On Tue, 2010-02-02 at 15:41 +0000, Ming Lei wrote:
> 2010/2/2 Catalin Marinas <catalin.marinas@xxxxxxx>:
>
> > + 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.
You are right but is it possible that we get a highmem virtual address
in this case?
As for a general solution, maybe trying to define something like a pio_*
API would work better.
--
Catalin
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