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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>
This commit is contained in:
Matti Linnanvuori 2008-04-28 09:33:27 -07:00 committed by Jesse Barnes
parent 819e32377e
commit 97a34eb77c
1 changed files with 3 additions and 3 deletions
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6
Documentation/DMA-mapping.txt
View File

@ -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