iio: hid-sensors: bind IIO channels alloc to device object

Some HID drivers use devm_kmemdup() already to clone the template IIO
channels information and update it.
However, there are still some drivers that kmemdup() and kfree() the
channels.

This change converts them to use devm_kmemdup() and bind the life-time of
this allocated object to the parent device object (in these drivers).

Signed-off-by: Alexandru Ardelean <[e-mail]>
Acked-by: Srinivas Pandruvada <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/accel/hid-sensor-accel-3d.c

···
 		dev_err(&pdev->dev, "failed to setup common attributes\n");
 		return ret;
 	}
-	indio_dev->channels = kmemdup(channel_spec, channel_size, GFP_KERNEL);
+	indio_dev->channels = devm_kmemdup(&pdev->dev, channel_spec,
+					   channel_size, GFP_KERNEL);
 
 	if (!indio_dev->channels) {
 		dev_err(&pdev->dev, "failed to duplicate channels\n");
···
 				hsdev->usage, accel_state);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to setup attributes\n");
-		goto error_free_dev_mem;
+		return ret;
 	}
 
 	indio_dev->info = &accel_3d_info;
···
 					&accel_state->common_attributes);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "trigger setup failed\n");
-		goto error_free_dev_mem;
+		return ret;
 	}
 
 	ret = iio_device_register(indio_dev);
···
 	iio_device_unregister(indio_dev);
 error_remove_trigger:
 	hid_sensor_remove_trigger(indio_dev, &accel_state->common_attributes);
-error_free_dev_mem:
-	kfree(indio_dev->channels);
 	return ret;
 }
 
···
 	sensor_hub_remove_callback(hsdev, hsdev->usage);
 	iio_device_unregister(indio_dev);
 	hid_sensor_remove_trigger(indio_dev, &accel_state->common_attributes);
-	kfree(indio_dev->channels);
 
 	return 0;
 }

drivers/iio/gyro/hid-sensor-gyro-3d.c

···
 		return ret;
 	}
 
-	indio_dev->channels = kmemdup(gyro_3d_channels,
-				      sizeof(gyro_3d_channels), GFP_KERNEL);
+	indio_dev->channels = devm_kmemdup(&pdev->dev, gyro_3d_channels,
+					   sizeof(gyro_3d_channels), GFP_KERNEL);
 	if (!indio_dev->channels) {
 		dev_err(&pdev->dev, "failed to duplicate channels\n");
 		return -ENOMEM;
···
 				   HID_USAGE_SENSOR_GYRO_3D, gyro_state);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to setup attributes\n");
-		goto error_free_dev_mem;
+		return ret;
 	}
 
 	indio_dev->num_channels = ARRAY_SIZE(gyro_3d_channels);
···
 					&gyro_state->common_attributes);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "trigger setup failed\n");
-		goto error_free_dev_mem;
+		return ret;
 	}
 
 	ret = iio_device_register(indio_dev);
···
 	iio_device_unregister(indio_dev);
 error_remove_trigger:
 	hid_sensor_remove_trigger(indio_dev, &gyro_state->common_attributes);
-error_free_dev_mem:
-	kfree(indio_dev->channels);
 	return ret;
 }
 
···
 	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_GYRO_3D);
 	iio_device_unregister(indio_dev);
 	hid_sensor_remove_trigger(indio_dev, &gyro_state->common_attributes);
-	kfree(indio_dev->channels);
 
 	return 0;
 }

drivers/iio/light/hid-sensor-als.c

···
 		return ret;
 	}
 
-	indio_dev->channels = kmemdup(als_channels,
-				      sizeof(als_channels), GFP_KERNEL);
+	indio_dev->channels = devm_kmemdup(&pdev->dev, als_channels,
+					   sizeof(als_channels), GFP_KERNEL);
 	if (!indio_dev->channels) {
 		dev_err(&pdev->dev, "failed to duplicate channels\n");
 		return -ENOMEM;
···
 			       HID_USAGE_SENSOR_ALS, als_state);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to setup attributes\n");
-		goto error_free_dev_mem;
+		return ret;
 	}
 
 	indio_dev->num_channels =
···
 				&als_state->common_attributes);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "trigger setup failed\n");
-		goto error_free_dev_mem;
+		return ret;
 	}
 
 	ret = iio_device_register(indio_dev);
···
 	iio_device_unregister(indio_dev);
 error_remove_trigger:
 	hid_sensor_remove_trigger(indio_dev, &als_state->common_attributes);
-error_free_dev_mem:
-	kfree(indio_dev->channels);
 	return ret;
 }
 
···
 	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS);
 	iio_device_unregister(indio_dev);
 	hid_sensor_remove_trigger(indio_dev, &als_state->common_attributes);
-	kfree(indio_dev->channels);
 
 	return 0;
 }

drivers/iio/light/hid-sensor-prox.c

···
 		return ret;
 	}
 
-	indio_dev->channels = kmemdup(prox_channels, sizeof(prox_channels),
-				      GFP_KERNEL);
+	indio_dev->channels = devm_kmemdup(&pdev->dev, prox_channels,
+					   sizeof(prox_channels), GFP_KERNEL);
 	if (!indio_dev->channels) {
 		dev_err(&pdev->dev, "failed to duplicate channels\n");
 		return -ENOMEM;
···
 				HID_USAGE_SENSOR_PROX, prox_state);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to setup attributes\n");
-		goto error_free_dev_mem;
+		return ret;
 	}
 
 	indio_dev->num_channels = ARRAY_SIZE(prox_channels);
···
 				&prox_state->common_attributes);
 	if (ret) {
 		dev_err(&pdev->dev, "trigger setup failed\n");
-		goto error_free_dev_mem;
+		return ret;
 	}
 
 	ret = iio_device_register(indio_dev);
···
 	iio_device_unregister(indio_dev);
 error_remove_trigger:
 	hid_sensor_remove_trigger(indio_dev, &prox_state->common_attributes);
-error_free_dev_mem:
-	kfree(indio_dev->channels);
 	return ret;
 }
 
···
 	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PROX);
 	iio_device_unregister(indio_dev);
 	hid_sensor_remove_trigger(indio_dev, &prox_state->common_attributes);
-	kfree(indio_dev->channels);
 
 	return 0;
 }

drivers/iio/orientation/hid-sensor-incl-3d.c

···
 		return ret;
 	}
 
-	indio_dev->channels = kmemdup(incl_3d_channels,
-				      sizeof(incl_3d_channels), GFP_KERNEL);
+	indio_dev->channels = devm_kmemdup(&pdev->dev, incl_3d_channels,
+					   sizeof(incl_3d_channels), GFP_KERNEL);
 	if (!indio_dev->channels) {
 		dev_err(&pdev->dev, "failed to duplicate channels\n");
 		return -ENOMEM;
···
 				   incl_state);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to setup attributes\n");
-		goto error_free_dev_mem;
+		return ret;
 	}
 
 	indio_dev->num_channels = ARRAY_SIZE(incl_3d_channels);
···
 					&incl_state->common_attributes);
 	if (ret) {
 		dev_err(&pdev->dev, "trigger setup failed\n");
-		goto error_free_dev_mem;
+		return ret;
 	}
 
 	ret = iio_device_register(indio_dev);
···
 	iio_device_unregister(indio_dev);
 error_remove_trigger:
 	hid_sensor_remove_trigger(indio_dev, &incl_state->common_attributes);
-error_free_dev_mem:
-	kfree(indio_dev->channels);
 	return ret;
 }
 
···
 	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_INCLINOMETER_3D);
 	iio_device_unregister(indio_dev);
 	hid_sensor_remove_trigger(indio_dev, &incl_state->common_attributes);
-	kfree(indio_dev->channels);
 
 	return 0;
 }

drivers/iio/pressure/hid-sensor-press.c

···
 		return ret;
 	}
 
-	indio_dev->channels = kmemdup(press_channels, sizeof(press_channels),
-				      GFP_KERNEL);
+	indio_dev->channels = devm_kmemdup(&pdev->dev, press_channels,
+					   sizeof(press_channels), GFP_KERNEL);
 	if (!indio_dev->channels) {
 		dev_err(&pdev->dev, "failed to duplicate channels\n");
 		return -ENOMEM;
···
 				 HID_USAGE_SENSOR_PRESSURE, press_state);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to setup attributes\n");
-		goto error_free_dev_mem;
+		return ret;
 	}
 
 	indio_dev->num_channels =
···
 				&press_state->common_attributes);
 	if (ret) {
 		dev_err(&pdev->dev, "trigger setup failed\n");
-		goto error_free_dev_mem;
+		return ret;
 	}
 
 	ret = iio_device_register(indio_dev);
···
 	iio_device_unregister(indio_dev);
 error_remove_trigger:
 	hid_sensor_remove_trigger(indio_dev, &press_state->common_attributes);
-error_free_dev_mem:
-	kfree(indio_dev->channels);
 	return ret;
 }
 
···
 	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PRESSURE);
 	iio_device_unregister(indio_dev);
 	hid_sensor_remove_trigger(indio_dev, &press_state->common_attributes);
-	kfree(indio_dev->channels);
 
 	return 0;
 }