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libdrm/intel: assert that clients are using bo refcounting correctly

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Add assertions to drm_intel_gem_bo_reference,
drm_intel_gem_bo_reference_locked and drm_intel_gem_bo_unreference_locked
that the object has not been freed (refcount > 0). Mistakes in refcounting
lead to attempts to insert a bo into a free list more than once which causes
application failure as empty free lists are dereferenced as buffer objects.

Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Keith Packard 2009-05-01 18:47:04 -07:00
parent 11b60973bc
commit 68103b2758
1 changed files with 3 additions and 0 deletions
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3
libdrm/intel/intel_bufmgr_gem.c
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@ -505,6 +505,7 @@ drm_intel_gem_bo_reference(drm_intel_bo *bo)
drm_intel_bufmgr_gem *bufmgr_gem = (drm_intel_bufmgr_gem *)bo->bufmgr;
drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *)bo;
assert(bo_gem->refcount > 0);
pthread_mutex_lock(&bufmgr_gem->lock);
bo_gem->refcount++;
pthread_mutex_unlock(&bufmgr_gem->lock);
@ -515,6 +516,7 @@ drm_intel_gem_bo_reference_locked(drm_intel_bo *bo)
{
drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *)bo;
assert(bo_gem->refcount > 0);
bo_gem->refcount++;
}
@ -549,6 +551,7 @@ drm_intel_gem_bo_unreference_locked(drm_intel_bo *bo)
drm_intel_bufmgr_gem *bufmgr_gem = (drm_intel_bufmgr_gem *)bo->bufmgr;
drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *)bo;
assert(bo_gem->refcount > 0);
if (--bo_gem->refcount == 0) {
struct drm_intel_gem_bo_bucket *bucket;
uint32_t tiling_mode;