Greg and other stable maintainers please ignore this one.
Tom just misunderstood, what to do with this patch.
Thanks,
Christian.
Am 29.01.2018 um 15:34 schrieb Tom St Denis:
> The buf pointer was not being incremented inside the loop
> meaning the same block of data would be read or written
> repeatedly.
>
> Fixes: 09ac4fcb3f25 ("drm/ttm: Implement vm_operations_struct.access v2")
>
> Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
> Reviewed-by: Christian König <christian.koenig at amd.com>
>
> (v2) Change 'buf' pointer to uint8_t* type
> ---
> drivers/gpu/drm/ttm/ttm_bo_vm.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
> index 08a3c324242e..60fcef1593dd 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
> @@ -316,7 +316,7 @@ static void ttm_bo_vm_close(struct vm_area_struct *vma)
>
> static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo,
> unsigned long offset,
> - void *buf, int len, int write)
> + uint8_t *buf, int len, int write)
> {
> unsigned long page = offset >> PAGE_SHIFT;
> unsigned long bytes_left = len;
> @@ -345,6 +345,7 @@ static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo,
> ttm_bo_kunmap(&map);
>
> page++;
> + buf += bytes;
> bytes_left -= bytes;
> offset = 0;
> } while (bytes_left);
