Re: [PATCH v2] drm/gem-shmem: When drm_gem_object_init failed, should release object

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Hi

Am 11.11.22 um 04:38 schrieb ChunyouTang:
when goto err_free, the object had init, so it should be release when fail.

Signed-off-by: ChunyouTang <tangchunyou@xxxxxxx>
---
  drivers/gpu/drm/drm_gem.c              | 19 ++++++++++++++++---
  drivers/gpu/drm/drm_gem_shmem_helper.c |  4 +++-
  include/drm/drm_gem.h                  |  1 +
  3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 8b68a3c1e6ab..cba32c46bb05 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -169,6 +169,21 @@ void drm_gem_private_object_init(struct drm_device *dev,
  }
  EXPORT_SYMBOL(drm_gem_private_object_init);
+/**
+ * drm_gem_private_object_fini - Finalize a failed drm_gem_object
+ * @obj: drm_gem_object
+ *
+ * Uninitialize an already allocated GEM object when it initialized failed
+ */
+void drm_gem_private_object_fini(struct drm_gem_object *obj)
+{
+	WARN_ON(obj->dma_buf);

Rather lease this in its original place.

+
+	dma_resv_fini(&obj->_resv);
+	drm_gem_lru_remove(obj);

AFAICT drm_gem_lru_remove() doesn't belong into this function.

+}
+EXPORT_SYMBOL(drm_gem_private_object_fini);
+
  /**
   * drm_gem_object_handle_free - release resources bound to userspace handles
   * @obj: GEM object to clean up.
@@ -930,14 +945,12 @@ drm_gem_release(struct drm_device *dev, struct drm_file *file_private)
  void
  drm_gem_object_release(struct drm_gem_object *obj)
  {
-	WARN_ON(obj->dma_buf);
+	drm_gem_private_object_fini(obj);
if (obj->filp)
  		fput(obj->filp);
- dma_resv_fini(&obj->_resv);

Please call drm_gem_private_object_fini() here.

  	drm_gem_free_mmap_offset(obj);
-	drm_gem_lru_remove(obj);

Please keep this line here.

Best regards
Thomas

  }
  EXPORT_SYMBOL(drm_gem_object_release);
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 35138f8a375c..845e3d5d71eb 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -79,8 +79,10 @@ __drm_gem_shmem_create(struct drm_device *dev, size_t size, bool private)
  	} else {
  		ret = drm_gem_object_init(dev, obj, size);
  	}
-	if (ret)
+	if (ret) {
+		drm_gem_private_object_fini(obj)
  		goto err_free;
+	}
ret = drm_gem_create_mmap_offset(obj);
  	if (ret)
diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index bd42f25e449c..9b1feb03069d 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -405,6 +405,7 @@ int drm_gem_object_init(struct drm_device *dev,
  			struct drm_gem_object *obj, size_t size);
  void drm_gem_private_object_init(struct drm_device *dev,
  				 struct drm_gem_object *obj, size_t size);
+void drm_gem_private_object_fini(struct drm_gem_object *obj);
  void drm_gem_vm_open(struct vm_area_struct *vma);
  void drm_gem_vm_close(struct vm_area_struct *vma);
  int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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