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Red Hat Bugzilla – Attachment 311255 Details for
Bug 454417
Inconsistent documentation regarding pci_alloc_consistent
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[patch]
RHEL4 fix for this issue
patch.patch (text/plain), 833 bytes, created by
Prarit Bhargava
on 2008-07-08 12:01:41 UTC
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Description:
RHEL4 fix for this issue
Filename:
MIME Type:
Creator:
Prarit Bhargava
Created:
2008-07-08 12:01:41 UTC
Size:
833 bytes
patch
obsolete
>diff --git a/Documentation/DMA-mapping.txt b/Documentation/DMA-mapping.txt >index f4ac37f..dac68bf 100644 >--- a/Documentation/DMA-mapping.txt >+++ b/Documentation/DMA-mapping.txt >@@ -339,13 +339,6 @@ pci_alloc_consistent returns two values: the virtual address which you > can use to access it from the CPU and dma_handle which you pass to the > card. > >-The cpu return address and the DMA bus master address are both >-guaranteed to be aligned to the smallest PAGE_SIZE order which >-is greater than or equal to the requested size. This invariant >-exists (for example) to guarantee that if you allocate a chunk >-which is smaller than or equal to 64 kilobytes, the extent of the >-buffer you receive will not cross a 64K boundary. >- > To unmap and free such a DMA region, you call: > > pci_free_consistent(dev, size, cpu_addr, dma_handle);
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