diff options
Diffstat (limited to 'Documentation/DMA-mapping.txt')
| -rw-r--r-- | Documentation/DMA-mapping.txt | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/DMA-mapping.txt b/Documentation/DMA-mapping.txt index ee4bb73683cd..10bf4deb96aa 100644 --- a/Documentation/DMA-mapping.txt +++ b/Documentation/DMA-mapping.txt @@ -194,7 +194,7 @@ document for how to handle this case. Finally, if your device can only drive the low 24-bits of address during PCI bus mastering you might do something like: - if (pci_set_dma_mask(pdev, 0x00ffffff)) { + if (pci_set_dma_mask(pdev, DMA_24BIT_MASK)) { printk(KERN_WARNING "mydev: 24-bit DMA addressing not available.\n"); goto ignore_this_device; @@ -212,7 +212,7 @@ functions (for example a sound card provides playback and record functions) and the various different functions have _different_ DMA addressing limitations, you may wish to probe each mask and only provide the functionality which the machine can handle. It -is important that the last call to pci_set_dma_mask() be for the +is important that the last call to pci_set_dma_mask() be for the most specific mask. Here is pseudo-code showing how this might be done: |