| Message ID | 20191204164527.3872783-1-chris@chris-wilson.co.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/i915/gem: Hold the obj->vma.lock while walking the vma.list | expand |
On Wed, 4 Dec 2019 at 16:45, Chris Wilson <chris@chris-wilson.co.uk> wrote: > > Remember to take the lock before walking the obj->vma.list so that the > nodes do not change beneath us! E.g., > > i915_gem_object_bump_inactive_ggtt: i915_gem_object_bump_inactive_ggtt:387 GEM_BUG_ON(vma->vm != &i915->ggtt.vm) > > Closes: https://gitlab.freedesktop.org/drm/intel/issues/691 > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> > Cc: Matthew Auld <matthew.auld@intel.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com>
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_domain.c b/drivers/gpu/drm/i915/gem/i915_gem_domain.c index f2064950622b..808eb327a29b 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_domain.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_domain.c @@ -379,8 +379,11 @@ static void i915_gem_object_bump_inactive_ggtt(struct drm_i915_gem_object *obj) struct i915_vma *vma; GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj)); + if (!atomic_read(&obj->bind_count)) + return; mutex_lock(&i915->ggtt.vm.mutex); + spin_lock(&obj->vma.lock); for_each_ggtt_vma(vma, obj) { if (!drm_mm_node_allocated(&vma->node)) continue; @@ -388,6 +391,7 @@ static void i915_gem_object_bump_inactive_ggtt(struct drm_i915_gem_object *obj) GEM_BUG_ON(vma->vm != &i915->ggtt.vm); list_move_tail(&vma->vm_link, &vma->vm->bound_list); } + spin_unlock(&obj->vma.lock); mutex_unlock(&i915->ggtt.vm.mutex); if (i915_gem_object_is_shrinkable(obj)) {
Remember to take the lock before walking the obj->vma.list so that the nodes do not change beneath us! E.g., i915_gem_object_bump_inactive_ggtt: i915_gem_object_bump_inactive_ggtt:387 GEM_BUG_ON(vma->vm != &i915->ggtt.vm) Closes: https://gitlab.freedesktop.org/drm/intel/issues/691 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.auld@intel.com> --- drivers/gpu/drm/i915/gem/i915_gem_domain.c | 4 ++++ 1 file changed, 4 insertions(+)