[PATCH 1/3] RFC: drm: Restrict vblank ioctl to master

[Daniel Vetter]

Somehow this escaped us, this is a KMS ioctl which should only be used
by the master (which is the thing that's also in control of kms
resources). Everything else is bound to result in fail.

Clients shouldn't have a trouble coping with this, since a pile of
drivers don't support vblank waits (or just randomly fall over when
using them). Note that the big motivation for abusing this like mad
seems to be that EGL doesn't have OML_sync, but somehow it didn't
cross anyone's mind that adding OML_sync to EGL would be useful. This
patch is meant to essentially start kicking that can from the back
end.

Cc: fritsch at kodi.tv
Cc: fernetmenta at kodi.tv
Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
 drivers/gpu/drm/drm_ioctl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 0510675eec5d..6cc78d648393 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -529,9 +529,9 @@ static const struct drm_ioctl_desc drm_ioctls[] = {
 	DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 	DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 
-	DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
+	DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_MASTER|DRM_UNLOCKED),
 
-	DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
+	DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, DRM_MASTER),
 
 	DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
 
-- 
2.8.1