ieee1394: sbp2: optimize DMA direction of command ORBs Only the driver writes ORBs, the device just reads them. Therefore PCI_DMA_BIDIRECTIONAL can be replaced by PCI_DMA_TODEVICE which may be cheaper on some architectures. Signed-off-by: Stefan Richter --- drivers/ieee1394/sbp2.c | 16 ++++++++-------- 1 files changed, 8 insertions(+), 8 deletions(-) TODO: Convert sbp2 from PCI DMA to generic DMA mapping. Index: linux/drivers/ieee1394/sbp2.c =================================================================== --- linux.orig/drivers/ieee1394/sbp2.c 2006-07-23 10:16:57.000000000 +0200 +++ linux/drivers/ieee1394/sbp2.c 2006-07-23 10:19:29.000000000 +0200 @@ -492,7 +492,7 @@ static int sbp2util_create_command_orb_p command->command_orb_dma = pci_map_single(hi->host->pdev, &command->command_orb, sizeof(struct sbp2_command_orb), - PCI_DMA_BIDIRECTIONAL); + PCI_DMA_TODEVICE); SBP2_DMA_ALLOC("single command orb DMA"); command->sge_dma = pci_map_single(hi->host->pdev, @@ -525,7 +525,7 @@ static void sbp2util_remove_command_orb_ /* Release our generic DMA's */ pci_unmap_single(host->pdev, command->command_orb_dma, sizeof(struct sbp2_command_orb), - PCI_DMA_BIDIRECTIONAL); + PCI_DMA_TODEVICE); SBP2_DMA_FREE("single command orb DMA"); pci_unmap_single(host->pdev, command->sge_dma, sizeof(command->scatter_gather_element), @@ -1982,7 +1982,7 @@ static void sbp2_link_orb_command(struct pci_dma_sync_single_for_device(hi->host->pdev, command->command_orb_dma, sizeof(struct sbp2_command_orb), - PCI_DMA_BIDIRECTIONAL); + PCI_DMA_TODEVICE); pci_dma_sync_single_for_device(hi->host->pdev, command->sge_dma, sizeof(command->scatter_gather_element), PCI_DMA_BIDIRECTIONAL); @@ -2012,14 +2012,14 @@ static void sbp2_link_orb_command(struct */ pci_dma_sync_single_for_cpu(hi->host->pdev, last_orb_dma, sizeof(struct sbp2_command_orb), - PCI_DMA_BIDIRECTIONAL); + PCI_DMA_TODEVICE); last_orb->next_ORB_lo = cpu_to_be32(command->command_orb_dma); wmb(); /* Tells hardware that this pointer is valid */ last_orb->next_ORB_hi = 0; pci_dma_sync_single_for_device(hi->host->pdev, last_orb_dma, sizeof(struct sbp2_command_orb), - PCI_DMA_BIDIRECTIONAL); + PCI_DMA_TODEVICE); addr += SBP2_DOORBELL_OFFSET; data[0] = 0; length = 4; @@ -2176,7 +2176,7 @@ static int sbp2_handle_status_write(stru SBP2_DEBUG("Found status for command ORB"); pci_dma_sync_single_for_cpu(hi->host->pdev, command->command_orb_dma, sizeof(struct sbp2_command_orb), - PCI_DMA_BIDIRECTIONAL); + PCI_DMA_TODEVICE); pci_dma_sync_single_for_cpu(hi->host->pdev, command->sge_dma, sizeof(command->scatter_gather_element), PCI_DMA_BIDIRECTIONAL); @@ -2365,7 +2365,7 @@ static void sbp2scsi_complete_all_comman command = list_entry(lh, struct sbp2_command_info, list); pci_dma_sync_single_for_cpu(hi->host->pdev, command->command_orb_dma, sizeof(struct sbp2_command_orb), - PCI_DMA_BIDIRECTIONAL); + PCI_DMA_TODEVICE); pci_dma_sync_single_for_cpu(hi->host->pdev, command->sge_dma, sizeof(command->scatter_gather_element), PCI_DMA_BIDIRECTIONAL); @@ -2548,7 +2548,7 @@ static int sbp2scsi_abort(struct scsi_cm pci_dma_sync_single_for_cpu(hi->host->pdev, command->command_orb_dma, sizeof(struct sbp2_command_orb), - PCI_DMA_BIDIRECTIONAL); + PCI_DMA_TODEVICE); pci_dma_sync_single_for_cpu(hi->host->pdev, command->sge_dma, sizeof(command->scatter_gather_element),