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, 29 insertions, 0 deletions

diff --git a/Documentation/power/tricks.rst b/Documentation/power/tricks.rst
new file mode 100644
index 000000000..ca787f142
--- /dev/null
+++ b/Documentation/power/tricks.rst
@@ -0,0 +1,29 @@
+================
+swsusp/S3 tricks
+================
+
+Pavel Machek <pavel@ucw.cz>
+
+If you want to trick swsusp/S3 into working, you might want to try:
+
+* go with minimal config, turn off drivers like USB, AGP you don't
+  really need
+
+* turn off APIC and preempt
+
+* use ext2. At least it has working fsck. [If something seems to go
+  wrong, force fsck when you have a chance]
+
+* turn off modules
+
+* use vga text console, shut down X. [If you really want X, you might
+  want to try vesafb later]
+
+* try running as few processes as possible, preferably go to single
+  user mode.
+
+* due to video issues, swsusp should be easier to get working than
+  S3. Try that first.
+
+When you make it work, try to find out what exactly was it that broke
+suspend, and preferably fix that.