drm/i915: disallow gem ums init ioctl for kms

This ioctl used in a kms driver is only useful to create massive
havoc.

v2: Bail out with -ENODEV as suggested by Chris Wilson.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index b402d70dc78b..1b808d041949 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -140,6 +140,9 @@ i915_gem_init_ioctl(struct drm_device *dev, void *data,
 {
         struct drm_i915_gem_init *args = data;
 
+        if (drm_core_check_feature(dev, DRIVER_MODESET))
+                return -ENODEV;
+
         if (args->gtt_start >= args->gtt_end ||
             (args->gtt_end | args->gtt_start) & (PAGE_SIZE - 1))
                 return -EINVAL;