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| author |   Chris Wilson <chris@chris-wilson.co.uk> | 2016-11-17 15:58:46 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2016-11-17 20:30:23 +0000 |
| commit | 6288c79ea519f6ca3a54d87974b48ca6a8b986af (patch) | |
| tree | 4d90b793f4ee66d0083520b973065e98a9783c6f /drivers/gpu/drm/i915/i915_gem_stolen.c | |
| parent | drm/i915: Waterproof verification of gen9 forcewake table ranges (diff) | |
| download | linux-dev-6288c79ea519f6ca3a54d87974b48ca6a8b986af.tar.xz linux-dev-6288c79ea519f6ca3a54d87974b48ca6a8b986af.zip | |
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>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_stolen.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_stolen.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c index 9b182ed93f3e..5bc9f699fdd2 100644 --- a/drivers/gpu/drm/i915/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c @@ -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, |