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authorMatti Linnanvuori <mattilinnanvuori@yahoo.com>2008-04-28 09:33:27 -0700
committerJesse Barnes <jbarnes@hobbes.lan>2008-04-28 10:07:28 -0700
commit97a34eb77c758ff7821c2d29b3b5a84299c93aa1 (patch)
tree4dc366d87f30471de8e00070d51fa4ad9f80ca51 /Documentation/DMA-mapping.txt
parent819e32377e401669d2c010f1a0ce12fe43ea5261 (diff)
doc: fix an incorrect suggestion to pass NULL for PCI like buses
Fix an incorrect suggestion to pass NULL to pci_alloc_consistent for PCI like buses where devices don't have struct pci_dev (like ISA, EISA). Signed-off-by: Matti Linnanvuori <mattilinnanvuori@yahoo.com> Acked-by: Matthew Wilcox <willy@linux.intel.com> Signed-off-by: Jesse Barnes <jbarnes@hobbes.lan>
Diffstat (limited to 'Documentation/DMA-mapping.txt')
-rw-r--r--Documentation/DMA-mapping.txt6
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/DMA-mapping.txt b/Documentation/DMA-mapping.txt
index b49427aa8510..d8347c1fd032 100644
--- a/Documentation/DMA-mapping.txt
+++ b/Documentation/DMA-mapping.txt
@@ -317,9 +317,9 @@ you should do:
cpu_addr = pci_alloc_consistent(pdev, size, &dma_handle);
-where pdev is a struct pci_dev *. You should pass NULL for PCI like buses
-where devices don't have struct pci_dev (like ISA, EISA). This may be
-called in interrupt context.
+where pdev is a struct pci_dev *. This may be called in interrupt context.
+You should use dma_alloc_coherent (see DMA-API.txt) for buses
+where devices don't have struct pci_dev (like ISA, EISA).
This argument is needed because the DMA translations may be bus
specific (and often is private to the bus which the device is attached