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    SubjectRe: USB mass storage and ARM cache coherency
    Am Dienstag, 2. Februar 2010 15:42:49 schrieb Clemens Ladisch:
    > > Or... usb-audio? I should have verified that it is using bulk endpoints
    > > (and thus the patch applies to my case).
    > > usb-audio probably uses isochronous transfers, thus that would be
    > > an obvious reason why the patch didn't work for me.
    > snd-usb-audio indeed uses isochronous transfers, but those buffers are
    > never mapped into user space. The intermediate vmalloc()ed buffer is,
    > however, and there was a bugfix for this recently. Do you have these
    > patches in your tree?

    Now that I think about it, several video drivers do map it to user space.


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