aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--Documentation/block/biodoc.txt4
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
1163As mentioned, there is no virtual mapping of a bio. For DMA, this is 1163As mentioned, there is no virtual mapping of a bio. For DMA, this is
1164not a problem as the driver probably never will need a virtual mapping. 1164not a problem as the driver probably never will need a virtual mapping.
1165Instead it needs a bus mapping (pci_map_page for a single segment or 1165Instead it needs a bus mapping (dma_map_page for a single segment or
1166use blk_rq_map_sg for scatter gather) to be able to ship it to the driver. For 1166use dma_map_sg for scatter gather) to be able to ship it to the driver. For
1167PIO drivers (or drivers that need to revert to PIO transfer once in a 1167PIO drivers (or drivers that need to revert to PIO transfer once in a
1168while (IDE for example)), where the CPU is doing the actual data 1168while (IDE for example)), where the CPU is doing the actual data
1169transfer a virtual mapping is needed. If the driver supports highmem I/O, 1169transfer a virtual mapping is needed. If the driver supports highmem I/O,