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    SubjectRe: USB mass storage and ARM cache coherency
    On Mon, 2010-02-08 at 07:33 +0000, Andreas Mohr wrote:
    > On Mon, Feb 08, 2010 at 07:55:19AM +0100, Pavel Machek wrote:
    > > Plus it does unneccessary flushes on x86, etc...
    > Noticed that as well, there should be an arch-obeying helper for this.
    > On my MIPSEL, I had urb->transfer_buffer NULL ptr crashes
    > (I think that was expected in case of a certain DMA setup, Alan said).
    > However, even with NULL check added I still had:
    > hub 2-1.1:1.0: state 7 ports 7 chg 0000 evt 0010
    > Unhandled kernel unaligned access[#1]:

    Just to avoid confusion - that's a similar patch applied to a different
    driver. The ISP1760 HCD driver works fine with my patch (transfer_buffer
    never seems to be NULL with latest mainline). I can't comment on the
    ehci-q.c driver (it looks like it has some support for DMA while my
    patch only applies to PIO drivers where transfer_buffer should be set).


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