Re: [linux-usb-devel] Bulk URB submission.

[David Brownell]

> The main problem with the data memory is simply that some locations are not
> guaranteed to map continuosly to PCI space, so that accidently crossing a
> page boundary may fail.

That sounds like an issue that pci_map_single() and siblings should
be addressing ... but the last time I checked, on x86 they were just
wrappers around virt_to_bus(), and couldn't report errors.  (Some
other platforms have more complex implementations...)  The API
docs didn't mention any such issues either.

Is there a complete list of those locations ("not guaranteed to map
continuously to PCI space")?

- Dave





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