On Thu, Aug 01, 2019 at 03:04:36PM -0700, gavinli@xxxxxxxxxxxxxx wrote: > From: Gavin Li <git@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. > > Signed-off-by: Gavin Li <git@xxxxxxxxxxxxxx> > --- > drivers/usb/core/devio.c | 7 +++---- > 1 file changed, 3 insertions(+), 4 deletions(-) Should this be backported to the stable kernel trees to fix the issue on those platforms? If so, how far back? What commit caused this problem to occur? thanks, greg k-h
