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    SubjectRe: [PATCH] isp1760: Flush the D-cache for the pipe-in transfer buffers
    Ming Lei wrote:
    > 2010/2/2 Catalin Marinas <catalin.marinas@arm.com>:
    >
    >> + if (usb_pipein(urb->pipe) && usb_pipetype(urb->pipe) == PIPE_BULK) {
    >> + void *ptr;
    >> + for (ptr = urb->transfer_buffer;
    >> + ptr < urb->transfer_buffer + urb->transfer_buffer_length;
    >> + ptr += PAGE_SIZE)
    >> + flush_dcache_page(virt_to_page(ptr));
    >
    > If the page is mapped into highmem, seems virt_to_page doesn't work well.

    This does not matter because this can not happen :). If the buffer is
    highmem then a bounce buffer is used. See commit 96983d2d8 aka "USB:
    storage: set bounce limit for non-DMA-capable host controllers"


    Sebastian


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