drm: Ensure universal_planes is set for atomic

Atomic doesn't really work without universal planes anyway. But make
sure that evil userspace doesn't pull the kernel over the table
because we didn't consider a cornercase that just doesn't make sense,
just for safety.

v2: Just force ->universal_planes to the same value to avoid imposing
restrictions on userspace.

Cc: Rob Clark <robdclark@gmail.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 5cb4058..3785d66 100644 (file)
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -355,6 +355,7 @@ drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
                if (req->value > 1)
                        return -EINVAL;
                file_priv->atomic = req->value;
+               file_priv->universal_planes = req->value;
                break;
        default:
                return -EINVAL;