1147     if (!(slave = ec_master_find_slave(master, 0, io.slave_position))) {

  1147     if (io.emergency) {

  1148         up(&master->master_sem);

  1148         request.ring_position = io.slave_position;

  1149         ec_reg_request_clear(&request);

  1149         // schedule request.

  1150         EC_MASTER_ERR(master, "Slave %u does not exist!\n",

  1150         list_add_tail(&request.list, &master->emerg_reg_requests);

  1151                 io.slave_position);

  1151     }

  1152         return -EINVAL;

  1152     else {

  1153     }

  1153         if (!(slave = ec_master_find_slave(master, 0, io.slave_position))) {

  1154 

  1154             up(&master->master_sem);

  1155     // schedule request.

  1155             ec_reg_request_clear(&request);

  1156     list_add_tail(&request.list, &slave->reg_requests);

  1156             EC_MASTER_ERR(master, "Slave %u does not exist!\n",

  1157                     io.slave_position);

  1158             return -EINVAL;

  1159         }

  1160 

  1161         // schedule request.

  1162         list_add_tail(&request.list, &slave->reg_requests);

  1163     }