Re: [PATCH] isp1760: Flush the D-cache for the pipe-in transfer buffers

[Sebastian Andrzej Siewior <bigeasy@linutronix.de>]

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