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authorAnton Vorontsov <cbouatmailru@gmail.com>2012-01-04 09:09:35 +0400
committerAnton Vorontsov <cbouatmailru@gmail.com>2012-01-04 09:09:35 +0400
commit251f39fe42dae863bd24e30864e6b66076ba076d (patch)
treec804944bc17f3836d19cc8b5bc611dd1fb0ea915 /Documentation/usb/dma.txt
parent9b8872273af6983b246252a6508fa7cf34c69d6e (diff)
parent35b4c01e29bdd9632dabf9784ed3486333f00427 (diff)
Merge branch 'power-supply-scope' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen
Diffstat (limited to 'Documentation/usb/dma.txt')
-rw-r--r--Documentation/usb/dma.txt6
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/usb/dma.txt b/Documentation/usb/dma.txt
index 84ef865237d..444651e70d9 100644
--- a/Documentation/usb/dma.txt
+++ b/Documentation/usb/dma.txt
@@ -7,7 +7,7 @@ API OVERVIEW
The big picture is that USB drivers can continue to ignore most DMA issues,
though they still must provide DMA-ready buffers (see
-Documentation/PCI/PCI-DMA-mapping.txt). That's how they've worked through
+Documentation/DMA-API-HOWTO.txt). That's how they've worked through
the 2.4 (and earlier) kernels.
OR: they can now be DMA-aware.
@@ -57,7 +57,7 @@ and effects like cache-trashing can impose subtle penalties.
force a consistent memory access ordering by using memory barriers. It's
not using a streaming DMA mapping, so it's good for small transfers on
systems where the I/O would otherwise thrash an IOMMU mapping. (See
- Documentation/PCI/PCI-DMA-mapping.txt for definitions of "coherent" and
+ Documentation/DMA-API-HOWTO.txt for definitions of "coherent" and
"streaming" DMA mappings.)
Asking for 1/Nth of a page (as well as asking for N pages) is reasonably
@@ -88,7 +88,7 @@ WORKING WITH EXISTING BUFFERS
Existing buffers aren't usable for DMA without first being mapped into the
DMA address space of the device. However, most buffers passed to your
driver can safely be used with such DMA mapping. (See the first section
-of Documentation/PCI/PCI-DMA-mapping.txt, titled "What memory is DMA-able?")
+of Documentation/DMA-API-HOWTO.txt, titled "What memory is DMA-able?")
- When you're using scatterlists, you can map everything at once. On some
systems, this kicks in an IOMMU and turns the scatterlists into single