Revert "drm/nouveau: remove open-coded drm_invalid_op()"

This reverts commit ccdae425.

Mandatory review was missing from this patch.
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Acked-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190807142101.251400-6-sean@poorly.run

drivers/gpu/drm/nouveau/nouveau_abi16.c

@@ -244,6 +244,12 @@ nouveau_abi16_ioctl_getparam(ABI16_IOCTL_ARGS)
 	return 0;
 }
 
+int
+nouveau_abi16_ioctl_setparam(ABI16_IOCTL_ARGS)
+{
+	return -EINVAL;
+}
+
 int
 nouveau_abi16_ioctl_channel_alloc(ABI16_IOCTL_ARGS)
 {

drivers/gpu/drm/nouveau/nouveau_abi16.h

@@ -6,6 +6,7 @@
 	struct drm_device *dev, void *data, struct drm_file *file_priv
 
 int nouveau_abi16_ioctl_getparam(ABI16_IOCTL_ARGS);
+int nouveau_abi16_ioctl_setparam(ABI16_IOCTL_ARGS);
 int nouveau_abi16_ioctl_channel_alloc(ABI16_IOCTL_ARGS);
 int nouveau_abi16_ioctl_channel_free(ABI16_IOCTL_ARGS);
 int nouveau_abi16_ioctl_grobj_alloc(ABI16_IOCTL_ARGS);

drivers/gpu/drm/nouveau/nouveau_drm.c

@@ -1047,7 +1047,7 @@ nouveau_drm_postclose(struct drm_device *dev, struct drm_file *fpriv)
 static const struct drm_ioctl_desc
 nouveau_ioctls[] = {
 	DRM_IOCTL_DEF_DRV(NOUVEAU_GETPARAM, nouveau_abi16_ioctl_getparam, DRM_RENDER_ALLOW),
-	DRM_IOCTL_DEF_DRV(NOUVEAU_SETPARAM, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+	DRM_IOCTL_DEF_DRV(NOUVEAU_SETPARAM, nouveau_abi16_ioctl_setparam, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 	DRM_IOCTL_DEF_DRV(NOUVEAU_CHANNEL_ALLOC, nouveau_abi16_ioctl_channel_alloc, DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(NOUVEAU_CHANNEL_FREE, nouveau_abi16_ioctl_channel_free, DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(NOUVEAU_GROBJ_ALLOC, nouveau_abi16_ioctl_grobj_alloc, DRM_RENDER_ALLOW),