From ab18282d58ce67ee5cd720d99a91c1a2bbf3e693 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Tue, 22 Sep 2009 18:46:17 +0100
Subject: [PATCH] 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>
---
drivers/gpu/drm/i915/i915_gem.c | 8 ++++++++
1 file changed, 8 insertions(+)
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) {
--
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