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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); 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 pdev is a struct pci_dev *. This may be called in interrupt context.
where devices don't have struct pci_dev (like ISA, EISA). This may be You should use dma_alloc_coherent (see DMA-API.txt) for buses
called in interrupt context. where devices don't have struct pci_dev (like ISA, EISA).
This argument is needed because the DMA translations may be bus This argument is needed because the DMA translations may be bus
specific (and often is private to the bus which the device is attached specific (and often is private to the bus which the device is attached