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    SubjectRe: USB mass storage and ARM cache coherency
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    On Tue, 2010-02-02 at 13:36 +0000, Ming Lei wrote:
    > 2010/2/2 Catalin Marinas <catalin.marinas@arm.com>:
    >
    > > In the iSCSI case, does the HCD driver write directly to a page cache
    > > page? Or it just fills in network packets that are copied to page cache
    > > pages by the iSCSI code (sorry, I'm not familiar with this part of the
    > > kernel). If the latter, the cache flushing in the HCD driver would not
    > > help and it needs to be done in the iSCSI code.
    >
    > So we should flush dcache page in the place where the user mapped
    > page is copied to, instead of low level driver which does not do such
    > thing always.

    Or both if you can't be sure whether the driver copies directly to a
    page cache page.

    --
    Catalin



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