HID: wacom: generic: Send data only when the interface is defined

Sometime valid events may not be supported by the driver yet. Make
sure we don't process them when the code is not ready.

This fix prevents a kernel panic due to unsupported HID events.
Signed-off-by: NPing Cheng <ping.cheng@wacom.com>
Reviewed-By: NJason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/hid/wacom_wac.c

@@ -2109,11 +2109,11 @@ void wacom_wac_event(struct hid_device *hdev, struct hid_field *field,
 	if (wacom->wacom_wac.features.type != HID_GENERIC)
 		return;
 
-	if (WACOM_PAD_FIELD(field))
+	if (WACOM_PAD_FIELD(field) && wacom->wacom_wac.pad_input)
 		wacom_wac_pad_event(hdev, field, usage, value);
-	else if (WACOM_PEN_FIELD(field))
+	else if (WACOM_PEN_FIELD(field) && wacom->wacom_wac.pen_input)
 		wacom_wac_pen_event(hdev, field, usage, value);
-	else if (WACOM_FINGER_FIELD(field))
+	else if (WACOM_FINGER_FIELD(field) && wacom->wacom_wac.touch_input)
 		wacom_wac_finger_event(hdev, field, usage, value);
 }
 
@@ -2145,20 +2145,20 @@ void wacom_wac_report(struct hid_device *hdev, struct hid_report *report)
 	if (wacom_wac->features.type != HID_GENERIC)
 		return;
 
-	if (WACOM_PAD_FIELD(field))
+	if (WACOM_PAD_FIELD(field) && wacom->wacom_wac.pad_input)
 		wacom_wac_pad_pre_report(hdev, report);
-	else if (WACOM_PEN_FIELD(field))
+	else if (WACOM_PEN_FIELD(field) && wacom->wacom_wac.pen_input)
 		wacom_wac_pen_pre_report(hdev, report);
-	else if (WACOM_FINGER_FIELD(field))
+	else if (WACOM_FINGER_FIELD(field) && wacom->wacom_wac.touch_input)
 		wacom_wac_finger_pre_report(hdev, report);
 
 	wacom_report_events(hdev, report);
 
-	if (WACOM_PAD_FIELD(field))
+	if (WACOM_PAD_FIELD(field) && wacom->wacom_wac.pad_input)
 		return wacom_wac_pad_report(hdev, report);
-	else if (WACOM_PEN_FIELD(field))
+	else if (WACOM_PEN_FIELD(field) && wacom->wacom_wac.pen_input)
 		return wacom_wac_pen_report(hdev, report);
-	else if (WACOM_FINGER_FIELD(field))
+	else if (WACOM_FINGER_FIELD(field) && wacom->wacom_wac.touch_input)
 		return wacom_wac_finger_report(hdev, report);
 }