HID: do not call hid_set_drvdata(hdev, NULL) in drivers

This is a common pattern in the HID drivers to reset the drvdata. Some
do it properly, some do it only in case of failure.

But, this is actually already handled by driver core, so there is no need
to do it manually.

[for hid-sensor-hub.c]
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
[For hid-picolcd_core.c]
Acked-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

drivers/hid/hid-cougar.c

@@ -207,7 +207,7 @@ static int cougar_probe(struct hid_device *hdev,
 	error = hid_parse(hdev);
 	if (error) {
 		hid_err(hdev, "parse failed\n");
-		goto fail;
+		return error;
 	}
 
 	if (hdev->collection->usage == COUGAR_VENDOR_USAGE) {
@@ -219,7 +219,7 @@ static int cougar_probe(struct hid_device *hdev,
 	error = hid_hw_start(hdev, connect_mask);
 	if (error) {
 		hid_err(hdev, "hw start failed\n");
-		goto fail;
+		return error;
 	}
 
 	error = cougar_bind_shared_data(hdev, cougar);
@@ -249,8 +249,6 @@ static int cougar_probe(struct hid_device *hdev,
 
 fail_stop_and_cleanup:
 	hid_hw_stop(hdev);
-fail:
-	hid_set_drvdata(hdev, NULL);
 	return error;
 }
 

drivers/hid/hid-gfrm.c

@@ -123,12 +123,6 @@ static int gfrm_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	return ret;
 }
 
-static void gfrm_remove(struct hid_device *hdev)
-{
-	hid_hw_stop(hdev);
-	hid_set_drvdata(hdev, NULL);
-}
-
 static const struct hid_device_id gfrm_devices[] = {
 	{ HID_BLUETOOTH_DEVICE(0x58, 0x2000),
 		.driver_data = GFRM100 },
@@ -142,7 +136,6 @@ static struct hid_driver gfrm_driver = {
 	.name = "gfrm",
 	.id_table = gfrm_devices,
 	.probe = gfrm_probe,
-	.remove = gfrm_remove,
 	.input_mapping = gfrm_input_mapping,
 	.raw_event = gfrm_raw_event,
 	.input_configured = gfrm_input_configured,

drivers/hid/hid-lenovo.c

@@ -866,8 +866,6 @@ static void lenovo_remove_tpkbd(struct hid_device *hdev)
 
 	led_classdev_unregister(&data_pointer->led_micmute);
 	led_classdev_unregister(&data_pointer->led_mute);
-
-	hid_set_drvdata(hdev, NULL);
 }
 
 static void lenovo_remove_cptkbd(struct hid_device *hdev)

drivers/hid/hid-picolcd_core.c

@@ -534,8 +534,7 @@ static int picolcd_probe(struct hid_device *hdev,
 	data = kzalloc(sizeof(struct picolcd_data), GFP_KERNEL);
 	if (data == NULL) {
 		hid_err(hdev, "can't allocate space for Minibox PicoLCD device data\n");
-		error = -ENOMEM;
-		goto err_no_cleanup;
+		return -ENOMEM;
 	}
 
 	spin_lock_init(&data->lock);
@@ -597,9 +596,6 @@ static int picolcd_probe(struct hid_device *hdev,
 	hid_hw_stop(hdev);
 err_cleanup_data:
 	kfree(data);
-err_no_cleanup:
-	hid_set_drvdata(hdev, NULL);
-
 	return error;
 }
 
@@ -635,7 +631,6 @@ static void picolcd_remove(struct hid_device *hdev)
 	picolcd_exit_cir(data);
 	picolcd_exit_keys(data);
 
-	hid_set_drvdata(hdev, NULL);
 	mutex_destroy(&data->mutex);
 	/* Finally, clean up the picolcd data itself */
 	kfree(data);

drivers/hid/hid-sensor-hub.c

@@ -742,7 +742,6 @@ static void sensor_hub_remove(struct hid_device *hdev)
 	}
 	spin_unlock_irqrestore(&data->lock, flags);
 	mfd_remove_devices(&hdev->dev);
-	hid_set_drvdata(hdev, NULL);
 	mutex_destroy(&data->mutex);
 }