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SubjectRe: how to get virtual address from dma address
On Wed, Oct 03, 2001 at 02:48:58PM -0700, Linux Bigot wrote:
> oops! I am sorry. I did not meant "pci_unmap_single"
> pci_unmap_single.
>
> I meant to get a routine which does exactly opposite
> of what pci_map_single does, i.e., give me a virtual
> address for a dma address.

pci_unmap_single is the exact opposite of pci_map_single. It unmaps a
memory region. It just doesn't do what you want.

Bottom line, to keep your driver portable, you are going to have to keep
a mapping of the dma and real addresses either in a structure as most
drivers do, or as a hash like a couple difficult ones do.


Ben

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