From bce7698e2e6565bb765bd0522337f29f5f312624 Mon Sep 17 00:00:00 2001 From: Haojie Li Date: Tue, 25 Aug 2026 18:08:45 +0800 Subject: drm/mediatek: Add missing IS_ERR check for ovl_adaptor platform device platform_device_register_data() can fail and return an ERR_PTR, but the return value is used without checking, leading to an invalid pointer being stored in ddp_comp[].dev and passed to component_match_add() and mtk_ddp_comp_init(), which could result in a kernel crash. Add an IS_ERR() check to jump to the error handling path on failure. Fixes: 0d9eee9118b7 ("drm/mediatek: Add drm ovl_adaptor sub driver for MT8195") Cc: stable@vger.kernel.org Signed-off-by: Haojie Li Reviewed-by: CK Hu Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20260825100845.438893-1-lihaojie@kylinos.cn/ Signed-off-by: Chun-Kuang Hu --- Documentation/driver-api/auxiliary_bus.rst | 49 ++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 Documentation/driver-api/auxiliary_bus.rst (limited to 'Documentation/driver-api/auxiliary_bus.rst') diff --git a/Documentation/driver-api/auxiliary_bus.rst b/Documentation/driver-api/auxiliary_bus.rst new file mode 100644 index 000000000..b236de773 --- /dev/null +++ b/Documentation/driver-api/auxiliary_bus.rst @@ -0,0 +1,49 @@ +.. SPDX-License-Identifier: GPL-2.0-only + +.. _auxiliary_bus: + +============= +Auxiliary Bus +============= + +.. kernel-doc:: drivers/base/auxiliary.c + :doc: PURPOSE + +When Should the Auxiliary Bus Be Used +===================================== + +.. kernel-doc:: drivers/base/auxiliary.c + :doc: USAGE + + +Auxiliary Device Creation +========================= + +.. kernel-doc:: include/linux/auxiliary_bus.h + :identifiers: auxiliary_device + +.. kernel-doc:: drivers/base/auxiliary.c + :identifiers: auxiliary_device_init __auxiliary_device_add + +Auxiliary Device Memory Model and Lifespan +------------------------------------------ + +.. kernel-doc:: include/linux/auxiliary_bus.h + :doc: DEVICE_LIFESPAN + + +Auxiliary Drivers +================= + +.. kernel-doc:: include/linux/auxiliary_bus.h + :identifiers: auxiliary_driver module_auxiliary_driver + +.. kernel-doc:: drivers/base/auxiliary.c + :identifiers: __auxiliary_driver_register auxiliary_driver_unregister + +Example Usage +============= + +.. kernel-doc:: drivers/base/auxiliary.c + :doc: EXAMPLE + -- cgit v1.3.1