From: Matti Linnanvuori Date: Mon, 28 Apr 2008 16:33:27 +0000 (-0700) Subject: doc: fix an incorrect suggestion to pass NULL for PCI like buses X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=97a34eb77c758ff7821c2d29b3b5a84299c93aa1;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git 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 Acked-by: Matthew Wilcox Signed-off-by: Jesse Barnes --- diff --git a/Documentation/DMA-mapping.txt b/Documentation/DMA-mapping.txt index b49427aa851..d8347c1fd03 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