From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Tue, 22 Sep 2009 17:46:17 +0000 (+0100)
Subject: drm/i915: Warn before mmaping a purgeable buffer.
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=ab18282d58ce67ee5cd720d99a91c1a2bbf3e693;p=deliverable%2Flinux.git

drm/i915: Warn before mmaping a purgeable buffer.

Only allow the user to mmap buffers that have not been marked as
purgeable.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index f4f714e39b7b..4755ba41bfef 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1431,6 +1431,14 @@ i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
 
 	obj_priv = obj->driver_private;
 
+	if (obj_priv->madv != I915_MADV_WILLNEED) {
+		DRM_ERROR("Attempting to mmap a purgeable buffer\n");
+		drm_gem_object_unreference(obj);
+		mutex_unlock(&dev->struct_mutex);
+		return -EINVAL;
+	}
+
+
 	if (!obj_priv->mmap_offset) {
 		ret = i915_gem_create_mmap_offset(obj);
 		if (ret) {