On Wed, May 06, 2020 at 05:56:47PM -0700, gavinli@xxxxxxxxxxxxxx wrote:
> From: Gavin Li <gavinli@xxxxxxxxxxxxxx>
>
> On architectures that are not (or are optionally) DMA coherent,
> dma_alloc_coherent() returns an address into the vmalloc space,
> and calling virt_to_phys() on this address returns an unusable
> physical address.
>
> This patch replaces the raw remap_pfn_range() call with a call to
> dmap_mmap_coherent(), which takes care of the differences between
> coherent and non-coherent code paths.
>
> Tested on an arm64 rk3399 board.
> ---
> drivers/usb/core/devio.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
I don't think you ran checkpatch.pl on your patch :(
Also, please see 2bef9aed6f0e ("usb: usbfs: correct kernel->user page
attribute mismatch") in linux-next, does that resolve this problem for
you? I think it does the same thing as your patch does...
thanks,
greg k-h
