drm/i915: don't allow tiling changes on pinned buffers v2

Makes no sense and complicates matters for pipelined tiling changes.
So don't allow it and return -EBUSY.

v2: Fix reference leak. Thanks to Owain Ainsworth for spotting this.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c
index 4bdccefcf2cf..4b7c49d4257d 100644
--- a/drivers/gpu/drm/i915/i915_gem_tiling.c
+++ b/drivers/gpu/drm/i915/i915_gem_tiling.c
@@ -283,6 +283,11 @@ i915_gem_set_tiling(struct drm_device *dev, void *data,
                 return -EINVAL;
         }
 
+        if (obj_priv->pin_count) {
+                drm_gem_object_unreference_unlocked(obj);
+                return -EBUSY;
+        }
+
         if (args->tiling_mode == I915_TILING_NONE) {
                 args->swizzle_mode = I915_BIT_6_SWIZZLE_NONE;
                 args->stride = 0;