Input: synaptics - do not try to process packets from slave device

       as if they were coming form the touchpad itself if pass-through
       port is disconnected, just pass them to serio core and it will
       attempt to bind proper driver to the port
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/mouse/synaptics.c

@@ -233,17 +233,14 @@ static void synaptics_pass_pt_packet(struct serio *ptport, unsigned char *packet
 {
 	struct psmouse *child = ptport->private;
 
-	if (child) {
-		if (child->state == PSMOUSE_ACTIVATED) {
+	if (child && child->state == PSMOUSE_ACTIVATED) {
 		serio_interrupt(ptport, packet[1], 0, NULL);
 		serio_interrupt(ptport, packet[4], 0, NULL);
 		serio_interrupt(ptport, packet[5], 0, NULL);
 		if (child->type >= PSMOUSE_GENPS)
 			serio_interrupt(ptport, packet[2], 0, NULL);
-		} else if (child->state != PSMOUSE_IGNORE) {
+	} else
 		serio_interrupt(ptport, packet[1], 0, NULL);
-		}
-	}
 }
 
 static void synaptics_pt_activate(struct psmouse *psmouse)
@@ -472,9 +469,10 @@ static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse, struct pt_r
 		if (unlikely(priv->pkt_type == SYN_NEWABS))
 			priv->pkt_type = synaptics_detect_pkt_type(psmouse);
 
-		if (psmouse->serio->child && psmouse->serio->child->drv && synaptics_is_pt_packet(psmouse->packet))
+		if (SYN_CAP_PASS_THROUGH(priv->capabilities) && synaptics_is_pt_packet(psmouse->packet)) {
+			if (psmouse->serio->child)
 				synaptics_pass_pt_packet(psmouse->serio->child, psmouse->packet);
-		else
+		} else
 			synaptics_process_packet(psmouse);
 
 		return PSMOUSE_FULL_PACKET;