diff options
Diffstat (limited to 'drivers/block/rsxx/dma.c')
| -rw-r--r-- | drivers/block/rsxx/dma.c | 43 |
1 files changed, 23 insertions, 20 deletions
diff --git a/drivers/block/rsxx/dma.c b/drivers/block/rsxx/dma.c index 34fd1018c8e5..4103601ae675 100644 --- a/drivers/block/rsxx/dma.c +++ b/drivers/block/rsxx/dma.c @@ -434,26 +434,29 @@ static void rsxx_issue_dmas(struct rsxx_dma_ctrl *ctrl) continue; } - if (dma->cmd == HW_CMD_BLK_WRITE) - dir = PCI_DMA_TODEVICE; - else - dir = PCI_DMA_FROMDEVICE; - - /* - * The function pci_map_page is placed here because we can - * only, by design, issue up to 255 commands to the hardware - * at one time per DMA channel. So the maximum amount of mapped - * memory would be 255 * 4 channels * 4096 Bytes which is less - * than 2GB, the limit of a x8 Non-HWWD PCIe slot. This way the - * pci_map_page function should never fail because of a - * lack of mappable memory. - */ - dma->dma_addr = pci_map_page(ctrl->card->dev, dma->page, - dma->pg_off, dma->sub_page.cnt << 9, dir); - if (pci_dma_mapping_error(ctrl->card->dev, dma->dma_addr)) { - push_tracker(ctrl->trackers, tag); - rsxx_complete_dma(ctrl, dma, DMA_CANCELLED); - continue; + if (dma->cmd != HW_CMD_BLK_DISCARD) { + if (dma->cmd == HW_CMD_BLK_WRITE) + dir = PCI_DMA_TODEVICE; + else + dir = PCI_DMA_FROMDEVICE; + + /* + * The function pci_map_page is placed here because we + * can only, by design, issue up to 255 commands to the + * hardware at one time per DMA channel. So the maximum + * amount of mapped memory would be 255 * 4 channels * + * 4096 Bytes which is less than 2GB, the limit of a x8 + * Non-HWWD PCIe slot. This way the pci_map_page + * function should never fail because of a lack of + * mappable memory. + */ + dma->dma_addr = pci_map_page(ctrl->card->dev, dma->page, + dma->pg_off, dma->sub_page.cnt << 9, dir); + if (pci_dma_mapping_error(ctrl->card->dev, dma->dma_addr)) { + push_tracker(ctrl->trackers, tag); + rsxx_complete_dma(ctrl, dma, DMA_CANCELLED); + continue; + } } set_tracker_dma(ctrl->trackers, tag, dma); |