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hwmon: fix potential sensor registration fail if of_node is missing 

[ Upstream commit 2315332efc ]

It is not sufficient to check of_node in current device.
In some cases, this would cause the sensor registration to fail.

This patch looks for device's ancestors to find a valid of_node if any.

Fixes: d560168b5d ("hwmon: (core) New hwmon registration API")
Signed-off-by: Phinex Hung <phinex@realtek.com>
Link: https://lore.kernel.org/r/20230321060224.3819-1-phinex@realtek.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Phinex Hung 2023-03-21 14:02:23 +08:00 committed by Greg Kroah-Hartman
parent d716ea059c
commit f326376896
1 changed files with 5 additions and 2 deletions
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7
drivers/hwmon/hwmon.c
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@ -756,6 +756,7 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
struct hwmon_device *hwdev;
const char *label;
struct device *hdev;
struct device *tdev = dev;
int i, err, id;
/* Complain about invalid characters in hwmon name attribute */
@ -825,7 +826,9 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
hwdev->name = name;
hdev->class = &hwmon_class;
hdev->parent = dev;
hdev->of_node = dev ? dev->of_node : NULL;
while (tdev && !tdev->of_node)
tdev = tdev->parent;
hdev->of_node = tdev ? tdev->of_node : NULL;
hwdev->chip = chip;
dev_set_drvdata(hdev, drvdata);
dev_set_name(hdev, HWMON_ID_FORMAT, id);
@ -837,7 +840,7 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
INIT_LIST_HEAD(&hwdev->tzdata);
if (dev && dev->of_node && chip && chip->ops->read &&
if (hdev->of_node && chip && chip->ops->read &&
chip->info[0]->type == hwmon_chip &&
(chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
err = hwmon_thermal_register_sensors(hdev);