Sreekanth, > We need to satisfy this condition on those system where 32 bit dma > consistent mask is not supported and it only supports 64 bit dma > consistent mask. So on these system we can't set > pci_set_consistent_dma_mask() to DMA_BIT_MASK(32). Which systems are you talking about? It seems a bit unrealistic to require all devices to support 64-bit DMA. -- Martin K. Petersen Oracle Linux Engineering