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, 80 insertions, 0 deletions

diff --git a/Documentation/hwmon/tmp401.rst b/Documentation/hwmon/tmp401.rst
new file mode 100644
index 000000000..3aacf3d3b
--- /dev/null
+++ b/Documentation/hwmon/tmp401.rst
@@ -0,0 +1,80 @@
+Kernel driver tmp401
+====================
+
+Supported chips:
+
+  * Texas Instruments TMP401
+
+    Prefix: 'tmp401'
+
+    Addresses scanned: I2C 0x4c
+
+    Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp401.html
+
+  * Texas Instruments TMP411
+
+    Prefix: 'tmp411'
+
+    Addresses scanned: I2C 0x4c, 0x4d, 0x4e
+
+    Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp411.html
+
+  * Texas Instruments TMP431
+
+    Prefix: 'tmp431'
+
+    Addresses scanned: I2C 0x4c, 0x4d
+
+    Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp431.html
+
+  * Texas Instruments TMP432
+
+    Prefix: 'tmp432'
+
+    Addresses scanned: I2C 0x4c, 0x4d
+
+    Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp432.html
+
+  * Texas Instruments TMP435
+
+    Prefix: 'tmp435'
+
+    Addresses scanned: I2C 0x48 - 0x4f
+
+    Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp435.html
+
+
+
+Authors:
+
+	- Hans de Goede <hdegoede@redhat.com>
+	- Andre Prendel <andre.prendel@gmx.de>
+
+Description
+-----------
+
+This driver implements support for Texas Instruments TMP401, TMP411,
+TMP431, TMP432, and TMP435 chips. These chips implement one or two
+remote and one local temperature sensors. Temperature is measured in degrees
+Celsius. Resolution of the remote sensor is 0.0625 degree. Local
+sensor resolution can be set to 0.5, 0.25, 0.125 or 0.0625 degree (not
+supported by the driver so far, so using the default resolution of 0.5
+degree).
+
+The driver provides the common sysfs-interface for temperatures (see
+Documentation/hwmon/sysfs-interface.rst under Temperatures).
+
+The TMP411 and TMP431 chips are compatible with TMP401. TMP411 provides
+some additional features.
+
+* Minimum and Maximum temperature measured since power-on, chip-reset
+
+  Exported via sysfs attributes tempX_lowest and tempX_highest.
+
+* Reset of historical minimum/maximum temperature measurements
+
+  Exported via sysfs attribute temp_reset_history. Writing 1 to this
+  file triggers a reset.
+
+TMP432 is compatible with TMP401 and TMP431. It supports two external
+temperature sensors.