_LIST_HEAD(&se_sess->sess_acl_list);
+	INIT_LIST_HEAD(&se_sess->sess_cmd_list);
+	INIT_LIST_HEAD(&se_sess->sess_wait_list);
+	spin_lock_init(&se_sess->sess_cmd_lock);
+}
+EXPORT_SYMBOL(transport_init_session);
+
+/**
  * transport_alloc_session - allocate a session object and initialize it
  * @sup_prot_ops: bitmask that defines which T10-PI modes are supported.
  */
···
 				" se_sess_cache\n");
 		return ERR_PTR(-ENOMEM);
 	}
-	INIT_LIST_HEAD(&se_sess->sess_list);
-	INIT_LIST_HEAD(&se_sess->sess_acl_list);
-	INIT_LIST_HEAD(&se_sess->sess_cmd_list);
-	INIT_LIST_HEAD(&se_sess->sess_wait_list);
-	spin_lock_init(&se_sess->sess_cmd_lock);
+	transport_init_session(se_sess);
 	se_sess->sup_prot_ops = sup_prot_ops;
 
 	return se_sess;

drivers/target/target_core_xcopy.c

···
 	INIT_LIST_HEAD(&xcopy_pt_nacl.acl_list);
 	INIT_LIST_HEAD(&xcopy_pt_nacl.acl_sess_list);
 	memset(&xcopy_pt_sess, 0, sizeof(struct se_session));
-	INIT_LIST_HEAD(&xcopy_pt_sess.sess_list);
-	INIT_LIST_HEAD(&xcopy_pt_sess.sess_acl_list);
-	INIT_LIST_HEAD(&xcopy_pt_sess.sess_cmd_list);
-	spin_lock_init(&xcopy_pt_sess.sess_cmd_lock);
+	transport_init_session(&xcopy_pt_sess);
 
 	xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg;
 	xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess;

include/target/target_core_fabric.h

···
 		int (*callback)(struct se_portal_group *,
 				struct se_session *, void *));
 
+void transport_init_session(struct se_session *);
 struct se_session *transport_alloc_session(enum target_prot_op);
 int transport_alloc_session_tags(struct se_session *, unsigned int,
 		unsigned int);