scsi_release_buffers(cmd);
static void scsi_unprep_request(struct request *req){	struct scsi_cmnd *cmd = req->special;	req->flags &= ~REQ_DONTPREP;	req->special = (req->flags & REQ_SPECIAL) ? cmd->sc_request : NULL;	scsi_release_buffers(cmd);	scsi_put_command(cmd);}