drm/mediatek: Add missing IS_ERR check for ovl_adaptor platform devicegrafted

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 <lihaojie@kylinos.cn>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20260825100845.438893-1-lihaojie@kylinos.cn/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

1 files changed, 33 insertions, 0 deletions

diff --git a/Documentation/admin-guide/perf/index.rst b/Documentation/admin-guide/perf/index.rst
new file mode 100644
index 000000000..aa12708dd
--- /dev/null
+++ b/Documentation/admin-guide/perf/index.rst
@@ -0,0 +1,33 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===========================
+Performance monitor support
+===========================
+
+.. toctree::
+   :maxdepth: 1
+
+   hisi-pmu
+   hisi-pcie-pmu
+   hns3-pmu
+   imx-ddr
+   qcom_l2_pmu
+   qcom_l3_pmu
+   starfive_starlink_pmu
+   mrvl-odyssey-ddr-pmu
+   mrvl-odyssey-tad-pmu
+   arm-ccn
+   arm-cmn
+   arm-ni
+   xgene-pmu
+   arm_dsu_pmu
+   thunderx2-pmu
+   alibaba_pmu
+   dwc_pcie_pmu
+   nvidia-tegra241-pmu
+   nvidia-tegra410-pmu
+   meson-ddr-pmu
+   cxl
+   ampere_cspmu
+   mrvl-pem-pmu
+   fujitsu_uncore_pmu