dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
ata_pad_free(ap, dev);
void ata_port_stop (struct ata_port *ap){	struct device *dev = ap->host_set->dev;	dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);	dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);}