kernels/linux-2.4.0/include/asm-i386/pci.h
/* Make physical memory consistent for a single
 * streaming mode DMA translation after a transfer.
 *
 * If you perform a pci_map_single() but wish to interrogate the
 * buffer using the cpu, yet do not wish to teardown the PCI dma
 * mapping, you must call this function before doing so.  At the
 * next point you give the PCI dma address back to the card, the
 * device again owns the buffer.
 */
Make physical memory consistent for a single
streaming mode DMA translation after a transfer.

If you perform a pci_map_single() but wish to interrogate the
buffer using the cpu, yet do not wish to teardown the PCI dma
mapping, you must call this function before doing so.  At the
next point you give the PCI dma address back to the card, the
device again owns the buffer.
Make physical memory consistent for a single streaming mode DMA translation after a transfer . If you perform a pci_map_single () but wish to interrogate the buffer using the cpu yet do not wish to teardown the PCI dma mapping you must call this function before doing so . At the next point you give the PCI dma address back to the card the device again owns the buffer .
extern inline void pci_dma_sync_single(struct pci_dev *hwdev,
				       dma_addr_t dma_handle,
				       size_t size, int direction)
{
	if (direction == PCI_DMA_NONE)
		BUG();
}
extern inline void pci_dma_sync_single ( struct pci_dev * hwdev , dma_addr_t dma_handle , size_t size , int direction ) { if ( direction == PCI_DMA_NONE ) BUG ( ) ; }
Make physical memory consistent for a single
 streaming mode DMA translation after a transfer.
Make physical memory consistent for a single streaming mode DMA translation after a transfer .
/* Nothing to do */