This is a note to let you know that I've just added the patch titled

drm/gem: Internally test import_attach for imported objects

to the 6.12-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: drm-gem-internally-test-import_attach-for-imported-objects.patch and it can be found in the queue-6.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 8260731ccad0451207b45844bb66eb161a209218 Mon Sep 17 00:00:00 2001 From: Thomas Zimmermann tzimmermann@suse.de Date: Wed, 16 Apr 2025 08:57:45 +0200 Subject: drm/gem: Internally test import_attach for imported objects MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

From: Thomas Zimmermann tzimmermann@suse.de

commit 8260731ccad0451207b45844bb66eb161a209218 upstream.

Test struct drm_gem_object.import_attach to detect imported objects.

During object clenanup, the dma_buf field might be NULL. Testing it in an object's free callback then incorrectly does a cleanup as for native objects. Happens for calls to drm_mode_destroy_dumb_ioctl() that clears the dma_buf field in drm_gem_object_exported_dma_buf_free().

v3: - only test for import_attach (Boris) v2: - use import_attach.dmabuf instead of dma_buf (Christian)

Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Fixes: b57aa47d39e9 ("drm/gem: Test for imported GEM buffers with helper") Reported-by: Andy Yan andyshrk@163.com Closes: https://lore.kernel.org/dri-devel/38d09d34.4354.196379aa560.Coremail.andyshr... Tested-by: Andy Yan andyshrk@163.com Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Anusha Srivatsa asrivats@redhat.com Cc: Christian König christian.koenig@amd.com Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Maxime Ripard mripard@kernel.org Cc: David Airlie airlied@gmail.com Cc: Simona Vetter simona@ffwll.ch Cc: Sumit Semwal sumit.semwal@linaro.org Cc: "Christian König" christian.koenig@amd.com Cc: dri-devel@lists.freedesktop.org Cc: linux-media@vger.kernel.org Cc: linaro-mm-sig@lists.linaro.org Reviewed-by: Boris Brezillon boris.brezillon@collabora.com Reviewed-by: Simona Vetter simona.vetter@ffwll.ch Link: https://lore.kernel.org/r/20250416065820.26076-1-tzimmermann@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/drm/drm_gem.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/include/drm/drm_gem.h +++ b/include/drm/drm_gem.h @@ -580,8 +580,7 @@ static inline bool drm_gem_object_is_sha */ static inline bool drm_gem_is_imported(const struct drm_gem_object *obj) { - /* The dma-buf's priv field points to the original GEM object. */ - return obj->dma_buf && (obj->dma_buf->priv != obj); + return !!obj->import_attach; }

#ifdef CONFIG_LOCKDEP

Patches currently in stable-queue which might be from tzimmermann@suse.de are

queue-6.12/drm-gem-internally-test-import_attach-for-imported-objects.patch queue-6.12/drm-ast-find-vbios-mode-from-regular-display-size.patch queue-6.12/drm-gem-test-for-imported-gem-buffers-with-helper.patch queue-6.12/drm-atomic-clarify-the-rules-around-drm_atomic_state.patch