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drm/i915: Add a few more sanity checks for stolen handling 

We should never be called via obj->ops->release() on anything other than
a fully formed stolen object, so raise that to an assert. In the process
tidy up a comment and variable no longer used outside of a conditional
BUG.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20161117155846.4631-1-chris@chris-wilson.co.uk
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
This commit is contained in:
Chris Wilson 2016-11-17 15:58:46 +00:00
parent a194b8cb84
commit 6288c79ea5
1 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/gpu/drm/i915/i915_gem_stolen.c
View File

@ -513,11 +513,10 @@ i915_pages_create_for_stolen(struct drm_device *dev,
u32 offset, u32 size)
{
struct drm_i915_private *dev_priv = to_i915(dev);
struct i915_ggtt *ggtt = &dev_priv->ggtt;
struct sg_table *st;
struct scatterlist *sg;
GEM_BUG_ON(offset > ggtt->stolen_size - size);
GEM_BUG_ON(offset > dev_priv->ggtt.stolen_size - size);
/* We hide that we have no struct page backing our stolen object
* by wrapping the contiguous physical allocation with a fake
@ -554,7 +553,7 @@ i915_gem_object_get_pages_stolen(struct drm_i915_gem_object *obj)
static void i915_gem_object_put_pages_stolen(struct drm_i915_gem_object *obj,
struct sg_table *pages)
{
/* Should only be called during free */
/* Should only be called from i915_gem_object_release_stolen() */
sg_free_table(pages);
kfree(pages);
}
@ -563,15 +562,16 @@ static void
i915_gem_object_release_stolen(struct drm_i915_gem_object *obj)
{
struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
struct drm_mm_node *stolen = fetch_and_zero(&obj->stolen);
GEM_BUG_ON(!stolen);
__i915_gem_object_unpin_pages(obj);
if (obj->stolen) {
i915_gem_stolen_remove_node(dev_priv, obj->stolen);
kfree(obj->stolen);
obj->stolen = NULL;
}
i915_gem_stolen_remove_node(dev_priv, stolen);
kfree(stolen);
}
static const struct drm_i915_gem_object_ops i915_gem_object_stolen_ops = {
.get_pages = i915_gem_object_get_pages_stolen,
.put_pages = i915_gem_object_put_pages_stolen,