drm/vc4: Validate that WAIT_BO padding is cleared.

This is ABI future-proofing if we ever want to extend the pad to mean
something.

Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c
index 48ce30a6f4b5cebb21348c1148d85a8c2450e45f..cc89ffcfc6aabe2e7ec92be6e9e65adfcad378f6 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_gem.c
+++ b/drivers/gpu/drm/vc4/vc4_gem.c
@@ -746,6 +746,9 @@ vc4_wait_bo_ioctl(struct drm_device *dev, void *data,
        struct drm_gem_object *gem_obj;
        struct vc4_bo *bo;
 
+       if (args->pad != 0)
+               return -EINVAL;
+
        gem_obj = drm_gem_object_lookup(dev, file_priv, args->handle);
        if (!gem_obj) {
                DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);