fpga: dfl: fme: fix regression querying platform device in power_hwmo…

…n_write()

The function power_hwmon_write() receives a hwmon device created with
devm_hwmon_device_register_with_info(). Its parent device is the
platform device, i.e., dfl-fme.X device. The platform device is passed
to to_dfl_feature_dev_data(), which queries the associated platform
data to retrieve the feature device data.

The FME power management feature was available on Intel(R) Xeon(R) CPU
with Integrated FPGAs, which were capable of drawing more power than the
socket could deliver. Discrete FPGA cards do not expose this feature.

Fixes: 43adaa2 ("fpga: dfl: fix the kernel warning when release/assign ports for SRIOV")
Signed-off-by: Peter Colberg <peter.colberg@intel.com>

drivers/fpga/dfl-fme-main.c

@@ -432,7 +432,7 @@ static int power_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
 static int power_hwmon_write(struct device *dev, enum hwmon_sensor_types type,
 			     u32 attr, int channel, long val)
 {
-	struct dfl_feature_dev_data *fdata = to_dfl_feature_dev_data(dev);
+	struct dfl_feature_dev_data *fdata = to_dfl_feature_dev_data(dev->parent);
 	struct dfl_feature *feature = dev_get_drvdata(dev);
 	int ret = 0;
 	u64 v;