On Friday, January 13th, 2023 at 17:59, Maíra Canal <mcanal@xxxxxxxxxx> wrote:
> + /* Verify that the modifier is supported. */
> + if (r->modifier[0] && drm_drv_uses_atomic_modeset(dev) &&
> + !drm_any_plane_has_format(dev, r->pixel_format, r->modifier[0])) {
> + drm_dbg_kms(dev, "Unsupported pixel format %p4cc / modifier 0x%llx\n",
> + &r->pixel_format, r->modifier[0]);
> + return -EINVAL;
> + }
User-space indicates whether there is a modifier in the IOCTL data by supplying
the DRM_MODE_FB_MODIFIERS flag. I believe we need to check that flag instead of
r->modifier[0]: the zero modifier is a valid modifier (LINEAR).
