struct request_queue *q = cmd->device->request_queue;
struct scsi_device *sdev = cmd->device; struct request_queue *q = sdev->request_queue;   get_device(&sdev->sdev_gendev);
void scsi_next_command(struct scsi_cmnd *cmd){	struct request_queue *q = cmd->device->request_queue;	scsi_put_command(cmd);	scsi_run_queue(q);}