On Thu, Nov 11, 2021 at 10:10:54AM +0000, Simon Ser wrote:
> User-space shouldn't look up the modifier array when the modifier
> flag is missing, but at the moment no docs make this clear (working
> on it). Right now the modifier array is pre-filled with zeroes, aka.
> LINEAR. Instead, pre-fill with INVALID to avoid footguns.
>
> This is a uAPI change, but OTOH any user-space which looks up the
> modifier array without checking the flag is broken already, so
> should be fine.
>
> Signed-off-by: Simon Ser <contact@xxxxxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: Pekka Paalanen <ppaalanen@xxxxxxxxx>
> Cc: Daniel Stone <daniels@xxxxxxxxxxxxx>
Isn't this going to break the test where we pass the get
getfb2 result back into addfb2?
> ---
> drivers/gpu/drm/drm_framebuffer.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
> index 07f5abc875e9..f7041c0a0407 100644
> --- a/drivers/gpu/drm/drm_framebuffer.c
> +++ b/drivers/gpu/drm/drm_framebuffer.c
> @@ -601,7 +601,7 @@ int drm_mode_getfb2_ioctl(struct drm_device *dev,
> r->handles[i] = 0;
> r->pitches[i] = 0;
> r->offsets[i] = 0;
> - r->modifier[i] = 0;
> + r->modifier[i] = DRM_FORMAT_MOD_INVALID;
> }
>
> for (i = 0; i < fb->format->num_planes; i++) {
> --
> 2.33.1
>
--
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