diff mbox series

[RFC,02/24] drm/gpuvm: Don't require obj lock in destructor path

Message ID 20241207161651.410556-3-robdclark@gmail.com (mailing list archive)
State Not Applicable
Headers show
Series drm/msm: sparse / "VM_BIND" support | expand

Commit Message

Rob Clark Dec. 7, 2024, 4:15 p.m. UTC 
From: Rob Clark <robdclark@chromium.org>

See commit a414fe3a2129 ("drm/msm/gem: Drop obj lock in
msm_gem_free_object()") for justification.

Signed-off-by: Rob Clark <robdclark@chromium.org>
---
 drivers/gpu/drm/drm_gpuvm.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/drm_gpuvm.c b/drivers/gpu/drm/drm_gpuvm.c
index f9eb56f24bef..1e89a98caad4 100644
--- a/drivers/gpu/drm/drm_gpuvm.c
+++ b/drivers/gpu/drm/drm_gpuvm.c
@@ -1511,7 +1511,9 @@  drm_gpuvm_bo_destroy(struct kref *kref)
 	drm_gpuvm_bo_list_del(vm_bo, extobj, lock);
 	drm_gpuvm_bo_list_del(vm_bo, evict, lock);
 
-	drm_gem_gpuva_assert_lock_held(obj);
+	if (kref_read(&obj->refcount) > 0)
+		drm_gem_gpuva_assert_lock_held(obj);
+
 	list_del(&vm_bo->list.entry.gem);
 
 	if (ops && ops->vm_bo_free)
@@ -1871,7 +1873,8 @@  drm_gpuva_unlink(struct drm_gpuva *va)
 	if (unlikely(!obj))
 		return;
 
-	drm_gem_gpuva_assert_lock_held(obj);
+	if (kref_read(&obj->refcount) > 0)
+		drm_gem_gpuva_assert_lock_held(obj);
 	list_del_init(&va->gem.entry);
 
 	va->vm_bo = NULL;