diff options
Diffstat (limited to 'Documentation/block/biodoc.txt')
-rw-r--r-- | Documentation/block/biodoc.txt | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt index 6fab97ea7e6b..508b5b2b0289 100644 --- a/Documentation/block/biodoc.txt +++ b/Documentation/block/biodoc.txt | |||
@@ -1162,8 +1162,8 @@ where a driver received a request ala this before: | |||
1162 | 1162 | ||
1163 | As mentioned, there is no virtual mapping of a bio. For DMA, this is | 1163 | As mentioned, there is no virtual mapping of a bio. For DMA, this is |
1164 | not a problem as the driver probably never will need a virtual mapping. | 1164 | not a problem as the driver probably never will need a virtual mapping. |
1165 | Instead it needs a bus mapping (pci_map_page for a single segment or | 1165 | Instead it needs a bus mapping (dma_map_page for a single segment or |
1166 | use blk_rq_map_sg for scatter gather) to be able to ship it to the driver. For | 1166 | use dma_map_sg for scatter gather) to be able to ship it to the driver. For |
1167 | PIO drivers (or drivers that need to revert to PIO transfer once in a | 1167 | PIO drivers (or drivers that need to revert to PIO transfer once in a |
1168 | while (IDE for example)), where the CPU is doing the actual data | 1168 | while (IDE for example)), where the CPU is doing the actual data |
1169 | transfer a virtual mapping is needed. If the driver supports highmem I/O, | 1169 | transfer a virtual mapping is needed. If the driver supports highmem I/O, |