From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Fri, 23 Apr 2010 21:01:01 +0000 (+0200)
Subject: drm/i915: don't allow tiling changes on pinned buffers v2
X-Git-Tag: v2.6.35-rc1~451^2~12^2~2
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=31770bd49ab157c5639043ad7541c3e0c83afcc4;p=linux.git

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>
---

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;