thunderbolt: Fix path indices used in USB3 tunnel discovery

The USB3 discovery used wrong indices when tunnel is discovered. It
should use TB_USB3_PATH_DOWN for path that flows downstream and
TB_USB3_PATH_UP when it flows upstream. This should not affect the
functionality but better to fix it.

Fixes: e6f81858 ("thunderbolt: Add support for USB 3.x tunnels")
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: stable@vger.kernel.org # v5.6+

drivers/thunderbolt/tunnel.c

@@ -913,21 +913,21 @@ struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down)
 	 * case.
 	 */
 	path = tb_path_discover(down, TB_USB3_HOPID, NULL, -1,
-				&tunnel->dst_port, "USB3 Up");
+				&tunnel->dst_port, "USB3 Down");
 	if (!path) {
 		/* Just disable the downstream port */
 		tb_usb3_port_enable(down, false);
 		goto err_free;
 	}
-	tunnel->paths[TB_USB3_PATH_UP] = path;
-	tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_UP]);
+	tunnel->paths[TB_USB3_PATH_DOWN] = path;
+	tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_DOWN]);
 
 	path = tb_path_discover(tunnel->dst_port, -1, down, TB_USB3_HOPID, NULL,
-				"USB3 Down");
+				"USB3 Up");
 	if (!path)
 		goto err_deactivate;
-	tunnel->paths[TB_USB3_PATH_DOWN] = path;
-	tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_DOWN]);
+	tunnel->paths[TB_USB3_PATH_UP] = path;
+	tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_UP]);
 
 	/* Validate that the tunnel is complete */
 	if (!tb_port_is_usb3_up(tunnel->dst_port)) {